./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Fibonacci03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version e04fb08f Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Fibonacci03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash be0a584ba9648c80e7a0523ff51ba530f1926c55cecd3c62f2cee05fbbff42e3 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-e04fb08 [2022-11-16 20:15:31,214 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 20:15:31,217 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 20:15:31,255 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 20:15:31,255 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 20:15:31,259 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 20:15:31,262 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 20:15:31,265 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 20:15:31,268 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 20:15:31,273 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 20:15:31,274 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 20:15:31,277 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 20:15:31,277 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 20:15:31,280 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 20:15:31,281 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 20:15:31,283 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 20:15:31,284 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 20:15:31,285 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 20:15:31,287 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 20:15:31,295 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 20:15:31,296 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 20:15:31,297 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 20:15:31,300 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 20:15:31,301 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 20:15:31,309 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 20:15:31,309 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 20:15:31,310 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 20:15:31,311 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 20:15:31,312 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 20:15:31,313 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 20:15:31,313 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 20:15:31,314 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 20:15:31,316 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 20:15:31,317 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 20:15:31,319 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 20:15:31,320 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 20:15:31,321 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 20:15:31,321 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 20:15:31,321 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 20:15:31,322 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 20:15:31,323 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 20:15:31,324 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/config/svcomp-Overflow-32bit-Taipan_Default.epf [2022-11-16 20:15:31,363 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 20:15:31,364 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 20:15:31,365 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 20:15:31,372 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 20:15:31,373 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 20:15:31,374 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 20:15:31,374 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 20:15:31,374 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 20:15:31,375 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 20:15:31,375 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 20:15:31,376 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 20:15:31,377 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 20:15:31,377 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 20:15:31,377 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 20:15:31,378 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 20:15:31,378 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 20:15:31,378 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 20:15:31,379 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 20:15:31,379 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 20:15:31,380 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 20:15:31,380 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-16 20:15:31,380 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 20:15:31,381 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 20:15:31,381 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 20:15:31,381 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 20:15:31,382 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 20:15:31,382 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 20:15:31,384 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2022-11-16 20:15:31,384 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 20:15:31,385 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 20:15:31,385 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 20:15:31,385 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 20:15:31,386 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 20:15:31,386 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 20:15:31,387 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:15:31,387 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 20:15:31,387 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 20:15:31,387 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 20:15:31,388 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 20:15:31,388 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 20:15:31,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 20:15:31,389 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 20:15:31,389 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 20:15:31,389 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be0a584ba9648c80e7a0523ff51ba530f1926c55cecd3c62f2cee05fbbff42e3 [2022-11-16 20:15:31,728 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 20:15:31,765 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 20:15:31,768 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 20:15:31,769 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 20:15:31,770 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 20:15:31,771 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/recursive/Fibonacci03.c [2022-11-16 20:15:31,831 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/data/11ee8c61b/662796c35e5f4b829932310ef42d9f40/FLAGd2867fa1f [2022-11-16 20:15:32,271 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 20:15:32,271 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/sv-benchmarks/c/recursive/Fibonacci03.c [2022-11-16 20:15:32,276 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/data/11ee8c61b/662796c35e5f4b829932310ef42d9f40/FLAGd2867fa1f [2022-11-16 20:15:32,655 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/data/11ee8c61b/662796c35e5f4b829932310ef42d9f40 [2022-11-16 20:15:32,658 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 20:15:32,659 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 20:15:32,661 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 20:15:32,661 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 20:15:32,664 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 20:15:32,665 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,666 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17645efe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32, skipping insertion in model container [2022-11-16 20:15:32,666 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,673 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 20:15:32,702 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 20:15:32,913 WARN L229 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_316d79a7-555a-4567-843d-8a33481ad0c3/sv-benchmarks/c/recursive/Fibonacci03.c[788,801] [2022-11-16 20:15:32,914 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:15:32,925 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 20:15:32,936 WARN L229 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_316d79a7-555a-4567-843d-8a33481ad0c3/sv-benchmarks/c/recursive/Fibonacci03.c[788,801] [2022-11-16 20:15:32,936 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 20:15:32,949 INFO L208 MainTranslator]: Completed translation [2022-11-16 20:15:32,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32 WrapperNode [2022-11-16 20:15:32,950 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 20:15:32,951 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 20:15:32,951 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 20:15:32,951 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 20:15:32,959 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,967 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,982 INFO L138 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 26 [2022-11-16 20:15:32,983 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 20:15:32,984 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 20:15:32,984 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 20:15:32,984 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 20:15:32,993 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,993 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,994 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,995 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,997 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:32,999 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:33,000 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:33,001 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:33,002 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 20:15:33,003 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 20:15:33,003 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 20:15:33,003 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 20:15:33,004 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (1/1) ... [2022-11-16 20:15:33,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 20:15:33,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:33,036 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 20:15:33,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 20:15:33,083 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2022-11-16 20:15:33,083 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2022-11-16 20:15:33,083 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 20:15:33,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 20:15:33,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 20:15:33,084 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 20:15:33,153 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 20:15:33,155 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 20:15:33,374 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 20:15:33,409 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 20:15:33,409 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-16 20:15:33,411 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:15:33 BoogieIcfgContainer [2022-11-16 20:15:33,412 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 20:15:33,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 20:15:33,414 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 20:15:33,420 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 20:15:33,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 08:15:32" (1/3) ... [2022-11-16 20:15:33,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@318c0e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:15:33, skipping insertion in model container [2022-11-16 20:15:33,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 08:15:32" (2/3) ... [2022-11-16 20:15:33,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@318c0e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 08:15:33, skipping insertion in model container [2022-11-16 20:15:33,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 08:15:33" (3/3) ... [2022-11-16 20:15:33,424 INFO L112 eAbstractionObserver]: Analyzing ICFG Fibonacci03.c [2022-11-16 20:15:33,442 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 20:15:33,443 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2022-11-16 20:15:33,513 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 20:15:33,521 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1e5467ff, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 20:15:33,522 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2022-11-16 20:15:33,530 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 20:15:33,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-16 20:15:33,539 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:33,540 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:33,541 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:33,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:33,549 INFO L85 PathProgramCache]: Analyzing trace with hash 1639303625, now seen corresponding path program 1 times [2022-11-16 20:15:33,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:33,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282255001] [2022-11-16 20:15:33,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:33,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:33,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:33,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:33,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:33,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282255001] [2022-11-16 20:15:33,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282255001] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:15:33,838 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:15:33,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:15:33,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905822307] [2022-11-16 20:15:33,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:15:33,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:15:33,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:33,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:15:33,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:15:33,874 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:34,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:34,037 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2022-11-16 20:15:34,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:15:34,045 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-16 20:15:34,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:34,061 INFO L225 Difference]: With dead ends: 29 [2022-11-16 20:15:34,066 INFO L226 Difference]: Without dead ends: 22 [2022-11-16 20:15:34,071 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-16 20:15:34,078 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:34,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 23 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:15:34,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-16 20:15:34,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-16 20:15:34,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:15:34,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2022-11-16 20:15:34,166 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 7 [2022-11-16 20:15:34,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:34,167 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2022-11-16 20:15:34,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:34,167 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2022-11-16 20:15:34,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-16 20:15:34,168 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:34,169 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:34,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 20:15:34,169 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:34,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:34,170 INFO L85 PathProgramCache]: Analyzing trace with hash -721195135, now seen corresponding path program 1 times [2022-11-16 20:15:34,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:34,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104804258] [2022-11-16 20:15:34,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:34,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:34,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:34,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-16 20:15:34,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:34,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104804258] [2022-11-16 20:15:34,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104804258] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:15:34,226 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:15:34,226 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-16 20:15:34,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304860237] [2022-11-16 20:15:34,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:15:34,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-16 20:15:34,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:34,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-16 20:15:34,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:15:34,230 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:34,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:34,275 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2022-11-16 20:15:34,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-16 20:15:34,283 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-16 20:15:34,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:34,286 INFO L225 Difference]: With dead ends: 24 [2022-11-16 20:15:34,286 INFO L226 Difference]: Without dead ends: 22 [2022-11-16 20:15:34,286 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-16 20:15:34,288 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 11 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:34,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 20 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:15:34,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-16 20:15:34,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2022-11-16 20:15:34,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:15:34,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-11-16 20:15:34,299 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 8 [2022-11-16 20:15:34,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:34,301 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-11-16 20:15:34,302 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 20:15:34,302 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-11-16 20:15:34,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-16 20:15:34,305 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:34,305 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:34,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-16 20:15:34,306 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:34,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:34,316 INFO L85 PathProgramCache]: Analyzing trace with hash -5479895, now seen corresponding path program 1 times [2022-11-16 20:15:34,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:34,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465546718] [2022-11-16 20:15:34,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:34,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:34,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:34,500 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-16 20:15:34,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:34,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465546718] [2022-11-16 20:15:34,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [465546718] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:15:34,500 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:15:34,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:15:34,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614716353] [2022-11-16 20:15:34,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:15:34,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:15:34,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:34,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:15:34,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:15:34,503 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:15:34,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:34,551 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-11-16 20:15:34,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:15:34,552 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2022-11-16 20:15:34,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:34,553 INFO L225 Difference]: With dead ends: 36 [2022-11-16 20:15:34,553 INFO L226 Difference]: Without dead ends: 34 [2022-11-16 20:15:34,553 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:15:34,555 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 7 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:34,555 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 48 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:15:34,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-16 20:15:34,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2022-11-16 20:15:34,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-16 20:15:34,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2022-11-16 20:15:34,564 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 29 [2022-11-16 20:15:34,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:34,565 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2022-11-16 20:15:34,565 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:15:34,565 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2022-11-16 20:15:34,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-16 20:15:34,566 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:34,567 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:34,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-16 20:15:34,567 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:34,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:34,568 INFO L85 PathProgramCache]: Analyzing trace with hash -158558097, now seen corresponding path program 1 times [2022-11-16 20:15:34,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:34,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111818192] [2022-11-16 20:15:34,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:34,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:34,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:34,757 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-16 20:15:34,757 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:34,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111818192] [2022-11-16 20:15:34,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111818192] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:34,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482108673] [2022-11-16 20:15:34,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:34,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:34,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:34,762 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:34,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 20:15:34,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:34,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-16 20:15:34,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:34,979 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:15:34,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:35,216 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-16 20:15:35,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482108673] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:35,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [558401901] [2022-11-16 20:15:35,245 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-16 20:15:35,245 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:35,250 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:35,261 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:35,261 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2022-11-16 20:15:35,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68217103] [2022-11-16 20:15:35,262 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:35,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-16 20:15:35,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:35,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-16 20:15:35,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-16 20:15:35,269 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-16 20:15:35,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:35,627 INFO L93 Difference]: Finished difference Result 90 states and 128 transitions. [2022-11-16 20:15:35,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-16 20:15:35,627 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 30 [2022-11-16 20:15:35,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:35,629 INFO L225 Difference]: With dead ends: 90 [2022-11-16 20:15:35,629 INFO L226 Difference]: Without dead ends: 64 [2022-11-16 20:15:35,631 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2022-11-16 20:15:35,632 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 138 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:35,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 66 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:15:35,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-16 20:15:35,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2022-11-16 20:15:35,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.105263157894737) internal successors, (42), 41 states have internal predecessors, (42), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-16 20:15:35,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-11-16 20:15:35,647 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 30 [2022-11-16 20:15:35,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:35,647 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-11-16 20:15:35,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 15 states have internal predecessors, (36), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-16 20:15:35,648 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-11-16 20:15:35,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-16 20:15:35,649 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:35,649 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:35,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:35,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:35,854 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:35,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:35,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1851648215, now seen corresponding path program 2 times [2022-11-16 20:15:35,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:35,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040036425] [2022-11-16 20:15:35,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:35,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:35,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:35,944 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:15:35,944 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:35,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040036425] [2022-11-16 20:15:35,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040036425] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:35,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016780125] [2022-11-16 20:15:35,945 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:15:35,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:35,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:35,946 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:35,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 20:15:36,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-16 20:15:36,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:36,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-16 20:15:36,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:36,091 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:15:36,091 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-16 20:15:36,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016780125] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:15:36,091 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-16 20:15:36,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2022-11-16 20:15:36,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453634377] [2022-11-16 20:15:36,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:15:36,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:15:36,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:36,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:15:36,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-11-16 20:15:36,094 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:15:36,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:36,148 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2022-11-16 20:15:36,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:15:36,148 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2022-11-16 20:15:36,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:36,154 INFO L225 Difference]: With dead ends: 60 [2022-11-16 20:15:36,155 INFO L226 Difference]: Without dead ends: 59 [2022-11-16 20:15:36,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-11-16 20:15:36,160 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 9 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:36,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 43 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:15:36,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-16 20:15:36,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2022-11-16 20:15:36,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (18), 9 states have call predecessors, (18), 6 states have call successors, (18) [2022-11-16 20:15:36,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2022-11-16 20:15:36,188 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 24 [2022-11-16 20:15:36,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:36,188 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2022-11-16 20:15:36,188 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-16 20:15:36,189 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2022-11-16 20:15:36,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-16 20:15:36,189 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:36,190 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:36,195 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-16 20:15:36,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:36,390 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:36,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:36,391 INFO L85 PathProgramCache]: Analyzing trace with hash -1566519763, now seen corresponding path program 1 times [2022-11-16 20:15:36,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:36,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141402053] [2022-11-16 20:15:36,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:36,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:36,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:36,520 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:15:36,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:36,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141402053] [2022-11-16 20:15:36,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141402053] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:36,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331839227] [2022-11-16 20:15:36,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:36,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:36,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:36,522 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:36,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 20:15:36,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:36,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-16 20:15:36,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:36,645 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:15:36,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:36,731 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-16 20:15:36,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331839227] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:36,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [863904990] [2022-11-16 20:15:36,739 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:36,739 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:36,740 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:36,741 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:36,741 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2022-11-16 20:15:36,741 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428017775] [2022-11-16 20:15:36,742 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:36,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-16 20:15:36,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:36,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-16 20:15:36,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-11-16 20:15:36,745 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-16 20:15:36,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:36,877 INFO L93 Difference]: Finished difference Result 69 states and 93 transitions. [2022-11-16 20:15:36,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-16 20:15:36,879 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 25 [2022-11-16 20:15:36,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:36,884 INFO L225 Difference]: With dead ends: 69 [2022-11-16 20:15:36,885 INFO L226 Difference]: Without dead ends: 68 [2022-11-16 20:15:36,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-11-16 20:15:36,889 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:36,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 117 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:15:36,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-16 20:15:36,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2022-11-16 20:15:36,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 50 states have (on average 1.1) internal successors, (55), 51 states have internal predecessors, (55), 8 states have call successors, (8), 2 states have call predecessors, (8), 6 states have return successors, (27), 12 states have call predecessors, (27), 7 states have call successors, (27) [2022-11-16 20:15:36,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 90 transitions. [2022-11-16 20:15:36,916 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 90 transitions. Word has length 25 [2022-11-16 20:15:36,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:36,917 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 90 transitions. [2022-11-16 20:15:36,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 12 states have internal predecessors, (35), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-16 20:15:36,918 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 90 transitions. [2022-11-16 20:15:36,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-16 20:15:36,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:36,926 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 20:15:36,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:37,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:37,127 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:37,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:37,127 INFO L85 PathProgramCache]: Analyzing trace with hash 824601704, now seen corresponding path program 1 times [2022-11-16 20:15:37,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:37,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674619799] [2022-11-16 20:15:37,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:37,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:37,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:37,302 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-16 20:15:37,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:37,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674619799] [2022-11-16 20:15:37,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674619799] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:37,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942431714] [2022-11-16 20:15:37,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:37,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:37,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:37,307 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:37,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 20:15:37,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:37,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-16 20:15:37,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:37,455 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-16 20:15:37,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:37,667 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-16 20:15:37,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942431714] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:37,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1316878914] [2022-11-16 20:15:37,670 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:37,670 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:37,670 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:37,671 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:37,671 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 15 [2022-11-16 20:15:37,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492443117] [2022-11-16 20:15:37,671 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:37,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-16 20:15:37,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:37,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-16 20:15:37,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-11-16 20:15:37,673 INFO L87 Difference]: Start difference. First operand 66 states and 90 transitions. Second operand has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2022-11-16 20:15:37,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:37,926 INFO L93 Difference]: Finished difference Result 134 states and 199 transitions. [2022-11-16 20:15:37,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-16 20:15:37,927 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) Word has length 50 [2022-11-16 20:15:37,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:37,935 INFO L225 Difference]: With dead ends: 134 [2022-11-16 20:15:37,937 INFO L226 Difference]: Without dead ends: 133 [2022-11-16 20:15:37,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2022-11-16 20:15:37,942 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 59 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:37,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 103 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:15:37,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-11-16 20:15:37,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 98. [2022-11-16 20:15:37,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-16 20:15:37,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2022-11-16 20:15:37,980 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 50 [2022-11-16 20:15:37,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:37,981 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2022-11-16 20:15:37,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 16 states have internal predecessors, (41), 4 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (9), 9 states have call predecessors, (9), 4 states have call successors, (9) [2022-11-16 20:15:37,981 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2022-11-16 20:15:37,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-16 20:15:37,987 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:37,987 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2022-11-16 20:15:38,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:38,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:38,199 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:38,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:38,199 INFO L85 PathProgramCache]: Analyzing trace with hash -253469865, now seen corresponding path program 1 times [2022-11-16 20:15:38,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:38,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046236302] [2022-11-16 20:15:38,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:38,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:38,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:38,340 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2022-11-16 20:15:38,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:38,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046236302] [2022-11-16 20:15:38,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2046236302] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:15:38,340 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:15:38,340 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:15:38,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143196949] [2022-11-16 20:15:38,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:15:38,341 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:15:38,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:38,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:15:38,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:15:38,342 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-16 20:15:38,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:38,387 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2022-11-16 20:15:38,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:15:38,388 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 69 [2022-11-16 20:15:38,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:38,389 INFO L225 Difference]: With dead ends: 111 [2022-11-16 20:15:38,390 INFO L226 Difference]: Without dead ends: 110 [2022-11-16 20:15:38,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:15:38,391 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 5 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:38,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 53 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:15:38,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-16 20:15:38,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2022-11-16 20:15:38,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-16 20:15:38,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2022-11-16 20:15:38,410 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 69 [2022-11-16 20:15:38,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:38,410 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2022-11-16 20:15:38,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-16 20:15:38,410 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2022-11-16 20:15:38,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-16 20:15:38,412 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:38,412 INFO L195 NwaCegarLoop]: trace histogram [11, 9, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1] [2022-11-16 20:15:38,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-16 20:15:38,412 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:38,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:38,413 INFO L85 PathProgramCache]: Analyzing trace with hash 567329933, now seen corresponding path program 2 times [2022-11-16 20:15:38,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:38,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111790870] [2022-11-16 20:15:38,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:38,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:38,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:38,511 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-11-16 20:15:38,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:38,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111790870] [2022-11-16 20:15:38,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111790870] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 20:15:38,512 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 20:15:38,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-16 20:15:38,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348307081] [2022-11-16 20:15:38,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 20:15:38,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 20:15:38,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:38,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 20:15:38,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:15:38,513 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-16 20:15:38,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:38,549 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2022-11-16 20:15:38,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 20:15:38,550 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 98 [2022-11-16 20:15:38,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:38,553 INFO L225 Difference]: With dead ends: 111 [2022-11-16 20:15:38,553 INFO L226 Difference]: Without dead ends: 110 [2022-11-16 20:15:38,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-16 20:15:38,556 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:38,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 55 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 20:15:38,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-16 20:15:38,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2022-11-16 20:15:38,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 76 states have (on average 1.0789473684210527) internal successors, (82), 75 states have internal predecessors, (82), 11 states have call successors, (11), 2 states have call predecessors, (11), 9 states have return successors, (66), 20 states have call predecessors, (66), 10 states have call successors, (66) [2022-11-16 20:15:38,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 159 transitions. [2022-11-16 20:15:38,593 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 159 transitions. Word has length 98 [2022-11-16 20:15:38,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:38,596 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 159 transitions. [2022-11-16 20:15:38,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-16 20:15:38,596 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 159 transitions. [2022-11-16 20:15:38,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-11-16 20:15:38,602 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:38,603 INFO L195 NwaCegarLoop]: trace histogram [14, 12, 11, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2022-11-16 20:15:38,603 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-16 20:15:38,603 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:38,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:38,604 INFO L85 PathProgramCache]: Analyzing trace with hash 1849402008, now seen corresponding path program 2 times [2022-11-16 20:15:38,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:38,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496840531] [2022-11-16 20:15:38,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:38,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:38,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:38,883 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 68 proven. 165 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2022-11-16 20:15:38,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:38,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496840531] [2022-11-16 20:15:38,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496840531] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:38,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144480308] [2022-11-16 20:15:38,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:15:38,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:38,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:38,885 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:38,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 20:15:38,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-16 20:15:38,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:38,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 20:15:38,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:39,097 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 198 proven. 85 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2022-11-16 20:15:39,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:39,642 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 198 proven. 88 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2022-11-16 20:15:39,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144480308] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:39,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [471504753] [2022-11-16 20:15:39,647 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:39,647 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:39,647 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:39,648 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:39,648 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 19 [2022-11-16 20:15:39,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850001064] [2022-11-16 20:15:39,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:39,649 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-16 20:15:39,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:39,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-16 20:15:39,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-11-16 20:15:39,650 INFO L87 Difference]: Start difference. First operand 98 states and 159 transitions. Second operand has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) [2022-11-16 20:15:40,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:40,055 INFO L93 Difference]: Finished difference Result 175 states and 303 transitions. [2022-11-16 20:15:40,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 20:15:40,056 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) Word has length 128 [2022-11-16 20:15:40,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:40,057 INFO L225 Difference]: With dead ends: 175 [2022-11-16 20:15:40,057 INFO L226 Difference]: Without dead ends: 80 [2022-11-16 20:15:40,059 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 248 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=254, Invalid=676, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:15:40,060 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 244 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:40,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 75 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:15:40,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-16 20:15:40,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2022-11-16 20:15:40,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 55 states have internal predecessors, (62), 8 states have call successors, (8), 5 states have call predecessors, (8), 6 states have return successors, (17), 11 states have call predecessors, (17), 7 states have call successors, (17) [2022-11-16 20:15:40,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2022-11-16 20:15:40,067 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 128 [2022-11-16 20:15:40,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:40,067 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2022-11-16 20:15:40,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.894736842105263) internal successors, (93), 19 states have internal predecessors, (93), 10 states have call successors, (15), 1 states have call predecessors, (15), 8 states have return successors, (18), 11 states have call predecessors, (18), 10 states have call successors, (18) [2022-11-16 20:15:40,068 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2022-11-16 20:15:40,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-16 20:15:40,069 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:40,069 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-11-16 20:15:40,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:40,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-16 20:15:40,274 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:40,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:40,274 INFO L85 PathProgramCache]: Analyzing trace with hash 648182430, now seen corresponding path program 3 times [2022-11-16 20:15:40,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:40,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837117534] [2022-11-16 20:15:40,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:40,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:40,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:40,450 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 81 proven. 48 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-16 20:15:40,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:40,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837117534] [2022-11-16 20:15:40,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837117534] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:40,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856938979] [2022-11-16 20:15:40,451 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:15:40,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:40,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:40,452 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:40,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 20:15:40,514 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:15:40,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:40,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 20:15:40,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:40,599 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 123 proven. 37 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2022-11-16 20:15:40,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:41,124 INFO L134 CoverageAnalysis]: Checked inductivity of 213 backedges. 88 proven. 62 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2022-11-16 20:15:41,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856938979] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:41,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [574719036] [2022-11-16 20:15:41,128 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:41,128 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:41,128 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:41,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:41,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 11] total 16 [2022-11-16 20:15:41,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975043780] [2022-11-16 20:15:41,131 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:41,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-16 20:15:41,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:41,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-16 20:15:41,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2022-11-16 20:15:41,134 INFO L87 Difference]: Start difference. First operand 72 states and 87 transitions. Second operand has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2022-11-16 20:15:41,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:41,348 INFO L93 Difference]: Finished difference Result 131 states and 161 transitions. [2022-11-16 20:15:41,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-16 20:15:41,349 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) Word has length 84 [2022-11-16 20:15:41,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:41,350 INFO L225 Difference]: With dead ends: 131 [2022-11-16 20:15:41,350 INFO L226 Difference]: Without dead ends: 64 [2022-11-16 20:15:41,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 159 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2022-11-16 20:15:41,351 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 70 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:41,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 78 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:15:41,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-16 20:15:41,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-11-16 20:15:41,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.08) internal successors, (54), 49 states have internal predecessors, (54), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2022-11-16 20:15:41,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2022-11-16 20:15:41,357 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 84 [2022-11-16 20:15:41,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:41,357 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2022-11-16 20:15:41,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.9375) internal successors, (79), 16 states have internal predecessors, (79), 9 states have call successors, (13), 2 states have call predecessors, (13), 6 states have return successors, (15), 6 states have call predecessors, (15), 9 states have call successors, (15) [2022-11-16 20:15:41,358 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2022-11-16 20:15:41,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-16 20:15:41,358 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:41,359 INFO L195 NwaCegarLoop]: trace histogram [10, 8, 8, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1] [2022-11-16 20:15:41,369 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:41,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-16 20:15:41,559 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting fibonacciErr5ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:41,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:41,560 INFO L85 PathProgramCache]: Analyzing trace with hash -935145530, now seen corresponding path program 3 times [2022-11-16 20:15:41,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:41,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756243383] [2022-11-16 20:15:41,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:41,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:41,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:41,885 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 14 proven. 67 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2022-11-16 20:15:41,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:41,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756243383] [2022-11-16 20:15:41,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756243383] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:41,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563788885] [2022-11-16 20:15:41,886 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:15:41,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:41,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:41,887 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:41,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-16 20:15:41,961 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:15:41,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:41,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 20:15:41,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:42,054 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2022-11-16 20:15:42,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:42,279 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 62 proven. 5 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2022-11-16 20:15:42,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563788885] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:42,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007568193] [2022-11-16 20:15:42,285 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:42,285 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:42,285 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:42,286 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:42,286 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 18 [2022-11-16 20:15:42,287 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272639020] [2022-11-16 20:15:42,287 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:42,288 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-16 20:15:42,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:42,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-16 20:15:42,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2022-11-16 20:15:42,289 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-16 20:15:42,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:42,423 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2022-11-16 20:15:42,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-16 20:15:42,423 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) Word has length 90 [2022-11-16 20:15:42,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:42,424 INFO L225 Difference]: With dead ends: 68 [2022-11-16 20:15:42,424 INFO L226 Difference]: Without dead ends: 67 [2022-11-16 20:15:42,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 176 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2022-11-16 20:15:42,425 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 22 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:42,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 190 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 20:15:42,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-16 20:15:42,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2022-11-16 20:15:42,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 50 states have (on average 1.06) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2022-11-16 20:15:42,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2022-11-16 20:15:42,431 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 90 [2022-11-16 20:15:42,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:42,432 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2022-11-16 20:15:42,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.388888888888889) internal successors, (61), 19 states have internal predecessors, (61), 6 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 11 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-16 20:15:42,432 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2022-11-16 20:15:42,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-16 20:15:42,434 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:42,434 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 1, 1, 1, 1] [2022-11-16 20:15:42,445 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-16 20:15:42,639 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:42,639 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:42,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:42,640 INFO L85 PathProgramCache]: Analyzing trace with hash -30271424, now seen corresponding path program 4 times [2022-11-16 20:15:42,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:42,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934384646] [2022-11-16 20:15:42,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:42,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:42,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:42,898 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 142 proven. 168 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2022-11-16 20:15:42,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:42,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934384646] [2022-11-16 20:15:42,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934384646] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:42,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651395051] [2022-11-16 20:15:42,899 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:15:42,899 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:42,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:42,900 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:42,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-16 20:15:42,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:42,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-16 20:15:42,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:43,126 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 138 proven. 182 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2022-11-16 20:15:43,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:43,961 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 138 proven. 202 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2022-11-16 20:15:43,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651395051] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:43,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2075357206] [2022-11-16 20:15:43,963 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:43,963 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:43,964 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:43,964 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:43,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 15] total 20 [2022-11-16 20:15:43,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417788552] [2022-11-16 20:15:43,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:43,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-16 20:15:43,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:43,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-16 20:15:43,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2022-11-16 20:15:43,967 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) [2022-11-16 20:15:44,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:44,318 INFO L93 Difference]: Finished difference Result 130 states and 155 transitions. [2022-11-16 20:15:44,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-16 20:15:44,318 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) Word has length 122 [2022-11-16 20:15:44,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:44,319 INFO L225 Difference]: With dead ends: 130 [2022-11-16 20:15:44,320 INFO L226 Difference]: Without dead ends: 72 [2022-11-16 20:15:44,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 233 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2022-11-16 20:15:44,321 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 135 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:44,321 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 98 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:15:44,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-16 20:15:44,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2022-11-16 20:15:44,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 53 states have internal predecessors, (58), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2022-11-16 20:15:44,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 79 transitions. [2022-11-16 20:15:44,328 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 79 transitions. Word has length 122 [2022-11-16 20:15:44,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:44,330 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 79 transitions. [2022-11-16 20:15:44,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 4.85) internal successors, (97), 20 states have internal predecessors, (97), 13 states have call successors, (16), 1 states have call predecessors, (16), 7 states have return successors, (18), 8 states have call predecessors, (18), 13 states have call successors, (18) [2022-11-16 20:15:44,330 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 79 transitions. [2022-11-16 20:15:44,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2022-11-16 20:15:44,334 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:44,335 INFO L195 NwaCegarLoop]: trace histogram [30, 27, 24, 15, 15, 15, 15, 14, 14, 14, 14, 14, 13, 13, 12, 12, 9, 6, 1, 1, 1, 1] [2022-11-16 20:15:44,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:44,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-16 20:15:44,545 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:44,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:44,546 INFO L85 PathProgramCache]: Analyzing trace with hash 140047856, now seen corresponding path program 5 times [2022-11-16 20:15:44,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:44,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980868669] [2022-11-16 20:15:44,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:44,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:44,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:45,159 INFO L134 CoverageAnalysis]: Checked inductivity of 2749 backedges. 224 proven. 971 refuted. 0 times theorem prover too weak. 1554 trivial. 0 not checked. [2022-11-16 20:15:45,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:45,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980868669] [2022-11-16 20:15:45,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980868669] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:45,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371895935] [2022-11-16 20:15:45,160 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:15:45,160 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:45,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:45,171 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:45,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-16 20:15:45,305 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-16 20:15:45,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:45,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-16 20:15:45,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:45,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2749 backedges. 747 proven. 217 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2022-11-16 20:15:45,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:47,928 INFO L134 CoverageAnalysis]: Checked inductivity of 2749 backedges. 861 proven. 190 refuted. 0 times theorem prover too weak. 1698 trivial. 0 not checked. [2022-11-16 20:15:47,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371895935] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:47,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119168801] [2022-11-16 20:15:47,932 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:47,932 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:47,933 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:47,934 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:47,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 20] total 38 [2022-11-16 20:15:47,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221377176] [2022-11-16 20:15:47,935 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:47,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-16 20:15:47,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:47,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-16 20:15:47,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1214, Unknown=0, NotChecked=0, Total=1406 [2022-11-16 20:15:47,939 INFO L87 Difference]: Start difference. First operand 69 states and 79 transitions. Second operand has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 16 states have call successors, (19), 3 states have call predecessors, (19), 13 states have return successors, (30), 25 states have call predecessors, (30), 14 states have call successors, (30) [2022-11-16 20:15:49,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:49,225 INFO L93 Difference]: Finished difference Result 194 states and 253 transitions. [2022-11-16 20:15:49,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-16 20:15:49,226 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 16 states have call successors, (19), 3 states have call predecessors, (19), 13 states have return successors, (30), 25 states have call predecessors, (30), 14 states have call successors, (30) Word has length 280 [2022-11-16 20:15:49,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:49,227 INFO L225 Difference]: With dead ends: 194 [2022-11-16 20:15:49,227 INFO L226 Difference]: Without dead ends: 130 [2022-11-16 20:15:49,230 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 526 SyntacticMatches, 19 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1771 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=890, Invalid=4366, Unknown=0, NotChecked=0, Total=5256 [2022-11-16 20:15:49,230 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 254 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:49,231 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 89 Invalid, 644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:15:49,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-11-16 20:15:49,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 102. [2022-11-16 20:15:49,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 81 states have (on average 1.037037037037037) internal successors, (84), 79 states have internal predecessors, (84), 12 states have call successors, (12), 8 states have call predecessors, (12), 8 states have return successors, (34), 14 states have call predecessors, (34), 11 states have call successors, (34) [2022-11-16 20:15:49,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 130 transitions. [2022-11-16 20:15:49,242 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 130 transitions. Word has length 280 [2022-11-16 20:15:49,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:49,242 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 130 transitions. [2022-11-16 20:15:49,242 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.5) internal successors, (133), 38 states have internal predecessors, (133), 16 states have call successors, (19), 3 states have call predecessors, (19), 13 states have return successors, (30), 25 states have call predecessors, (30), 14 states have call successors, (30) [2022-11-16 20:15:49,243 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 130 transitions. [2022-11-16 20:15:49,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2022-11-16 20:15:49,248 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:49,248 INFO L195 NwaCegarLoop]: trace histogram [32, 30, 26, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 14, 14, 10, 6, 1, 1, 1, 1] [2022-11-16 20:15:49,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:49,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-16 20:15:49,453 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:49,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:49,454 INFO L85 PathProgramCache]: Analyzing trace with hash 1950560215, now seen corresponding path program 6 times [2022-11-16 20:15:49,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:49,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037296347] [2022-11-16 20:15:49,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:49,454 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:49,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 507 proven. 1076 refuted. 0 times theorem prover too weak. 1685 trivial. 0 not checked. [2022-11-16 20:15:50,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:50,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037296347] [2022-11-16 20:15:50,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037296347] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:50,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84359332] [2022-11-16 20:15:50,152 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:15:50,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:50,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:50,154 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:50,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-16 20:15:50,307 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:15:50,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:50,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-16 20:15:50,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:50,539 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 599 proven. 1181 refuted. 0 times theorem prover too weak. 1488 trivial. 0 not checked. [2022-11-16 20:15:50,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:52,451 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 599 proven. 1253 refuted. 0 times theorem prover too weak. 1416 trivial. 0 not checked. [2022-11-16 20:15:52,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84359332] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:52,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1139163459] [2022-11-16 20:15:52,455 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:52,455 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:52,456 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:52,456 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:52,456 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2022-11-16 20:15:52,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614865703] [2022-11-16 20:15:52,458 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:52,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-16 20:15:52,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:52,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-16 20:15:52,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2022-11-16 20:15:52,461 INFO L87 Difference]: Start difference. First operand 102 states and 130 transitions. Second operand has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2022-11-16 20:15:53,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:53,182 INFO L93 Difference]: Finished difference Result 238 states and 327 transitions. [2022-11-16 20:15:53,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-16 20:15:53,183 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) Word has length 305 [2022-11-16 20:15:53,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:53,185 INFO L225 Difference]: With dead ends: 238 [2022-11-16 20:15:53,185 INFO L226 Difference]: Without dead ends: 141 [2022-11-16 20:15:53,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 595 SyntacticMatches, 11 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=604, Invalid=1748, Unknown=0, NotChecked=0, Total=2352 [2022-11-16 20:15:53,188 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 422 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 264 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 264 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:53,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [422 Valid, 125 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [264 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 20:15:53,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-16 20:15:53,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 128. [2022-11-16 20:15:53,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 99 states have internal predecessors, (108), 15 states have call successors, (15), 11 states have call predecessors, (15), 9 states have return successors, (37), 17 states have call predecessors, (37), 14 states have call successors, (37) [2022-11-16 20:15:53,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 160 transitions. [2022-11-16 20:15:53,198 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 160 transitions. Word has length 305 [2022-11-16 20:15:53,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:53,199 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 160 transitions. [2022-11-16 20:15:53,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2022-11-16 20:15:53,199 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 160 transitions. [2022-11-16 20:15:53,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 576 [2022-11-16 20:15:53,212 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:53,212 INFO L195 NwaCegarLoop]: trace histogram [60, 57, 49, 30, 30, 30, 30, 29, 29, 29, 29, 29, 28, 28, 27, 27, 19, 11, 1, 1, 1, 1] [2022-11-16 20:15:53,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:53,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-16 20:15:53,418 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:53,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:53,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1571931249, now seen corresponding path program 7 times [2022-11-16 20:15:53,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:53,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518443826] [2022-11-16 20:15:53,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:53,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:53,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:54,830 INFO L134 CoverageAnalysis]: Checked inductivity of 11944 backedges. 1134 proven. 2819 refuted. 0 times theorem prover too weak. 7991 trivial. 0 not checked. [2022-11-16 20:15:54,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:54,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518443826] [2022-11-16 20:15:54,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518443826] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:54,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563715518] [2022-11-16 20:15:54,831 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:15:54,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:54,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:54,833 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:54,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-16 20:15:55,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:55,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 1088 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-16 20:15:55,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:55,354 INFO L134 CoverageAnalysis]: Checked inductivity of 11944 backedges. 3186 proven. 2833 refuted. 0 times theorem prover too weak. 5925 trivial. 0 not checked. [2022-11-16 20:15:55,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:15:57,802 INFO L134 CoverageAnalysis]: Checked inductivity of 11944 backedges. 1414 proven. 3337 refuted. 0 times theorem prover too weak. 7193 trivial. 0 not checked. [2022-11-16 20:15:57,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563715518] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:15:57,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [467244065] [2022-11-16 20:15:57,804 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:15:57,805 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:15:57,805 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:15:57,806 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:15:57,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 25] total 30 [2022-11-16 20:15:57,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848204665] [2022-11-16 20:15:57,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:15:57,808 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-16 20:15:57,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:15:57,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-16 20:15:57,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=730, Unknown=0, NotChecked=0, Total=870 [2022-11-16 20:15:57,809 INFO L87 Difference]: Start difference. First operand 128 states and 160 transitions. Second operand has 30 states, 30 states have (on average 5.966666666666667) internal successors, (179), 30 states have internal predecessors, (179), 25 states have call successors, (32), 4 states have call predecessors, (32), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) [2022-11-16 20:15:58,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:15:58,705 INFO L93 Difference]: Finished difference Result 298 states and 410 transitions. [2022-11-16 20:15:58,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-16 20:15:58,706 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.966666666666667) internal successors, (179), 30 states have internal predecessors, (179), 25 states have call successors, (32), 4 states have call predecessors, (32), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) Word has length 575 [2022-11-16 20:15:58,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:15:58,708 INFO L225 Difference]: With dead ends: 298 [2022-11-16 20:15:58,708 INFO L226 Difference]: Without dead ends: 175 [2022-11-16 20:15:58,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1203 GetRequests, 1134 SyntacticMatches, 15 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 737 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=796, Invalid=2284, Unknown=0, NotChecked=0, Total=3080 [2022-11-16 20:15:58,711 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 622 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 384 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 622 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 384 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:15:58,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [622 Valid, 120 Invalid, 716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [384 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:15:58,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-11-16 20:15:58,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 152. [2022-11-16 20:15:58,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 123 states have (on average 1.056910569105691) internal successors, (130), 118 states have internal predecessors, (130), 18 states have call successors, (18), 14 states have call predecessors, (18), 10 states have return successors, (49), 19 states have call predecessors, (49), 17 states have call successors, (49) [2022-11-16 20:15:58,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 197 transitions. [2022-11-16 20:15:58,725 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 197 transitions. Word has length 575 [2022-11-16 20:15:58,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:15:58,726 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 197 transitions. [2022-11-16 20:15:58,726 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.966666666666667) internal successors, (179), 30 states have internal predecessors, (179), 25 states have call successors, (32), 4 states have call predecessors, (32), 12 states have return successors, (37), 14 states have call predecessors, (37), 23 states have call successors, (37) [2022-11-16 20:15:58,727 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 197 transitions. [2022-11-16 20:15:58,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 320 [2022-11-16 20:15:58,733 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:15:58,733 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 27, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 15, 15, 11, 6, 1, 1, 1, 1] [2022-11-16 20:15:58,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-16 20:15:58,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-16 20:15:58,947 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:15:58,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:15:58,948 INFO L85 PathProgramCache]: Analyzing trace with hash 961850664, now seen corresponding path program 8 times [2022-11-16 20:15:58,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:15:58,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441051710] [2022-11-16 20:15:58,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:15:58,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:15:58,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:15:59,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 765 proven. 390 refuted. 0 times theorem prover too weak. 2429 trivial. 0 not checked. [2022-11-16 20:15:59,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:15:59,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441051710] [2022-11-16 20:15:59,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441051710] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:15:59,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784007658] [2022-11-16 20:15:59,510 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:15:59,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:15:59,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:15:59,515 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:15:59,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-16 20:15:59,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-16 20:15:59,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:15:59,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-16 20:15:59,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:15:59,813 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 823 proven. 211 refuted. 0 times theorem prover too weak. 2550 trivial. 0 not checked. [2022-11-16 20:15:59,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:00,661 INFO L134 CoverageAnalysis]: Checked inductivity of 3584 backedges. 823 proven. 226 refuted. 0 times theorem prover too weak. 2535 trivial. 0 not checked. [2022-11-16 20:16:00,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784007658] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:00,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1997840562] [2022-11-16 20:16:00,664 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:16:00,664 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:16:00,665 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:00,666 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:00,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 13] total 20 [2022-11-16 20:16:00,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942781663] [2022-11-16 20:16:00,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:00,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-16 20:16:00,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:00,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-16 20:16:00,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2022-11-16 20:16:00,671 INFO L87 Difference]: Start difference. First operand 152 states and 197 transitions. Second operand has 20 states, 20 states have (on average 5.1) internal successors, (102), 20 states have internal predecessors, (102), 9 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (20), 14 states have call predecessors, (20), 9 states have call successors, (20) [2022-11-16 20:16:01,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:01,102 INFO L93 Difference]: Finished difference Result 291 states and 398 transitions. [2022-11-16 20:16:01,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-16 20:16:01,103 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.1) internal successors, (102), 20 states have internal predecessors, (102), 9 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (20), 14 states have call predecessors, (20), 9 states have call successors, (20) Word has length 319 [2022-11-16 20:16:01,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:01,104 INFO L225 Difference]: With dead ends: 291 [2022-11-16 20:16:01,104 INFO L226 Difference]: Without dead ends: 144 [2022-11-16 20:16:01,106 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 628 SyntacticMatches, 6 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=274, Invalid=656, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:16:01,106 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 148 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:01,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 147 Invalid, 433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 331 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:16:01,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-11-16 20:16:01,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 135. [2022-11-16 20:16:01,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 109 states have (on average 1.0458715596330275) internal successors, (114), 106 states have internal predecessors, (114), 17 states have call successors, (17), 14 states have call predecessors, (17), 8 states have return successors, (38), 14 states have call predecessors, (38), 16 states have call successors, (38) [2022-11-16 20:16:01,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 169 transitions. [2022-11-16 20:16:01,116 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 169 transitions. Word has length 319 [2022-11-16 20:16:01,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:01,117 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 169 transitions. [2022-11-16 20:16:01,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.1) internal successors, (102), 20 states have internal predecessors, (102), 9 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (20), 14 states have call predecessors, (20), 9 states have call successors, (20) [2022-11-16 20:16:01,117 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 169 transitions. [2022-11-16 20:16:01,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2022-11-16 20:16:01,119 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:01,120 INFO L195 NwaCegarLoop]: trace histogram [36, 34, 29, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 16, 16, 11, 7, 1, 1, 1, 1] [2022-11-16 20:16:01,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-16 20:16:01,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-16 20:16:01,325 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:16:01,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:01,326 INFO L85 PathProgramCache]: Analyzing trace with hash 1012331071, now seen corresponding path program 9 times [2022-11-16 20:16:01,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:01,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562939864] [2022-11-16 20:16:01,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:01,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:01,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:01,959 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 764 proven. 1095 refuted. 0 times theorem prover too weak. 2324 trivial. 0 not checked. [2022-11-16 20:16:01,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:01,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562939864] [2022-11-16 20:16:01,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562939864] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:01,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200549782] [2022-11-16 20:16:01,959 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:16:01,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:01,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:01,961 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:01,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-16 20:16:02,167 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:16:02,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:16:02,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-16 20:16:02,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:02,375 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 884 proven. 1214 refuted. 0 times theorem prover too weak. 2085 trivial. 0 not checked. [2022-11-16 20:16:02,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:04,341 INFO L134 CoverageAnalysis]: Checked inductivity of 4183 backedges. 884 proven. 1290 refuted. 0 times theorem prover too weak. 2009 trivial. 0 not checked. [2022-11-16 20:16:04,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1200549782] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:04,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [170120889] [2022-11-16 20:16:04,344 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:16:04,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:16:04,344 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:04,345 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:04,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 28 [2022-11-16 20:16:04,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113317165] [2022-11-16 20:16:04,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:04,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-16 20:16:04,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:04,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-16 20:16:04,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2022-11-16 20:16:04,348 INFO L87 Difference]: Start difference. First operand 135 states and 169 transitions. Second operand has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2022-11-16 20:16:05,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:05,015 INFO L93 Difference]: Finished difference Result 278 states and 363 transitions. [2022-11-16 20:16:05,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-16 20:16:05,016 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) Word has length 344 [2022-11-16 20:16:05,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:05,018 INFO L225 Difference]: With dead ends: 278 [2022-11-16 20:16:05,019 INFO L226 Difference]: Without dead ends: 148 [2022-11-16 20:16:05,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 723 GetRequests, 671 SyntacticMatches, 11 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2022-11-16 20:16:05,021 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 502 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 375 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 502 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 375 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:05,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [502 Valid, 169 Invalid, 795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [375 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:16:05,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-11-16 20:16:05,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 124. [2022-11-16 20:16:05,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 99 states have (on average 1.0303030303030303) internal successors, (102), 98 states have internal predecessors, (102), 16 states have call successors, (16), 12 states have call predecessors, (16), 8 states have return successors, (35), 13 states have call predecessors, (35), 15 states have call successors, (35) [2022-11-16 20:16:05,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 153 transitions. [2022-11-16 20:16:05,034 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 153 transitions. Word has length 344 [2022-11-16 20:16:05,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:05,035 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 153 transitions. [2022-11-16 20:16:05,036 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.285714285714286) internal successors, (148), 28 states have internal predecessors, (148), 21 states have call successors, (25), 1 states have call predecessors, (25), 11 states have return successors, (32), 13 states have call predecessors, (32), 21 states have call successors, (32) [2022-11-16 20:16:05,036 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 153 transitions. [2022-11-16 20:16:05,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2022-11-16 20:16:05,040 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:05,040 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 33, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 19, 13, 8, 1, 1, 1, 1] [2022-11-16 20:16:05,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-16 20:16:05,245 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-16 20:16:05,246 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:16:05,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:05,246 INFO L85 PathProgramCache]: Analyzing trace with hash 815442872, now seen corresponding path program 10 times [2022-11-16 20:16:05,246 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:05,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546456707] [2022-11-16 20:16:05,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:05,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:05,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:08,473 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 830 proven. 1451 refuted. 0 times theorem prover too weak. 3328 trivial. 0 not checked. [2022-11-16 20:16:08,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:08,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546456707] [2022-11-16 20:16:08,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546456707] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:08,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216883272] [2022-11-16 20:16:08,474 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:16:08,474 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:08,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:08,485 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:08,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-16 20:16:08,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:08,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-16 20:16:08,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:09,276 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 820 proven. 1093 refuted. 0 times theorem prover too weak. 3696 trivial. 0 not checked. [2022-11-16 20:16:09,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:16,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5609 backedges. 1149 proven. 996 refuted. 0 times theorem prover too weak. 3464 trivial. 0 not checked. [2022-11-16 20:16:16,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216883272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:16,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [315300267] [2022-11-16 20:16:16,733 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:16:16,733 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:16:16,734 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:16,735 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:16,735 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 29] total 45 [2022-11-16 20:16:16,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324413514] [2022-11-16 20:16:16,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:16,736 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-16 20:16:16,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:16,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-16 20:16:16,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1607, Unknown=0, NotChecked=0, Total=2070 [2022-11-16 20:16:16,738 INFO L87 Difference]: Start difference. First operand 124 states and 153 transitions. Second operand has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) [2022-11-16 20:16:17,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:17,024 INFO L93 Difference]: Finished difference Result 155 states and 205 transitions. [2022-11-16 20:16:17,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-16 20:16:17,024 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) Word has length 397 [2022-11-16 20:16:17,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:17,026 INFO L225 Difference]: With dead ends: 155 [2022-11-16 20:16:17,027 INFO L226 Difference]: Without dead ends: 154 [2022-11-16 20:16:17,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 877 GetRequests, 778 SyntacticMatches, 51 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2454 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=544, Invalid=1906, Unknown=0, NotChecked=0, Total=2450 [2022-11-16 20:16:17,028 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 58 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:17,029 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 187 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 238 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:16:17,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2022-11-16 20:16:17,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 144. [2022-11-16 20:16:17,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 115 states have (on average 1.0260869565217392) internal successors, (118), 113 states have internal predecessors, (118), 18 states have call successors, (18), 12 states have call predecessors, (18), 10 states have return successors, (55), 18 states have call predecessors, (55), 17 states have call successors, (55) [2022-11-16 20:16:17,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 191 transitions. [2022-11-16 20:16:17,048 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 191 transitions. Word has length 397 [2022-11-16 20:16:17,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:17,049 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 191 transitions. [2022-11-16 20:16:17,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.5555555555555554) internal successors, (115), 46 states have internal predecessors, (115), 12 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (31), 31 states have call predecessors, (31), 12 states have call successors, (31) [2022-11-16 20:16:17,049 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 191 transitions. [2022-11-16 20:16:17,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1223 [2022-11-16 20:16:17,063 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:17,064 INFO L195 NwaCegarLoop]: trace histogram [126, 123, 102, 63, 63, 63, 63, 62, 62, 62, 62, 62, 61, 61, 60, 60, 39, 24, 1, 1, 1, 1] [2022-11-16 20:16:17,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-16 20:16:17,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:17,270 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:16:17,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:17,271 INFO L85 PathProgramCache]: Analyzing trace with hash 427307584, now seen corresponding path program 11 times [2022-11-16 20:16:17,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:17,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718994722] [2022-11-16 20:16:17,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:17,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:17,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:20,496 INFO L134 CoverageAnalysis]: Checked inductivity of 54760 backedges. 2212 proven. 8825 refuted. 0 times theorem prover too weak. 43723 trivial. 0 not checked. [2022-11-16 20:16:20,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:20,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718994722] [2022-11-16 20:16:20,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718994722] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:20,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283926980] [2022-11-16 20:16:20,497 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:16:20,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:20,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:20,504 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:20,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-16 20:16:21,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2022-11-16 20:16:21,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:16:21,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 1564 conjuncts, 165 conjunts are in the unsatisfiable core [2022-11-16 20:16:21,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:22,455 INFO L134 CoverageAnalysis]: Checked inductivity of 54760 backedges. 16340 proven. 4556 refuted. 0 times theorem prover too weak. 33864 trivial. 0 not checked. [2022-11-16 20:16:22,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:16:48,312 INFO L134 CoverageAnalysis]: Checked inductivity of 54760 backedges. 17207 proven. 4221 refuted. 0 times theorem prover too weak. 33332 trivial. 0 not checked. [2022-11-16 20:16:48,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283926980] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:16:48,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1167367889] [2022-11-16 20:16:48,314 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:16:48,315 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:16:48,315 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:16:48,316 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:16:48,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 38] total 65 [2022-11-16 20:16:48,317 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072624455] [2022-11-16 20:16:48,317 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:16:48,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-16 20:16:48,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:16:48,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-16 20:16:48,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=3618, Unknown=0, NotChecked=0, Total=4160 [2022-11-16 20:16:48,321 INFO L87 Difference]: Start difference. First operand 144 states and 191 transitions. Second operand has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) [2022-11-16 20:16:51,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:16:51,311 INFO L93 Difference]: Finished difference Result 395 states and 605 transitions. [2022-11-16 20:16:51,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-16 20:16:51,312 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) Word has length 1222 [2022-11-16 20:16:51,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:16:51,316 INFO L225 Difference]: With dead ends: 395 [2022-11-16 20:16:51,316 INFO L226 Difference]: Without dead ends: 256 [2022-11-16 20:16:51,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2545 GetRequests, 2304 SyntacticMatches, 109 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9128 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2535, Invalid=15287, Unknown=0, NotChecked=0, Total=17822 [2022-11-16 20:16:51,323 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 697 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 1122 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 697 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 1463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 1122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:16:51,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [697 Valid, 142 Invalid, 1463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 1122 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 20:16:51,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-16 20:16:51,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 218. [2022-11-16 20:16:51,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 175 states have (on average 1.0285714285714285) internal successors, (180), 171 states have internal predecessors, (180), 27 states have call successors, (27), 17 states have call predecessors, (27), 15 states have return successors, (108), 29 states have call predecessors, (108), 26 states have call successors, (108) [2022-11-16 20:16:51,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 315 transitions. [2022-11-16 20:16:51,341 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 315 transitions. Word has length 1222 [2022-11-16 20:16:51,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:16:51,342 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 315 transitions. [2022-11-16 20:16:51,343 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.4461538461538463) internal successors, (224), 65 states have internal predecessors, (224), 27 states have call successors, (31), 3 states have call predecessors, (31), 24 states have return successors, (55), 46 states have call predecessors, (55), 25 states have call successors, (55) [2022-11-16 20:16:51,343 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 315 transitions. [2022-11-16 20:16:51,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2047 [2022-11-16 20:16:51,378 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:16:51,379 INFO L195 NwaCegarLoop]: trace histogram [210, 207, 170, 105, 105, 105, 105, 104, 104, 104, 104, 104, 103, 103, 102, 102, 65, 40, 1, 1, 1, 1] [2022-11-16 20:16:51,390 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-16 20:16:51,586 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2022-11-16 20:16:51,586 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:16:51,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:16:51,587 INFO L85 PathProgramCache]: Analyzing trace with hash -1771764176, now seen corresponding path program 12 times [2022-11-16 20:16:51,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:16:51,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247132129] [2022-11-16 20:16:51,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:16:51,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:16:52,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:16:57,589 INFO L134 CoverageAnalysis]: Checked inductivity of 154358 backedges. 5526 proven. 17712 refuted. 0 times theorem prover too weak. 131120 trivial. 0 not checked. [2022-11-16 20:16:57,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:16:57,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247132129] [2022-11-16 20:16:57,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1247132129] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:16:57,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039008270] [2022-11-16 20:16:57,590 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:16:57,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:16:57,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:16:57,591 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:16:57,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-16 20:16:58,459 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:16:58,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:16:58,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 2538 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-16 20:16:58,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:16:58,870 INFO L134 CoverageAnalysis]: Checked inductivity of 154358 backedges. 55058 proven. 14515 refuted. 0 times theorem prover too weak. 84785 trivial. 0 not checked. [2022-11-16 20:16:58,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:17:05,352 INFO L134 CoverageAnalysis]: Checked inductivity of 154358 backedges. 6447 proven. 20190 refuted. 0 times theorem prover too weak. 127721 trivial. 0 not checked. [2022-11-16 20:17:05,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039008270] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:17:05,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1430898663] [2022-11-16 20:17:05,355 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:17:05,355 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:17:05,356 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:17:05,363 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:17:05,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 34] total 39 [2022-11-16 20:17:05,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288153655] [2022-11-16 20:17:05,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:17:05,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-16 20:17:05,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:17:05,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-16 20:17:05,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1251, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 20:17:05,369 INFO L87 Difference]: Start difference. First operand 218 states and 315 transitions. Second operand has 39 states, 39 states have (on average 6.0) internal successors, (234), 39 states have internal predecessors, (234), 34 states have call successors, (41), 3 states have call predecessors, (41), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) [2022-11-16 20:17:06,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:17:06,921 INFO L93 Difference]: Finished difference Result 489 states and 790 transitions. [2022-11-16 20:17:06,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-16 20:17:06,922 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 6.0) internal successors, (234), 39 states have internal predecessors, (234), 34 states have call successors, (41), 3 states have call predecessors, (41), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) Word has length 2046 [2022-11-16 20:17:06,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:17:06,926 INFO L225 Difference]: With dead ends: 489 [2022-11-16 20:17:06,927 INFO L226 Difference]: Without dead ends: 276 [2022-11-16 20:17:06,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4169 GetRequests, 4072 SyntacticMatches, 18 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1697 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1534, Invalid=4946, Unknown=0, NotChecked=0, Total=6480 [2022-11-16 20:17:06,932 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 991 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 844 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 991 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 1664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 844 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:17:06,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [991 Valid, 231 Invalid, 1664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [844 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 20:17:06,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2022-11-16 20:17:06,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 256. [2022-11-16 20:17:06,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 207 states have (on average 1.0338164251207729) internal successors, (214), 201 states have internal predecessors, (214), 32 states have call successors, (32), 22 states have call predecessors, (32), 16 states have return successors, (114), 32 states have call predecessors, (114), 31 states have call successors, (114) [2022-11-16 20:17:06,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 360 transitions. [2022-11-16 20:17:06,952 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 360 transitions. Word has length 2046 [2022-11-16 20:17:06,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:17:06,954 INFO L495 AbstractCegarLoop]: Abstraction has 256 states and 360 transitions. [2022-11-16 20:17:06,954 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 6.0) internal successors, (234), 39 states have internal predecessors, (234), 34 states have call successors, (41), 3 states have call predecessors, (41), 17 states have return successors, (52), 19 states have call predecessors, (52), 33 states have call successors, (52) [2022-11-16 20:17:06,954 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 360 transitions. [2022-11-16 20:17:06,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1124 [2022-11-16 20:17:06,966 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:17:06,966 INFO L195 NwaCegarLoop]: trace histogram [115, 114, 93, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 56, 56, 36, 22, 1, 1, 1, 1] [2022-11-16 20:17:06,983 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-16 20:17:07,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:07,176 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:17:07,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:17:07,176 INFO L85 PathProgramCache]: Analyzing trace with hash -1034719441, now seen corresponding path program 13 times [2022-11-16 20:17:07,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:17:07,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215682517] [2022-11-16 20:17:07,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:17:07,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:17:07,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:17:09,296 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 5612 proven. 2561 refuted. 0 times theorem prover too weak. 38001 trivial. 0 not checked. [2022-11-16 20:17:09,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:17:09,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215682517] [2022-11-16 20:17:09,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215682517] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:17:09,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190920467] [2022-11-16 20:17:09,297 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:17:09,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:09,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:17:09,299 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:17:09,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-16 20:17:10,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:17:10,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 2101 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-16 20:17:10,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:17:10,437 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 25253 proven. 2667 refuted. 0 times theorem prover too weak. 18254 trivial. 0 not checked. [2022-11-16 20:17:10,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:17:15,996 INFO L134 CoverageAnalysis]: Checked inductivity of 46174 backedges. 3245 proven. 8582 refuted. 0 times theorem prover too weak. 34347 trivial. 0 not checked. [2022-11-16 20:17:15,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190920467] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:17:15,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [36642912] [2022-11-16 20:17:15,999 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:17:15,999 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:17:15,999 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:17:16,000 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:17:16,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 27] total 32 [2022-11-16 20:17:16,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719033808] [2022-11-16 20:17:16,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:17:16,004 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-16 20:17:16,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:17:16,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-16 20:17:16,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2022-11-16 20:17:16,006 INFO L87 Difference]: Start difference. First operand 256 states and 360 transitions. Second operand has 32 states, 32 states have (on average 5.875) internal successors, (188), 32 states have internal predecessors, (188), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) [2022-11-16 20:17:16,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:17:16,895 INFO L93 Difference]: Finished difference Result 496 states and 737 transitions. [2022-11-16 20:17:16,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-16 20:17:16,896 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.875) internal successors, (188), 32 states have internal predecessors, (188), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) Word has length 1123 [2022-11-16 20:17:16,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:17:16,901 INFO L225 Difference]: With dead ends: 496 [2022-11-16 20:17:16,901 INFO L226 Difference]: Without dead ends: 245 [2022-11-16 20:17:16,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2286 GetRequests, 2225 SyntacticMatches, 13 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=632, Invalid=1818, Unknown=0, NotChecked=0, Total=2450 [2022-11-16 20:17:16,907 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 323 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 360 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 1104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 360 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 20:17:16,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [323 Valid, 259 Invalid, 1104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [360 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 20:17:16,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2022-11-16 20:17:16,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 209. [2022-11-16 20:17:16,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 169 states have (on average 1.029585798816568) internal successors, (174), 165 states have internal predecessors, (174), 27 states have call successors, (27), 20 states have call predecessors, (27), 12 states have return successors, (79), 23 states have call predecessors, (79), 26 states have call successors, (79) [2022-11-16 20:17:16,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 280 transitions. [2022-11-16 20:17:16,933 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 280 transitions. Word has length 1123 [2022-11-16 20:17:16,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:17:16,935 INFO L495 AbstractCegarLoop]: Abstraction has 209 states and 280 transitions. [2022-11-16 20:17:16,935 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.875) internal successors, (188), 32 states have internal predecessors, (188), 26 states have call successors, (33), 2 states have call predecessors, (33), 14 states have return successors, (44), 16 states have call predecessors, (44), 26 states have call successors, (44) [2022-11-16 20:17:16,936 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 280 transitions. [2022-11-16 20:17:16,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1418 [2022-11-16 20:17:16,967 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:17:16,968 INFO L195 NwaCegarLoop]: trace histogram [145, 144, 117, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 71, 71, 45, 28, 1, 1, 1, 1] [2022-11-16 20:17:16,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-16 20:17:17,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:17,182 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:17:17,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:17:17,182 INFO L85 PathProgramCache]: Analyzing trace with hash 503879832, now seen corresponding path program 14 times [2022-11-16 20:17:17,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:17:17,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369970663] [2022-11-16 20:17:17,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:17:17,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:17:17,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:17:20,229 INFO L134 CoverageAnalysis]: Checked inductivity of 73747 backedges. 7958 proven. 3643 refuted. 0 times theorem prover too weak. 62146 trivial. 0 not checked. [2022-11-16 20:17:20,229 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:17:20,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369970663] [2022-11-16 20:17:20,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369970663] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:17:20,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253596995] [2022-11-16 20:17:20,230 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:17:20,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:20,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:17:20,231 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:17:20,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-16 20:17:21,149 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2022-11-16 20:17:21,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:17:21,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-16 20:17:21,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:17:21,376 INFO L134 CoverageAnalysis]: Checked inductivity of 73747 backedges. 8077 proven. 1646 refuted. 0 times theorem prover too weak. 64024 trivial. 0 not checked. [2022-11-16 20:17:21,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:17:24,592 INFO L134 CoverageAnalysis]: Checked inductivity of 73747 backedges. 8077 proven. 1722 refuted. 0 times theorem prover too weak. 63948 trivial. 0 not checked. [2022-11-16 20:17:24,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253596995] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:17:24,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561479441] [2022-11-16 20:17:24,595 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:17:24,595 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:17:24,595 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:17:24,596 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:17:24,597 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 21] total 31 [2022-11-16 20:17:24,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305071333] [2022-11-16 20:17:24,597 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:17:24,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-16 20:17:24,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:17:24,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-16 20:17:24,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=756, Unknown=0, NotChecked=0, Total=930 [2022-11-16 20:17:24,601 INFO L87 Difference]: Start difference. First operand 209 states and 280 transitions. Second operand has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) [2022-11-16 20:17:25,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:17:25,446 INFO L93 Difference]: Finished difference Result 425 states and 573 transitions. [2022-11-16 20:17:25,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-16 20:17:25,447 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) Word has length 1417 [2022-11-16 20:17:25,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:17:25,450 INFO L225 Difference]: With dead ends: 425 [2022-11-16 20:17:25,450 INFO L226 Difference]: Without dead ends: 221 [2022-11-16 20:17:25,451 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2883 GetRequests, 2819 SyntacticMatches, 10 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 893 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=741, Invalid=2339, Unknown=0, NotChecked=0, Total=3080 [2022-11-16 20:17:25,452 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 418 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 639 mSolverCounterSat, 251 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 251 IncrementalHoareTripleChecker+Valid, 639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 20:17:25,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [418 Valid, 215 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [251 Valid, 639 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 20:17:25,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-11-16 20:17:25,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 189. [2022-11-16 20:17:25,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 153 states have (on average 1.026143790849673) internal successors, (157), 150 states have internal predecessors, (157), 25 states have call successors, (25), 20 states have call predecessors, (25), 10 states have return successors, (52), 18 states have call predecessors, (52), 24 states have call successors, (52) [2022-11-16 20:17:25,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 234 transitions. [2022-11-16 20:17:25,464 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 234 transitions. Word has length 1417 [2022-11-16 20:17:25,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:17:25,465 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 234 transitions. [2022-11-16 20:17:25,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 5.516129032258065) internal successors, (171), 31 states have internal predecessors, (171), 18 states have call successors, (29), 1 states have call predecessors, (29), 15 states have return successors, (41), 23 states have call predecessors, (41), 18 states have call successors, (41) [2022-11-16 20:17:25,465 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 234 transitions. [2022-11-16 20:17:25,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2144 [2022-11-16 20:17:25,501 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:17:25,502 INFO L195 NwaCegarLoop]: trace histogram [219, 218, 177, 109, 109, 109, 109, 109, 109, 109, 109, 109, 109, 109, 108, 108, 68, 42, 1, 1, 1, 1] [2022-11-16 20:17:25,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-16 20:17:25,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:25,710 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:17:25,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:17:25,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1652237569, now seen corresponding path program 15 times [2022-11-16 20:17:25,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:17:25,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411529016] [2022-11-16 20:17:25,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:17:25,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:17:26,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:17:32,567 INFO L134 CoverageAnalysis]: Checked inductivity of 169376 backedges. 8534 proven. 19696 refuted. 0 times theorem prover too weak. 141146 trivial. 0 not checked. [2022-11-16 20:17:32,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:17:32,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411529016] [2022-11-16 20:17:32,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411529016] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:17:32,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084051590] [2022-11-16 20:17:32,567 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:17:32,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:32,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:17:32,568 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:17:32,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-16 20:17:33,555 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:17:33,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:17:33,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 2654 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-16 20:17:33,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:17:33,957 INFO L134 CoverageAnalysis]: Checked inductivity of 169376 backedges. 9753 proven. 20851 refuted. 0 times theorem prover too weak. 138772 trivial. 0 not checked. [2022-11-16 20:17:33,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:17:42,436 INFO L134 CoverageAnalysis]: Checked inductivity of 169376 backedges. 9753 proven. 21155 refuted. 0 times theorem prover too weak. 138468 trivial. 0 not checked. [2022-11-16 20:17:42,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084051590] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:17:42,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1250778424] [2022-11-16 20:17:42,439 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:17:42,439 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:17:42,440 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:17:42,441 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:17:42,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 39] total 44 [2022-11-16 20:17:42,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483087676] [2022-11-16 20:17:42,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:17:42,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-16 20:17:42,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:17:42,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-16 20:17:42,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=1594, Unknown=0, NotChecked=0, Total=1892 [2022-11-16 20:17:42,446 INFO L87 Difference]: Start difference. First operand 189 states and 234 transitions. Second operand has 44 states, 44 states have (on average 5.545454545454546) internal successors, (244), 44 states have internal predecessors, (244), 37 states have call successors, (41), 1 states have call predecessors, (41), 19 states have return successors, (56), 21 states have call predecessors, (56), 37 states have call successors, (56) [2022-11-16 20:17:44,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:17:44,045 INFO L93 Difference]: Finished difference Result 440 states and 613 transitions. [2022-11-16 20:17:44,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-16 20:17:44,046 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.545454545454546) internal successors, (244), 44 states have internal predecessors, (244), 37 states have call successors, (41), 1 states have call predecessors, (41), 19 states have return successors, (56), 21 states have call predecessors, (56), 37 states have call successors, (56) Word has length 2143 [2022-11-16 20:17:44,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:17:44,049 INFO L225 Difference]: With dead ends: 440 [2022-11-16 20:17:44,049 INFO L226 Difference]: Without dead ends: 256 [2022-11-16 20:17:44,052 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4365 GetRequests, 4263 SyntacticMatches, 19 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1908 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1676, Invalid=5464, Unknown=0, NotChecked=0, Total=7140 [2022-11-16 20:17:44,052 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 861 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 998 mSolverCounterSat, 777 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 861 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 1775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 777 IncrementalHoareTripleChecker+Valid, 998 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:17:44,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [861 Valid, 270 Invalid, 1775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [777 Valid, 998 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 20:17:44,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-16 20:17:44,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 216. [2022-11-16 20:17:44,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 175 states have (on average 1.0285714285714285) internal successors, (180), 172 states have internal predecessors, (180), 29 states have call successors, (29), 23 states have call predecessors, (29), 11 states have return successors, (77), 20 states have call predecessors, (77), 28 states have call successors, (77) [2022-11-16 20:17:44,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 286 transitions. [2022-11-16 20:17:44,069 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 286 transitions. Word has length 2143 [2022-11-16 20:17:44,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:17:44,070 INFO L495 AbstractCegarLoop]: Abstraction has 216 states and 286 transitions. [2022-11-16 20:17:44,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.545454545454546) internal successors, (244), 44 states have internal predecessors, (244), 37 states have call successors, (41), 1 states have call predecessors, (41), 19 states have return successors, (56), 21 states have call predecessors, (56), 37 states have call successors, (56) [2022-11-16 20:17:44,070 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 286 transitions. [2022-11-16 20:17:44,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1477 [2022-11-16 20:17:44,090 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:17:44,091 INFO L195 NwaCegarLoop]: trace histogram [151, 150, 122, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 74, 74, 47, 29, 1, 1, 1, 1] [2022-11-16 20:17:44,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-16 20:17:44,298 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:44,299 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:17:44,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:17:44,299 INFO L85 PathProgramCache]: Analyzing trace with hash 335539351, now seen corresponding path program 16 times [2022-11-16 20:17:44,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:17:44,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008553486] [2022-11-16 20:17:44,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:17:44,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:17:44,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:17:47,839 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 6528 proven. 10102 refuted. 0 times theorem prover too weak. 63427 trivial. 0 not checked. [2022-11-16 20:17:47,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:17:47,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008553486] [2022-11-16 20:17:47,839 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008553486] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:17:47,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015966025] [2022-11-16 20:17:47,840 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:17:47,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:17:47,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:17:47,841 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:17:47,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-16 20:17:48,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:17:48,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 2753 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-16 20:17:48,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:17:49,266 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 7303 proven. 10882 refuted. 0 times theorem prover too weak. 61872 trivial. 0 not checked. [2022-11-16 20:17:49,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:17:55,459 INFO L134 CoverageAnalysis]: Checked inductivity of 80057 backedges. 7303 proven. 11117 refuted. 0 times theorem prover too weak. 61637 trivial. 0 not checked. [2022-11-16 20:17:55,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015966025] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:17:55,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1207730884] [2022-11-16 20:17:55,461 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:17:55,462 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:17:55,462 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:17:55,463 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:17:55,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 35] total 40 [2022-11-16 20:17:55,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051680167] [2022-11-16 20:17:55,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:17:55,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-16 20:17:55,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:17:55,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-16 20:17:55,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2022-11-16 20:17:55,468 INFO L87 Difference]: Start difference. First operand 216 states and 286 transitions. Second operand has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) [2022-11-16 20:17:56,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:17:56,697 INFO L93 Difference]: Finished difference Result 458 states and 627 transitions. [2022-11-16 20:17:56,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-16 20:17:56,698 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) Word has length 1476 [2022-11-16 20:17:56,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:17:56,701 INFO L225 Difference]: With dead ends: 458 [2022-11-16 20:17:56,701 INFO L226 Difference]: Without dead ends: 247 [2022-11-16 20:17:56,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3008 GetRequests, 2929 SyntacticMatches, 17 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1235 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=999, Invalid=3033, Unknown=0, NotChecked=0, Total=4032 [2022-11-16 20:17:56,704 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 903 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 864 mSolverCounterSat, 1035 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 903 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 1899 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1035 IncrementalHoareTripleChecker+Valid, 864 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:17:56,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [903 Valid, 278 Invalid, 1899 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1035 Valid, 864 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 20:17:56,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2022-11-16 20:17:56,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 187. [2022-11-16 20:17:56,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 150 states have (on average 1.02) internal successors, (153), 149 states have internal predecessors, (153), 25 states have call successors, (25), 18 states have call predecessors, (25), 11 states have return successors, (68), 19 states have call predecessors, (68), 24 states have call successors, (68) [2022-11-16 20:17:56,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 246 transitions. [2022-11-16 20:17:56,728 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 246 transitions. Word has length 1476 [2022-11-16 20:17:56,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:17:56,729 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 246 transitions. [2022-11-16 20:17:56,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.5) internal successors, (220), 40 states have internal predecessors, (220), 33 states have call successors, (37), 1 states have call predecessors, (37), 17 states have return successors, (50), 19 states have call predecessors, (50), 33 states have call successors, (50) [2022-11-16 20:17:56,731 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 246 transitions. [2022-11-16 20:17:56,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1738 [2022-11-16 20:17:56,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:17:56,752 INFO L195 NwaCegarLoop]: trace histogram [178, 176, 144, 89, 89, 89, 89, 88, 88, 88, 88, 88, 88, 88, 87, 87, 55, 34, 1, 1, 1, 1] [2022-11-16 20:17:56,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-16 20:17:56,962 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-16 20:17:56,962 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:17:56,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:17:56,963 INFO L85 PathProgramCache]: Analyzing trace with hash -956644368, now seen corresponding path program 17 times [2022-11-16 20:17:56,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:17:56,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360750873] [2022-11-16 20:17:56,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:17:56,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:17:57,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:19:23,360 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18642 proven. 26756 refuted. 0 times theorem prover too weak. 65661 trivial. 0 not checked. [2022-11-16 20:19:23,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:19:23,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360750873] [2022-11-16 20:19:23,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360750873] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:19:23,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072484501] [2022-11-16 20:19:23,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 20:19:23,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:19:23,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:19:23,365 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:19:23,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-16 20:19:25,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 128 check-sat command(s) [2022-11-16 20:19:25,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:19:25,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 3214 conjuncts, 353 conjunts are in the unsatisfiable core [2022-11-16 20:19:25,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:19:27,262 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 18335 proven. 20467 refuted. 0 times theorem prover too weak. 72257 trivial. 0 not checked. [2022-11-16 20:19:27,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:21:25,647 INFO L134 CoverageAnalysis]: Checked inductivity of 111059 backedges. 20425 proven. 19582 refuted. 0 times theorem prover too weak. 71052 trivial. 0 not checked. [2022-11-16 20:21:25,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072484501] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:21:25,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1463868966] [2022-11-16 20:21:25,650 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:21:25,650 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:21:25,650 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:21:25,651 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:21:25,652 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27, 47] total 66 [2022-11-16 20:21:25,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777361769] [2022-11-16 20:21:25,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:21:25,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-16 20:21:25,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:21:25,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-16 20:21:25,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=3470, Unknown=0, NotChecked=0, Total=4422 [2022-11-16 20:21:25,655 INFO L87 Difference]: Start difference. First operand 187 states and 246 transitions. Second operand has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) [2022-11-16 20:21:25,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:21:25,991 INFO L93 Difference]: Finished difference Result 218 states and 304 transitions. [2022-11-16 20:21:25,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-16 20:21:25,992 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) Word has length 1737 [2022-11-16 20:21:25,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:21:25,996 INFO L225 Difference]: With dead ends: 218 [2022-11-16 20:21:25,996 INFO L226 Difference]: Without dead ends: 217 [2022-11-16 20:21:25,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3829 GetRequests, 3488 SyntacticMatches, 272 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13246 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1063, Invalid=3907, Unknown=0, NotChecked=0, Total=4970 [2022-11-16 20:21:25,998 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 75 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 20:21:25,998 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 183 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 20:21:25,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-11-16 20:21:26,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 207. [2022-11-16 20:21:26,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 164 states have internal predecessors, (169), 27 states have call successors, (27), 18 states have call predecessors, (27), 13 states have return successors, (94), 24 states have call predecessors, (94), 26 states have call successors, (94) [2022-11-16 20:21:26,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 290 transitions. [2022-11-16 20:21:26,013 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 290 transitions. Word has length 1737 [2022-11-16 20:21:26,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:21:26,014 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 290 transitions. [2022-11-16 20:21:26,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 2.515151515151515) internal successors, (166), 67 states have internal predecessors, (166), 18 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (46), 46 states have call predecessors, (46), 18 states have call successors, (46) [2022-11-16 20:21:26,015 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 290 transitions. [2022-11-16 20:21:26,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5225 [2022-11-16 20:21:26,202 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:21:26,203 INFO L195 NwaCegarLoop]: trace histogram [534, 531, 432, 267, 267, 267, 267, 266, 266, 266, 266, 266, 265, 265, 264, 264, 165, 102, 1, 1, 1, 1] [2022-11-16 20:21:26,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-16 20:21:26,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-16 20:21:26,403 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:21:26,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:21:26,404 INFO L85 PathProgramCache]: Analyzing trace with hash -854412320, now seen corresponding path program 18 times [2022-11-16 20:21:26,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:21:26,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437746606] [2022-11-16 20:21:26,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:21:26,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:21:27,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:22:13,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1011337 backedges. 16191 proven. 63281 refuted. 0 times theorem prover too weak. 931865 trivial. 0 not checked. [2022-11-16 20:22:13,338 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:22:13,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437746606] [2022-11-16 20:22:13,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437746606] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:22:13,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355765652] [2022-11-16 20:22:13,339 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 20:22:13,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:22:13,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:22:13,340 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:22:13,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-16 20:22:15,951 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 20:22:15,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 20:22:15,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 6464 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-16 20:22:16,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:22:16,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1011337 backedges. 467909 proven. 39094 refuted. 0 times theorem prover too weak. 504334 trivial. 0 not checked. [2022-11-16 20:22:16,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:22:30,848 INFO L134 CoverageAnalysis]: Checked inductivity of 1011337 backedges. 19040 proven. 69551 refuted. 0 times theorem prover too weak. 922746 trivial. 0 not checked. [2022-11-16 20:22:30,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355765652] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:22:30,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [703579267] [2022-11-16 20:22:30,853 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:22:30,853 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:22:30,853 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:22:30,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:22:30,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 42] total 47 [2022-11-16 20:22:30,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469053596] [2022-11-16 20:22:30,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:22:30,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-16 20:22:30,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:22:30,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-16 20:22:30,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1837, Unknown=0, NotChecked=0, Total=2162 [2022-11-16 20:22:30,866 INFO L87 Difference]: Start difference. First operand 207 states and 290 transitions. Second operand has 47 states, 47 states have (on average 6.0) internal successors, (282), 47 states have internal predecessors, (282), 42 states have call successors, (49), 3 states have call predecessors, (49), 21 states have return successors, (64), 23 states have call predecessors, (64), 41 states have call successors, (64) [2022-11-16 20:22:32,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:22:32,919 INFO L93 Difference]: Finished difference Result 511 states and 785 transitions. [2022-11-16 20:22:32,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-16 20:22:32,920 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 6.0) internal successors, (282), 47 states have internal predecessors, (282), 42 states have call successors, (49), 3 states have call predecessors, (49), 21 states have return successors, (64), 23 states have call predecessors, (64), 41 states have call successors, (64) Word has length 5224 [2022-11-16 20:22:32,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:22:32,925 INFO L225 Difference]: With dead ends: 511 [2022-11-16 20:22:32,925 INFO L226 Difference]: Without dead ends: 309 [2022-11-16 20:22:32,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10546 GetRequests, 10423 SyntacticMatches, 22 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2869 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2379, Invalid=8127, Unknown=0, NotChecked=0, Total=10506 [2022-11-16 20:22:32,930 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 1516 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 942 mSolverCounterSat, 1276 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1516 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 2218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1276 IncrementalHoareTripleChecker+Valid, 942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-16 20:22:32,930 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1516 Valid, 254 Invalid, 2218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1276 Valid, 942 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-16 20:22:32,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2022-11-16 20:22:32,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 263. [2022-11-16 20:22:32,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 213 states have (on average 1.0234741784037558) internal successors, (218), 209 states have internal predecessors, (218), 35 states have call successors, (35), 26 states have call predecessors, (35), 14 states have return successors, (112), 27 states have call predecessors, (112), 34 states have call successors, (112) [2022-11-16 20:22:32,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 365 transitions. [2022-11-16 20:22:32,951 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 365 transitions. Word has length 5224 [2022-11-16 20:22:32,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:22:32,953 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 365 transitions. [2022-11-16 20:22:32,954 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 6.0) internal successors, (282), 47 states have internal predecessors, (282), 42 states have call successors, (49), 3 states have call predecessors, (49), 21 states have return successors, (64), 23 states have call predecessors, (64), 41 states have call successors, (64) [2022-11-16 20:22:32,954 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 365 transitions. [2022-11-16 20:22:33,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3484 [2022-11-16 20:22:33,029 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:22:33,030 INFO L195 NwaCegarLoop]: trace histogram [356, 354, 288, 178, 178, 178, 178, 177, 177, 177, 177, 177, 177, 177, 176, 176, 110, 68, 1, 1, 1, 1] [2022-11-16 20:22:33,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-16 20:22:33,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-16 20:22:33,230 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:22:33,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:22:33,231 INFO L85 PathProgramCache]: Analyzing trace with hash -673060743, now seen corresponding path program 19 times [2022-11-16 20:22:33,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:22:33,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496323097] [2022-11-16 20:22:33,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:22:33,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:22:34,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:22:51,334 INFO L134 CoverageAnalysis]: Checked inductivity of 448785 backedges. 15442 proven. 36406 refuted. 0 times theorem prover too weak. 396937 trivial. 0 not checked. [2022-11-16 20:22:51,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 20:22:51,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496323097] [2022-11-16 20:22:51,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496323097] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 20:22:51,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286665044] [2022-11-16 20:22:51,335 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 20:22:51,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 20:22:51,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 20:22:51,336 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 20:22:51,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-16 20:22:53,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 20:22:53,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 6459 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-16 20:22:53,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 20:22:54,413 INFO L134 CoverageAnalysis]: Checked inductivity of 448785 backedges. 205996 proven. 20731 refuted. 0 times theorem prover too weak. 222058 trivial. 0 not checked. [2022-11-16 20:22:54,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 20:23:06,821 INFO L134 CoverageAnalysis]: Checked inductivity of 448785 backedges. 15424 proven. 37961 refuted. 0 times theorem prover too weak. 395400 trivial. 0 not checked. [2022-11-16 20:23:06,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286665044] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 20:23:06,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1405068330] [2022-11-16 20:23:06,823 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 20:23:06,823 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 20:23:06,823 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-16 20:23:06,824 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 20:23:06,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 39] total 44 [2022-11-16 20:23:06,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482867166] [2022-11-16 20:23:06,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 20:23:06,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-16 20:23:06,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 20:23:06,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-16 20:23:06,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1581, Unknown=0, NotChecked=0, Total=1892 [2022-11-16 20:23:06,831 INFO L87 Difference]: Start difference. First operand 263 states and 365 transitions. Second operand has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) [2022-11-16 20:23:08,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 20:23:08,173 INFO L93 Difference]: Finished difference Result 540 states and 768 transitions. [2022-11-16 20:23:08,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-16 20:23:08,174 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) Word has length 3483 [2022-11-16 20:23:08,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 20:23:08,177 INFO L225 Difference]: With dead ends: 540 [2022-11-16 20:23:08,177 INFO L226 Difference]: Without dead ends: 282 [2022-11-16 20:23:08,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7031 GetRequests, 6943 SyntacticMatches, 19 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1470 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1214, Invalid=3756, Unknown=0, NotChecked=0, Total=4970 [2022-11-16 20:23:08,181 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 779 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 808 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 779 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 1946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 808 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 20:23:08,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [779 Valid, 342 Invalid, 1946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [808 Valid, 1138 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 20:23:08,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2022-11-16 20:23:08,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 210. [2022-11-16 20:23:08,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 169 states have (on average 1.017751479289941) internal successors, (172), 167 states have internal predecessors, (172), 28 states have call successors, (28), 20 states have call predecessors, (28), 12 states have return successors, (81), 22 states have call predecessors, (81), 27 states have call successors, (81) [2022-11-16 20:23:08,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 281 transitions. [2022-11-16 20:23:08,198 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 281 transitions. Word has length 3483 [2022-11-16 20:23:08,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 20:23:08,199 INFO L495 AbstractCegarLoop]: Abstraction has 210 states and 281 transitions. [2022-11-16 20:23:08,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.7727272727272725) internal successors, (254), 44 states have internal predecessors, (254), 38 states have call successors, (43), 2 states have call predecessors, (43), 20 states have return successors, (58), 20 states have call predecessors, (58), 38 states have call successors, (58) [2022-11-16 20:23:08,200 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 281 transitions. [2022-11-16 20:23:08,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4563 [2022-11-16 20:23:08,348 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 20:23:08,350 INFO L195 NwaCegarLoop]: trace histogram [466, 464, 377, 233, 233, 233, 233, 232, 232, 232, 232, 232, 232, 232, 231, 231, 144, 89, 1, 1, 1, 1] [2022-11-16 20:23:08,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-16 20:23:08,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_316d79a7-555a-4567-843d-8a33481ad0c3/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-16 20:23:08,563 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting fibonacciErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [fibonacciErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, fibonacciErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 3 more)] === [2022-11-16 20:23:08,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 20:23:08,563 INFO L85 PathProgramCache]: Analyzing trace with hash 1874607240, now seen corresponding path program 20 times [2022-11-16 20:23:08,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 20:23:08,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650005418] [2022-11-16 20:23:08,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 20:23:08,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 20:23:09,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat