./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_10-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e04fb08f Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/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_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_10-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b6366e3b98da5ee88513ec6586b547e61d25aed49a53277f23448bdf367b4562 --- 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 19:42:53,888 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-16 19:42:53,891 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-16 19:42:53,930 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-16 19:42:53,932 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-16 19:42:53,936 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-16 19:42:53,939 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-16 19:42:53,943 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-16 19:42:53,945 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-16 19:42:53,950 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-16 19:42:53,952 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-16 19:42:53,954 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-16 19:42:53,955 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-16 19:42:53,957 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-16 19:42:53,958 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-16 19:42:53,963 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-16 19:42:53,965 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-16 19:42:53,966 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-16 19:42:53,968 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-16 19:42:53,971 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-16 19:42:53,977 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-16 19:42:53,978 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-16 19:42:53,979 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-16 19:42:53,981 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-16 19:42:53,985 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-16 19:42:53,990 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-16 19:42:53,990 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-16 19:42:53,991 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-16 19:42:53,992 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-16 19:42:53,994 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-16 19:42:53,994 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-16 19:42:53,995 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-16 19:42:53,997 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-16 19:42:53,998 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-16 19:42:54,000 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-16 19:42:54,000 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-16 19:42:54,001 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-16 19:42:54,002 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-16 19:42:54,002 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-16 19:42:54,003 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-16 19:42:54,003 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-16 19:42:54,004 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-16 19:42:54,045 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-16 19:42:54,045 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-16 19:42:54,046 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-16 19:42:54,046 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-16 19:42:54,047 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-16 19:42:54,047 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-16 19:42:54,048 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-16 19:42:54,048 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-16 19:42:54,048 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-16 19:42:54,048 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-16 19:42:54,049 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-16 19:42:54,050 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-16 19:42:54,050 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-16 19:42:54,050 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-16 19:42:54,051 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-16 19:42:54,051 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-16 19:42:54,051 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-16 19:42:54,051 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-16 19:42:54,052 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-16 19:42:54,053 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-16 19:42:54,053 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-16 19:42:54,053 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-16 19:42:54,053 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-16 19:42:54,054 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-16 19:42:54,054 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-16 19:42:54,054 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-16 19:42:54,054 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-16 19:42:54,055 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-16 19:42:54,055 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-16 19:42:54,055 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-16 19:42:54,056 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-16 19:42:54,056 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-16 19:42:54,056 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 19:42:54,057 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-16 19:42:54,057 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-16 19:42:54,057 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-16 19:42:54,057 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-16 19:42:54,058 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-16 19:42:54,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-16 19:42:54,058 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-16 19:42:54,058 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-16 19:42:54,059 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_ce9c6eac-370b-46e0-bad6-9425d362ab7a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b6366e3b98da5ee88513ec6586b547e61d25aed49a53277f23448bdf367b4562 [2022-11-16 19:42:54,388 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-16 19:42:54,418 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-16 19:42:54,422 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-16 19:42:54,423 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-16 19:42:54,424 INFO L275 PluginConnector]: CDTParser initialized [2022-11-16 19:42:54,425 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/../../sv-benchmarks/c/recursive-simple/fibo_2calls_10-1.c [2022-11-16 19:42:54,513 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/data/4a4386960/62b1f9b756324a62bb521e92f4470074/FLAG7fbdf365c [2022-11-16 19:42:54,968 INFO L306 CDTParser]: Found 1 translation units. [2022-11-16 19:42:54,968 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/sv-benchmarks/c/recursive-simple/fibo_2calls_10-1.c [2022-11-16 19:42:54,981 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/data/4a4386960/62b1f9b756324a62bb521e92f4470074/FLAG7fbdf365c [2022-11-16 19:42:55,356 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/data/4a4386960/62b1f9b756324a62bb521e92f4470074 [2022-11-16 19:42:55,358 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-16 19:42:55,360 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-16 19:42:55,363 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-16 19:42:55,363 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-16 19:42:55,367 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-16 19:42:55,368 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,369 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@154fdfdb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55, skipping insertion in model container [2022-11-16 19:42:55,370 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,378 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-16 19:42:55,392 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-16 19:42:55,569 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_ce9c6eac-370b-46e0-bad6-9425d362ab7a/sv-benchmarks/c/recursive-simple/fibo_2calls_10-1.c[949,962] [2022-11-16 19:42:55,572 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 19:42:55,582 INFO L203 MainTranslator]: Completed pre-run [2022-11-16 19:42:55,597 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_ce9c6eac-370b-46e0-bad6-9425d362ab7a/sv-benchmarks/c/recursive-simple/fibo_2calls_10-1.c[949,962] [2022-11-16 19:42:55,598 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-16 19:42:55,611 INFO L208 MainTranslator]: Completed translation [2022-11-16 19:42:55,612 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55 WrapperNode [2022-11-16 19:42:55,612 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-16 19:42:55,613 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-16 19:42:55,614 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-16 19:42:55,614 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-16 19:42:55,621 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,628 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,642 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-11-16 19:42:55,643 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-16 19:42:55,644 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-16 19:42:55,644 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-16 19:42:55,644 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-16 19:42:55,653 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,664 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,665 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,672 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,674 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,675 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,676 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,677 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-16 19:42:55,678 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-16 19:42:55,678 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-16 19:42:55,678 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-16 19:42:55,682 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (1/1) ... [2022-11-16 19:42:55,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-16 19:42:55,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:42:55,724 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-16 19:42:55,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-16 19:42:55,784 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-16 19:42:55,784 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-16 19:42:55,784 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-11-16 19:42:55,785 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-11-16 19:42:55,785 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-11-16 19:42:55,785 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-11-16 19:42:55,785 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-16 19:42:55,785 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-16 19:42:55,858 INFO L235 CfgBuilder]: Building ICFG [2022-11-16 19:42:55,861 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-16 19:42:56,051 INFO L276 CfgBuilder]: Performing block encoding [2022-11-16 19:42:56,078 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-16 19:42:56,078 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-16 19:42:56,083 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:42:56 BoogieIcfgContainer [2022-11-16 19:42:56,083 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-16 19:42:56,085 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-16 19:42:56,086 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-16 19:42:56,090 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-16 19:42:56,091 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.11 07:42:55" (1/3) ... [2022-11-16 19:42:56,091 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41884f34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 07:42:56, skipping insertion in model container [2022-11-16 19:42:56,092 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.11 07:42:55" (2/3) ... [2022-11-16 19:42:56,092 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41884f34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.11 07:42:56, skipping insertion in model container [2022-11-16 19:42:56,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:42:56" (3/3) ... [2022-11-16 19:42:56,094 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-1.c [2022-11-16 19:42:56,113 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-16 19:42:56,114 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-16 19:42:56,190 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-16 19:42:56,210 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;@7f8cf4b0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-16 19:42:56,210 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-16 19:42:56,216 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-16 19:42:56,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-16 19:42:56,224 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:42:56,225 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:42:56,226 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:42:56,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:42:56,233 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2022-11-16 19:42:56,246 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:42:56,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031734456] [2022-11-16 19:42:56,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:56,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:42:56,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:42:56,568 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 19:42:56,569 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:42:56,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031734456] [2022-11-16 19:42:56,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031734456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:42:56,571 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:42:56,571 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-16 19:42:56,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288988183] [2022-11-16 19:42:56,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:42:56,578 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 19:42:56,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:42:56,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 19:42:56,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-16 19:42:56,609 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-16 19:42:56,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:42:56,705 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-11-16 19:42:56,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 19:42:56,708 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-11-16 19:42:56,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:42:56,716 INFO L225 Difference]: With dead ends: 34 [2022-11-16 19:42:56,716 INFO L226 Difference]: Without dead ends: 26 [2022-11-16 19:42:56,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-16 19:42:56,723 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 13 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:42:56,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 66 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:42:56,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-16 19:42:56,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-16 19:42:56,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-16 19:42:56,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-16 19:42:56,777 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2022-11-16 19:42:56,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:42:56,777 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-16 19:42:56,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-16 19:42:56,778 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-16 19:42:56,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-16 19:42:56,781 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:42:56,782 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:42:56,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-16 19:42:56,782 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:42:56,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:42:56,783 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2022-11-16 19:42:56,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:42:56,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461443899] [2022-11-16 19:42:56,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:56,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:42:56,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:42:56,893 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 19:42:56,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:42:56,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461443899] [2022-11-16 19:42:56,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461443899] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:42:56,894 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-16 19:42:56,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-16 19:42:56,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044930292] [2022-11-16 19:42:56,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:42:56,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-16 19:42:56,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:42:56,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-16 19:42:56,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-16 19:42:56,898 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-16 19:42:56,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:42:56,964 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-11-16 19:42:56,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-16 19:42:56,965 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-11-16 19:42:56,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:42:56,966 INFO L225 Difference]: With dead ends: 32 [2022-11-16 19:42:56,967 INFO L226 Difference]: Without dead ends: 28 [2022-11-16 19:42:56,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-16 19:42:56,969 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:42:56,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 63 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-16 19:42:56,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-16 19:42:56,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2022-11-16 19:42:56,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-16 19:42:56,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-16 19:42:56,980 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2022-11-16 19:42:56,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:42:56,982 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-16 19:42:56,983 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-16 19:42:56,984 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-16 19:42:56,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-16 19:42:56,987 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:42:56,988 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:42:56,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-16 19:42:56,989 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:42:56,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:42:56,995 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2022-11-16 19:42:56,995 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:42:56,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812871454] [2022-11-16 19:42:56,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:56,996 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:42:57,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:42:57,179 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 19:42:57,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:42:57,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812871454] [2022-11-16 19:42:57,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812871454] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:42:57,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488989443] [2022-11-16 19:42:57,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:57,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:42:57,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:42:57,190 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:42:57,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-16 19:42:57,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:42:57,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-16 19:42:57,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:42:57,373 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 19:42:57,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:42:57,647 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-16 19:42:57,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488989443] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:42:57,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [166339176] [2022-11-16 19:42:57,674 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-16 19:42:57,674 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:42:57,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-16 19:42:57,685 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-16 19:42:57,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-16 19:42:57,774 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2022-11-16 19:42:57,841 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 39 for LOIs [2022-11-16 19:42:57,851 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-16 19:42:58,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [166339176] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-16 19:42:58,206 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:42:58,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2022-11-16 19:42:58,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226323015] [2022-11-16 19:42:58,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-16 19:42:58,207 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-16 19:42:58,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:42:58,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-16 19:42:58,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-16 19:42:58,209 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 19:42:58,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:42:58,348 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-11-16 19:42:58,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-16 19:42:58,349 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2022-11-16 19:42:58,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:42:58,351 INFO L225 Difference]: With dead ends: 68 [2022-11-16 19:42:58,351 INFO L226 Difference]: Without dead ends: 44 [2022-11-16 19:42:58,352 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-16 19:42:58,353 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 23 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:42:58,353 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 92 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:42:58,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-16 19:42:58,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-11-16 19:42:58,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-16 19:42:58,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-11-16 19:42:58,365 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2022-11-16 19:42:58,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:42:58,365 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-11-16 19:42:58,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-16 19:42:58,366 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-11-16 19:42:58,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-16 19:42:58,368 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:42:58,368 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:42:58,378 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-16 19:42:58,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:42:58,573 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:42:58,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:42:58,574 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2022-11-16 19:42:58,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:42:58,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368637302] [2022-11-16 19:42:58,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:58,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:42:58,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:42:58,667 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 19:42:58,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:42:58,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368637302] [2022-11-16 19:42:58,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368637302] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:42:58,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977130068] [2022-11-16 19:42:58,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:58,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:42:58,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:42:58,670 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:42:58,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-16 19:42:58,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:42:58,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 19:42:58,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:42:58,826 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-16 19:42:58,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:42:59,215 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-16 19:42:59,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977130068] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:42:59,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [835939887] [2022-11-16 19:42:59,218 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:42:59,218 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:42:59,219 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 19:42:59,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:42:59,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2022-11-16 19:42:59,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898292878] [2022-11-16 19:42:59,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:42:59,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-16 19:42:59,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:42:59,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-16 19:42:59,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-16 19:42:59,224 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-16 19:42:59,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:42:59,460 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2022-11-16 19:42:59,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-16 19:42:59,461 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 35 [2022-11-16 19:42:59,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:42:59,463 INFO L225 Difference]: With dead ends: 85 [2022-11-16 19:42:59,463 INFO L226 Difference]: Without dead ends: 53 [2022-11-16 19:42:59,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-11-16 19:42:59,465 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 38 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:42:59,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 95 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:42:59,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-16 19:42:59,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2022-11-16 19:42:59,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-16 19:42:59,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-11-16 19:42:59,479 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2022-11-16 19:42:59,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:42:59,479 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-11-16 19:42:59,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-16 19:42:59,479 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-11-16 19:42:59,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-16 19:42:59,481 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:42:59,481 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:42:59,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-16 19:42:59,681 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:42:59,682 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:42:59,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:42:59,682 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2022-11-16 19:42:59,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:42:59,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433817374] [2022-11-16 19:42:59,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:59,683 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:42:59,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:42:59,873 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-16 19:42:59,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:42:59,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433817374] [2022-11-16 19:42:59,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433817374] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:42:59,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153414963] [2022-11-16 19:42:59,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:42:59,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:42:59,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:42:59,876 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:42:59,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-16 19:42:59,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:42:59,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 19:42:59,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:00,034 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-16 19:43:00,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:00,508 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-16 19:43:00,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153414963] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:00,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [468263975] [2022-11-16 19:43:00,511 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:00,511 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:00,512 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 19:43:00,513 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:00,513 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2022-11-16 19:43:00,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662097415] [2022-11-16 19:43:00,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:00,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-16 19:43:00,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:00,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-16 19:43:00,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-11-16 19:43:00,515 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-16 19:43:01,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:01,079 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2022-11-16 19:43:01,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 19:43:01,080 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2022-11-16 19:43:01,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:01,086 INFO L225 Difference]: With dead ends: 121 [2022-11-16 19:43:01,091 INFO L226 Difference]: Without dead ends: 77 [2022-11-16 19:43:01,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2022-11-16 19:43:01,096 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 63 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:01,097 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 166 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 19:43:01,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-16 19:43:01,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2022-11-16 19:43:01,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.15) internal successors, (46), 43 states have internal predecessors, (46), 14 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (31), 14 states have call predecessors, (31), 14 states have call successors, (31) [2022-11-16 19:43:01,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2022-11-16 19:43:01,118 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2022-11-16 19:43:01,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:01,118 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2022-11-16 19:43:01,119 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-16 19:43:01,119 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2022-11-16 19:43:01,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-16 19:43:01,121 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:01,121 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:01,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:01,327 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:01,327 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:01,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:01,328 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2022-11-16 19:43:01,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:01,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382358818] [2022-11-16 19:43:01,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:01,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:01,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:01,448 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-16 19:43:01,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:01,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382358818] [2022-11-16 19:43:01,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382358818] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:01,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044998987] [2022-11-16 19:43:01,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:01,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:01,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:01,451 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:01,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-16 19:43:01,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:01,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 19:43:01,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:01,642 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-16 19:43:01,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:02,250 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-16 19:43:02,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044998987] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:02,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41432175] [2022-11-16 19:43:02,252 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:02,252 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:02,253 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 19:43:02,253 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:02,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2022-11-16 19:43:02,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217989966] [2022-11-16 19:43:02,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:02,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-16 19:43:02,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:02,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-16 19:43:02,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-11-16 19:43:02,255 INFO L87 Difference]: Start difference. First operand 63 states and 91 transitions. Second operand has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2022-11-16 19:43:02,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:02,507 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2022-11-16 19:43:02,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-16 19:43:02,508 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) Word has length 50 [2022-11-16 19:43:02,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:02,514 INFO L225 Difference]: With dead ends: 119 [2022-11-16 19:43:02,514 INFO L226 Difference]: Without dead ends: 97 [2022-11-16 19:43:02,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-11-16 19:43:02,518 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 59 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:02,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 73 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-16 19:43:02,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-16 19:43:02,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2022-11-16 19:43:02,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 49 states have internal predecessors, (52), 14 states have call successors, (14), 5 states have call predecessors, (14), 11 states have return successors, (39), 17 states have call predecessors, (39), 14 states have call successors, (39) [2022-11-16 19:43:02,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2022-11-16 19:43:02,550 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2022-11-16 19:43:02,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:02,550 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2022-11-16 19:43:02,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2022-11-16 19:43:02,551 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2022-11-16 19:43:02,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-16 19:43:02,554 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:02,554 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:02,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:02,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-16 19:43:02,760 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:02,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:02,760 INFO L85 PathProgramCache]: Analyzing trace with hash 1766289300, now seen corresponding path program 1 times [2022-11-16 19:43:02,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:02,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814885697] [2022-11-16 19:43:02,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:02,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:02,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:03,000 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 39 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-11-16 19:43:03,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:03,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814885697] [2022-11-16 19:43:03,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814885697] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:03,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094863227] [2022-11-16 19:43:03,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:03,001 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:03,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:03,002 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:03,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-16 19:43:03,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:03,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-16 19:43:03,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:03,254 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2022-11-16 19:43:03,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:04,264 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 81 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-16 19:43:04,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094863227] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:04,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [394170055] [2022-11-16 19:43:04,269 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:04,270 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:04,271 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 19:43:04,272 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:04,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2022-11-16 19:43:04,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222616] [2022-11-16 19:43:04,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:04,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-16 19:43:04,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:04,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-16 19:43:04,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-11-16 19:43:04,277 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2022-11-16 19:43:05,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:05,197 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2022-11-16 19:43:05,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-16 19:43:05,197 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) Word has length 79 [2022-11-16 19:43:05,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:05,200 INFO L225 Difference]: With dead ends: 204 [2022-11-16 19:43:05,200 INFO L226 Difference]: Without dead ends: 115 [2022-11-16 19:43:05,202 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 147 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2022-11-16 19:43:05,202 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 106 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 689 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 689 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:05,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 245 Invalid, 826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 689 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 19:43:05,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-16 19:43:05,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2022-11-16 19:43:05,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 64 states have (on average 1.171875) internal successors, (75), 66 states have internal predecessors, (75), 19 states have call successors, (19), 8 states have call predecessors, (19), 14 states have return successors, (50), 23 states have call predecessors, (50), 19 states have call successors, (50) [2022-11-16 19:43:05,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2022-11-16 19:43:05,234 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 79 [2022-11-16 19:43:05,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:05,237 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2022-11-16 19:43:05,238 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2022-11-16 19:43:05,238 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2022-11-16 19:43:05,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-11-16 19:43:05,251 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:05,252 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 9, 9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:05,259 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-16 19:43:05,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-16 19:43:05,458 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:05,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:05,458 INFO L85 PathProgramCache]: Analyzing trace with hash 1596421381, now seen corresponding path program 1 times [2022-11-16 19:43:05,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:05,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770477037] [2022-11-16 19:43:05,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:05,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:05,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:05,603 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 39 proven. 116 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-11-16 19:43:05,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:05,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770477037] [2022-11-16 19:43:05,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770477037] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:05,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996713897] [2022-11-16 19:43:05,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:05,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:05,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:05,605 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:05,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-16 19:43:05,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:05,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-16 19:43:05,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:05,853 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 29 proven. 202 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2022-11-16 19:43:05,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:07,281 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 29 proven. 216 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2022-11-16 19:43:07,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996713897] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:07,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1249859770] [2022-11-16 19:43:07,286 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:07,286 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:07,287 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 19:43:07,287 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:07,287 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 15] total 20 [2022-11-16 19:43:07,287 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004935929] [2022-11-16 19:43:07,288 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:07,288 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-16 19:43:07,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:07,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-16 19:43:07,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-11-16 19:43:07,290 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2022-11-16 19:43:07,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:07,605 INFO L93 Difference]: Finished difference Result 191 states and 315 transitions. [2022-11-16 19:43:07,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-16 19:43:07,606 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) Word has length 142 [2022-11-16 19:43:07,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:07,608 INFO L225 Difference]: With dead ends: 191 [2022-11-16 19:43:07,608 INFO L226 Difference]: Without dead ends: 103 [2022-11-16 19:43:07,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 265 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2022-11-16 19:43:07,610 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 53 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:07,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 135 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 19:43:07,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-16 19:43:07,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2022-11-16 19:43:07,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 68 states have internal predecessors, (76), 19 states have call successors, (19), 8 states have call predecessors, (19), 15 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) [2022-11-16 19:43:07,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2022-11-16 19:43:07,634 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 142 [2022-11-16 19:43:07,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:07,635 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2022-11-16 19:43:07,635 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2022-11-16 19:43:07,636 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2022-11-16 19:43:07,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2022-11-16 19:43:07,640 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:07,642 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:07,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:07,848 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:07,848 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:07,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:07,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1303291698, now seen corresponding path program 2 times [2022-11-16 19:43:07,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:07,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949632262] [2022-11-16 19:43:07,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:07,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:07,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:08,189 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 47 proven. 183 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2022-11-16 19:43:08,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:08,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949632262] [2022-11-16 19:43:08,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949632262] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:08,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013986849] [2022-11-16 19:43:08,190 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:43:08,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:08,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:08,191 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:08,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-16 19:43:08,300 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-16 19:43:08,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:08,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-16 19:43:08,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:08,380 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 160 proven. 37 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2022-11-16 19:43:08,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:09,123 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 162 proven. 40 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2022-11-16 19:43:09,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013986849] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:09,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136508183] [2022-11-16 19:43:09,125 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:09,126 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:09,126 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 19:43:09,127 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:09,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 18 [2022-11-16 19:43:09,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560205203] [2022-11-16 19:43:09,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:09,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-16 19:43:09,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:09,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-16 19:43:09,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-11-16 19:43:09,129 INFO L87 Difference]: Start difference. First operand 100 states and 143 transitions. Second operand has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) [2022-11-16 19:43:09,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:09,412 INFO L93 Difference]: Finished difference Result 140 states and 225 transitions. [2022-11-16 19:43:09,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-16 19:43:09,413 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) Word has length 159 [2022-11-16 19:43:09,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:09,415 INFO L225 Difference]: With dead ends: 140 [2022-11-16 19:43:09,415 INFO L226 Difference]: Without dead ends: 123 [2022-11-16 19:43:09,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 309 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2022-11-16 19:43:09,417 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 53 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:09,417 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 116 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 19:43:09,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-11-16 19:43:09,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 110. [2022-11-16 19:43:09,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 71 states have (on average 1.1549295774647887) internal successors, (82), 74 states have internal predecessors, (82), 21 states have call successors, (21), 8 states have call predecessors, (21), 17 states have return successors, (58), 27 states have call predecessors, (58), 21 states have call successors, (58) [2022-11-16 19:43:09,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 161 transitions. [2022-11-16 19:43:09,453 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 161 transitions. Word has length 159 [2022-11-16 19:43:09,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:09,453 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 161 transitions. [2022-11-16 19:43:09,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.9375) internal successors, (63), 18 states have internal predecessors, (63), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (25), 12 states have call predecessors, (25), 12 states have call successors, (25) [2022-11-16 19:43:09,454 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 161 transitions. [2022-11-16 19:43:09,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2022-11-16 19:43:09,458 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:09,458 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 14, 13, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 6, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:09,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:09,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:09,664 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:09,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:09,665 INFO L85 PathProgramCache]: Analyzing trace with hash 994120084, now seen corresponding path program 3 times [2022-11-16 19:43:09,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:09,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647152881] [2022-11-16 19:43:09,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:09,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:09,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:10,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 62 proven. 406 refuted. 0 times theorem prover too weak. 1113 trivial. 0 not checked. [2022-11-16 19:43:10,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:10,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647152881] [2022-11-16 19:43:10,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647152881] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:10,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660304188] [2022-11-16 19:43:10,071 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:43:10,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:10,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:10,072 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:10,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-16 19:43:10,219 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:43:10,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:10,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-16 19:43:10,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:10,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 927 proven. 132 refuted. 0 times theorem prover too weak. 522 trivial. 0 not checked. [2022-11-16 19:43:10,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:12,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1581 backedges. 150 proven. 531 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2022-11-16 19:43:12,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660304188] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:12,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2067537960] [2022-11-16 19:43:12,458 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:12,458 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:12,459 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 19:43:12,459 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:12,459 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 19] total 26 [2022-11-16 19:43:12,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432732147] [2022-11-16 19:43:12,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:12,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-16 19:43:12,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:12,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-16 19:43:12,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2022-11-16 19:43:12,461 INFO L87 Difference]: Start difference. First operand 110 states and 161 transitions. Second operand has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) [2022-11-16 19:43:13,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:13,434 INFO L93 Difference]: Finished difference Result 271 states and 523 transitions. [2022-11-16 19:43:13,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-16 19:43:13,435 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) Word has length 240 [2022-11-16 19:43:13,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:13,438 INFO L225 Difference]: With dead ends: 271 [2022-11-16 19:43:13,438 INFO L226 Difference]: Without dead ends: 153 [2022-11-16 19:43:13,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 460 SyntacticMatches, 9 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=355, Invalid=1807, Unknown=0, NotChecked=0, Total=2162 [2022-11-16 19:43:13,441 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 151 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 1019 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:13,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 236 Invalid, 1019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 19:43:13,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-11-16 19:43:13,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 138. [2022-11-16 19:43:13,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 93 states have (on average 1.1505376344086022) internal successors, (107), 92 states have internal predecessors, (107), 26 states have call successors, (26), 15 states have call predecessors, (26), 18 states have return successors, (74), 30 states have call predecessors, (74), 26 states have call successors, (74) [2022-11-16 19:43:13,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 207 transitions. [2022-11-16 19:43:13,460 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 207 transitions. Word has length 240 [2022-11-16 19:43:13,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:13,461 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 207 transitions. [2022-11-16 19:43:13,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 4.08) internal successors, (102), 26 states have internal predecessors, (102), 22 states have call successors, (30), 2 states have call predecessors, (30), 12 states have return successors, (36), 11 states have call predecessors, (36), 22 states have call successors, (36) [2022-11-16 19:43:13,461 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 207 transitions. [2022-11-16 19:43:13,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2022-11-16 19:43:13,467 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:13,467 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 22, 22, 18, 17, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 6, 4, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:13,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:13,673 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-16 19:43:13,674 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:13,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:13,674 INFO L85 PathProgramCache]: Analyzing trace with hash -276109964, now seen corresponding path program 4 times [2022-11-16 19:43:13,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:13,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563318880] [2022-11-16 19:43:13,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:13,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:13,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:14,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 664 refuted. 0 times theorem prover too weak. 2137 trivial. 0 not checked. [2022-11-16 19:43:14,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:14,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563318880] [2022-11-16 19:43:14,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563318880] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:14,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598271700] [2022-11-16 19:43:14,352 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:43:14,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:14,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:14,353 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:14,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-16 19:43:14,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:14,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 736 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-16 19:43:14,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:14,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 664 refuted. 0 times theorem prover too weak. 2137 trivial. 0 not checked. [2022-11-16 19:43:14,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:16,936 INFO L134 CoverageAnalysis]: Checked inductivity of 2897 backedges. 96 proven. 688 refuted. 0 times theorem prover too weak. 2113 trivial. 0 not checked. [2022-11-16 19:43:16,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598271700] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:16,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [333965417] [2022-11-16 19:43:16,939 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:16,939 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:16,940 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 19:43:16,941 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:16,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 17] total 20 [2022-11-16 19:43:16,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774175791] [2022-11-16 19:43:16,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:16,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-16 19:43:16,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:16,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-16 19:43:16,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2022-11-16 19:43:16,943 INFO L87 Difference]: Start difference. First operand 138 states and 207 transitions. Second operand has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 20 states have internal predecessors, (68), 17 states have call successors, (20), 1 states have call predecessors, (20), 8 states have return successors, (24), 8 states have call predecessors, (24), 17 states have call successors, (24) [2022-11-16 19:43:17,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:17,234 INFO L93 Difference]: Finished difference Result 165 states and 266 transitions. [2022-11-16 19:43:17,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-16 19:43:17,234 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 20 states have internal predecessors, (68), 17 states have call successors, (20), 1 states have call predecessors, (20), 8 states have return successors, (24), 8 states have call predecessors, (24), 17 states have call successors, (24) Word has length 320 [2022-11-16 19:43:17,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:17,237 INFO L225 Difference]: With dead ends: 165 [2022-11-16 19:43:17,237 INFO L226 Difference]: Without dead ends: 151 [2022-11-16 19:43:17,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 662 GetRequests, 630 SyntacticMatches, 7 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2022-11-16 19:43:17,239 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 102 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:17,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 109 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 19:43:17,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-11-16 19:43:17,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 141. [2022-11-16 19:43:17,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 95 states have (on average 1.1473684210526316) internal successors, (109), 94 states have internal predecessors, (109), 26 states have call successors, (26), 15 states have call predecessors, (26), 19 states have return successors, (75), 31 states have call predecessors, (75), 26 states have call successors, (75) [2022-11-16 19:43:17,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 210 transitions. [2022-11-16 19:43:17,254 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 210 transitions. Word has length 320 [2022-11-16 19:43:17,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:17,255 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 210 transitions. [2022-11-16 19:43:17,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 20 states have internal predecessors, (68), 17 states have call successors, (20), 1 states have call predecessors, (20), 8 states have return successors, (24), 8 states have call predecessors, (24), 17 states have call successors, (24) [2022-11-16 19:43:17,255 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 210 transitions. [2022-11-16 19:43:17,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 364 [2022-11-16 19:43:17,262 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:17,262 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 22, 20, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 9, 7, 6, 5, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:17,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:17,469 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-16 19:43:17,469 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:17,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:17,470 INFO L85 PathProgramCache]: Analyzing trace with hash -1215508947, now seen corresponding path program 5 times [2022-11-16 19:43:17,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:17,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094706973] [2022-11-16 19:43:17,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:17,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:17,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:18,014 INFO L134 CoverageAnalysis]: Checked inductivity of 3749 backedges. 182 proven. 581 refuted. 0 times theorem prover too weak. 2986 trivial. 0 not checked. [2022-11-16 19:43:18,014 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:18,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094706973] [2022-11-16 19:43:18,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094706973] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:18,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518925980] [2022-11-16 19:43:18,015 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:43:18,015 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:18,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:18,016 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:18,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-16 19:43:18,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-16 19:43:18,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:18,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-16 19:43:18,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:18,393 INFO L134 CoverageAnalysis]: Checked inductivity of 3749 backedges. 1681 proven. 33 refuted. 0 times theorem prover too weak. 2035 trivial. 0 not checked. [2022-11-16 19:43:18,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:20,027 INFO L134 CoverageAnalysis]: Checked inductivity of 3749 backedges. 650 proven. 162 refuted. 0 times theorem prover too weak. 2937 trivial. 0 not checked. [2022-11-16 19:43:20,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518925980] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:20,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [549570320] [2022-11-16 19:43:20,036 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:20,036 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:20,037 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 19:43:20,038 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:20,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 13] total 24 [2022-11-16 19:43:20,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053780243] [2022-11-16 19:43:20,039 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:20,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-16 19:43:20,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:20,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-16 19:43:20,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2022-11-16 19:43:20,041 INFO L87 Difference]: Start difference. First operand 141 states and 210 transitions. Second operand has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 17 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (35), 14 states have call predecessors, (35), 17 states have call successors, (35) [2022-11-16 19:43:21,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:21,018 INFO L93 Difference]: Finished difference Result 352 states and 630 transitions. [2022-11-16 19:43:21,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-16 19:43:21,019 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 17 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (35), 14 states have call predecessors, (35), 17 states have call successors, (35) Word has length 363 [2022-11-16 19:43:21,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:21,023 INFO L225 Difference]: With dead ends: 352 [2022-11-16 19:43:21,023 INFO L226 Difference]: Without dead ends: 215 [2022-11-16 19:43:21,025 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 711 SyntacticMatches, 6 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 458 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=356, Invalid=1900, Unknown=0, NotChecked=0, Total=2256 [2022-11-16 19:43:21,025 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 122 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 778 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:21,026 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 191 Invalid, 952 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 778 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-16 19:43:21,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-11-16 19:43:21,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 181. [2022-11-16 19:43:21,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 123 states have (on average 1.1626016260162602) internal successors, (143), 121 states have internal predecessors, (143), 36 states have call successors, (36), 22 states have call predecessors, (36), 21 states have return successors, (123), 37 states have call predecessors, (123), 36 states have call successors, (123) [2022-11-16 19:43:21,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 302 transitions. [2022-11-16 19:43:21,052 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 302 transitions. Word has length 363 [2022-11-16 19:43:21,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:21,054 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 302 transitions. [2022-11-16 19:43:21,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 24 states have internal predecessors, (96), 17 states have call successors, (28), 2 states have call predecessors, (28), 13 states have return successors, (35), 14 states have call predecessors, (35), 17 states have call successors, (35) [2022-11-16 19:43:21,054 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 302 transitions. [2022-11-16 19:43:21,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 443 [2022-11-16 19:43:21,059 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:21,059 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 25, 24, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 9, 9, 8, 7, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:21,069 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-11-16 19:43:21,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:21,265 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:21,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:21,265 INFO L85 PathProgramCache]: Analyzing trace with hash -771407987, now seen corresponding path program 6 times [2022-11-16 19:43:21,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:21,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704580229] [2022-11-16 19:43:21,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:21,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:21,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:21,904 INFO L134 CoverageAnalysis]: Checked inductivity of 5632 backedges. 217 proven. 869 refuted. 0 times theorem prover too weak. 4546 trivial. 0 not checked. [2022-11-16 19:43:21,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:21,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704580229] [2022-11-16 19:43:21,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704580229] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:21,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350301801] [2022-11-16 19:43:21,905 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:43:21,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:21,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:21,907 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:21,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-16 19:43:22,161 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:43:22,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:22,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-16 19:43:22,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:22,264 INFO L134 CoverageAnalysis]: Checked inductivity of 5632 backedges. 1138 proven. 6 refuted. 0 times theorem prover too weak. 4488 trivial. 0 not checked. [2022-11-16 19:43:22,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:23,770 INFO L134 CoverageAnalysis]: Checked inductivity of 5632 backedges. 242 proven. 712 refuted. 0 times theorem prover too weak. 4678 trivial. 0 not checked. [2022-11-16 19:43:23,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350301801] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:23,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [844842480] [2022-11-16 19:43:23,772 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:23,773 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:23,773 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 19:43:23,774 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:23,774 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 20 [2022-11-16 19:43:23,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122102992] [2022-11-16 19:43:23,775 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:23,776 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-16 19:43:23,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:23,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-16 19:43:23,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2022-11-16 19:43:23,777 INFO L87 Difference]: Start difference. First operand 181 states and 302 transitions. Second operand has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 20 states have internal predecessors, (81), 14 states have call successors, (24), 2 states have call predecessors, (24), 11 states have return successors, (31), 11 states have call predecessors, (31), 14 states have call successors, (31) [2022-11-16 19:43:24,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:24,531 INFO L93 Difference]: Finished difference Result 429 states and 867 transitions. [2022-11-16 19:43:24,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-16 19:43:24,532 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 20 states have internal predecessors, (81), 14 states have call successors, (24), 2 states have call predecessors, (24), 11 states have return successors, (31), 11 states have call predecessors, (31), 14 states have call successors, (31) Word has length 442 [2022-11-16 19:43:24,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:24,537 INFO L225 Difference]: With dead ends: 429 [2022-11-16 19:43:24,537 INFO L226 Difference]: Without dead ends: 262 [2022-11-16 19:43:24,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 918 GetRequests, 877 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=255, Invalid=1227, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 19:43:24,541 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 118 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:24,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 168 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 19:43:24,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2022-11-16 19:43:24,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 230. [2022-11-16 19:43:24,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 158 states have (on average 1.1898734177215189) internal successors, (188), 154 states have internal predecessors, (188), 47 states have call successors, (47), 31 states have call predecessors, (47), 24 states have return successors, (165), 44 states have call predecessors, (165), 47 states have call successors, (165) [2022-11-16 19:43:24,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 400 transitions. [2022-11-16 19:43:24,572 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 400 transitions. Word has length 442 [2022-11-16 19:43:24,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:24,573 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 400 transitions. [2022-11-16 19:43:24,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 20 states have internal predecessors, (81), 14 states have call successors, (24), 2 states have call predecessors, (24), 11 states have return successors, (31), 11 states have call predecessors, (31), 14 states have call successors, (31) [2022-11-16 19:43:24,573 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 400 transitions. [2022-11-16 19:43:24,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2022-11-16 19:43:24,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:24,577 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 27, 26, 26, 21, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 8, 5, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:24,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:24,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-16 19:43:24,784 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:24,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:24,784 INFO L85 PathProgramCache]: Analyzing trace with hash -604939659, now seen corresponding path program 1 times [2022-11-16 19:43:24,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:24,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033161276] [2022-11-16 19:43:24,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:24,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:24,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:25,211 INFO L134 CoverageAnalysis]: Checked inductivity of 3889 backedges. 249 proven. 532 refuted. 0 times theorem prover too weak. 3108 trivial. 0 not checked. [2022-11-16 19:43:25,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:25,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033161276] [2022-11-16 19:43:25,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033161276] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:25,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795372133] [2022-11-16 19:43:25,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:25,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:25,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:25,213 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:25,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-16 19:43:25,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:25,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-16 19:43:25,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:25,647 INFO L134 CoverageAnalysis]: Checked inductivity of 3889 backedges. 136 proven. 879 refuted. 0 times theorem prover too weak. 2874 trivial. 0 not checked. [2022-11-16 19:43:25,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:28,462 INFO L134 CoverageAnalysis]: Checked inductivity of 3889 backedges. 136 proven. 912 refuted. 0 times theorem prover too weak. 2841 trivial. 0 not checked. [2022-11-16 19:43:28,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795372133] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:28,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1268014104] [2022-11-16 19:43:28,464 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:28,464 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:28,465 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 19:43:28,465 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:28,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 19] total 25 [2022-11-16 19:43:28,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438920019] [2022-11-16 19:43:28,466 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:28,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-16 19:43:28,467 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:28,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-16 19:43:28,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2022-11-16 19:43:28,468 INFO L87 Difference]: Start difference. First operand 230 states and 400 transitions. Second operand has 25 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 25 states have internal predecessors, (82), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2022-11-16 19:43:28,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:28,946 INFO L93 Difference]: Finished difference Result 280 states and 543 transitions. [2022-11-16 19:43:28,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 19:43:28,947 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 25 states have internal predecessors, (82), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) Word has length 369 [2022-11-16 19:43:28,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:28,952 INFO L225 Difference]: With dead ends: 280 [2022-11-16 19:43:28,952 INFO L226 Difference]: Without dead ends: 256 [2022-11-16 19:43:28,953 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 721 SyntacticMatches, 8 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2022-11-16 19:43:28,954 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 96 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:28,954 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 155 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 19:43:28,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-16 19:43:28,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 241. [2022-11-16 19:43:28,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 165 states have (on average 1.1818181818181819) internal successors, (195), 161 states have internal predecessors, (195), 48 states have call successors, (48), 31 states have call predecessors, (48), 27 states have return successors, (175), 48 states have call predecessors, (175), 48 states have call successors, (175) [2022-11-16 19:43:28,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 418 transitions. [2022-11-16 19:43:28,987 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 418 transitions. Word has length 369 [2022-11-16 19:43:28,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:28,988 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 418 transitions. [2022-11-16 19:43:28,988 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 25 states have internal predecessors, (82), 21 states have call successors, (25), 1 states have call predecessors, (25), 12 states have return successors, (34), 13 states have call predecessors, (34), 21 states have call successors, (34) [2022-11-16 19:43:28,988 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 418 transitions. [2022-11-16 19:43:28,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 728 [2022-11-16 19:43:28,995 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:28,996 INFO L195 NwaCegarLoop]: trace histogram [54, 54, 51, 51, 50, 44, 27, 27, 27, 27, 27, 27, 27, 25, 25, 25, 25, 25, 25, 25, 23, 19, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:29,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:29,202 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-16 19:43:29,202 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:29,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:29,203 INFO L85 PathProgramCache]: Analyzing trace with hash -192034321, now seen corresponding path program 7 times [2022-11-16 19:43:29,203 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:29,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803201207] [2022-11-16 19:43:29,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:29,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:29,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:30,170 INFO L134 CoverageAnalysis]: Checked inductivity of 15599 backedges. 409 proven. 1509 refuted. 0 times theorem prover too weak. 13681 trivial. 0 not checked. [2022-11-16 19:43:30,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:30,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803201207] [2022-11-16 19:43:30,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803201207] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:30,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135161999] [2022-11-16 19:43:30,171 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:43:30,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:30,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:30,175 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:30,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-16 19:43:30,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:30,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 1637 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-16 19:43:30,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:30,826 INFO L134 CoverageAnalysis]: Checked inductivity of 15599 backedges. 291 proven. 2156 refuted. 0 times theorem prover too weak. 13152 trivial. 0 not checked. [2022-11-16 19:43:30,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:35,097 INFO L134 CoverageAnalysis]: Checked inductivity of 15599 backedges. 291 proven. 2200 refuted. 0 times theorem prover too weak. 13108 trivial. 0 not checked. [2022-11-16 19:43:35,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2135161999] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:35,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1505116326] [2022-11-16 19:43:35,100 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:35,100 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:35,100 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 19:43:35,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:35,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 21] total 27 [2022-11-16 19:43:35,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890702967] [2022-11-16 19:43:35,103 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:35,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-16 19:43:35,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:35,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-16 19:43:35,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=575, Unknown=0, NotChecked=0, Total=702 [2022-11-16 19:43:35,107 INFO L87 Difference]: Start difference. First operand 241 states and 418 transitions. Second operand has 27 states, 26 states have (on average 3.5) internal successors, (91), 27 states have internal predecessors, (91), 23 states have call successors, (27), 1 states have call predecessors, (27), 14 states have return successors, (38), 15 states have call predecessors, (38), 23 states have call successors, (38) [2022-11-16 19:43:35,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:35,603 INFO L93 Difference]: Finished difference Result 316 states and 660 transitions. [2022-11-16 19:43:35,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-16 19:43:35,604 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 27 states have internal predecessors, (91), 23 states have call successors, (27), 1 states have call predecessors, (27), 14 states have return successors, (38), 15 states have call predecessors, (38), 23 states have call successors, (38) Word has length 727 [2022-11-16 19:43:35,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:35,611 INFO L225 Difference]: With dead ends: 316 [2022-11-16 19:43:35,612 INFO L226 Difference]: Without dead ends: 292 [2022-11-16 19:43:35,613 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1482 GetRequests, 1434 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=310, Invalid=1250, Unknown=0, NotChecked=0, Total=1560 [2022-11-16 19:43:35,614 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 90 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 368 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:35,614 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 154 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 368 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 19:43:35,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-11-16 19:43:35,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 266. [2022-11-16 19:43:35,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 180 states have (on average 1.1666666666666667) internal successors, (210), 176 states have internal predecessors, (210), 53 states have call successors, (53), 31 states have call predecessors, (53), 32 states have return successors, (238), 58 states have call predecessors, (238), 53 states have call successors, (238) [2022-11-16 19:43:35,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 501 transitions. [2022-11-16 19:43:35,672 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 501 transitions. Word has length 727 [2022-11-16 19:43:35,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:35,673 INFO L495 AbstractCegarLoop]: Abstraction has 266 states and 501 transitions. [2022-11-16 19:43:35,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 27 states have internal predecessors, (91), 23 states have call successors, (27), 1 states have call predecessors, (27), 14 states have return successors, (38), 15 states have call predecessors, (38), 23 states have call successors, (38) [2022-11-16 19:43:35,673 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 501 transitions. [2022-11-16 19:43:35,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1261 [2022-11-16 19:43:35,701 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:35,702 INFO L195 NwaCegarLoop]: trace histogram [94, 94, 89, 89, 88, 71, 47, 47, 47, 47, 47, 47, 47, 44, 44, 44, 44, 44, 44, 44, 41, 27, 23, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:35,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:35,909 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-16 19:43:35,909 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:35,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:35,910 INFO L85 PathProgramCache]: Analyzing trace with hash -876825530, now seen corresponding path program 8 times [2022-11-16 19:43:35,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:35,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732888521] [2022-11-16 19:43:35,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:35,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:36,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:38,060 INFO L134 CoverageAnalysis]: Checked inductivity of 47569 backedges. 599 proven. 3336 refuted. 0 times theorem prover too weak. 43634 trivial. 0 not checked. [2022-11-16 19:43:38,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:38,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732888521] [2022-11-16 19:43:38,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1732888521] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:38,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858014782] [2022-11-16 19:43:38,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:43:38,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:38,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:38,067 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:38,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-16 19:43:38,473 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-16 19:43:38,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:38,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-16 19:43:38,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:38,579 INFO L134 CoverageAnalysis]: Checked inductivity of 47569 backedges. 10519 proven. 4 refuted. 0 times theorem prover too weak. 37046 trivial. 0 not checked. [2022-11-16 19:43:38,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:41,799 INFO L134 CoverageAnalysis]: Checked inductivity of 47569 backedges. 2673 proven. 171 refuted. 0 times theorem prover too weak. 44725 trivial. 0 not checked. [2022-11-16 19:43:41,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858014782] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:41,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1423639761] [2022-11-16 19:43:41,806 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:41,806 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:41,807 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 19:43:41,808 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:41,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7, 7] total 19 [2022-11-16 19:43:41,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358871318] [2022-11-16 19:43:41,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:41,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-16 19:43:41,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:41,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-16 19:43:41,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2022-11-16 19:43:41,814 INFO L87 Difference]: Start difference. First operand 266 states and 501 transitions. Second operand has 19 states, 18 states have (on average 4.333333333333333) internal successors, (78), 19 states have internal predecessors, (78), 12 states have call successors, (22), 2 states have call predecessors, (22), 12 states have return successors, (32), 11 states have call predecessors, (32), 12 states have call successors, (32) [2022-11-16 19:43:42,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:42,328 INFO L93 Difference]: Finished difference Result 534 states and 1173 transitions. [2022-11-16 19:43:42,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-16 19:43:42,329 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 4.333333333333333) internal successors, (78), 19 states have internal predecessors, (78), 12 states have call successors, (22), 2 states have call predecessors, (22), 12 states have return successors, (32), 11 states have call predecessors, (32), 12 states have call successors, (32) Word has length 1260 [2022-11-16 19:43:42,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:42,336 INFO L225 Difference]: With dead ends: 534 [2022-11-16 19:43:42,336 INFO L226 Difference]: Without dead ends: 271 [2022-11-16 19:43:42,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2550 GetRequests, 2517 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2022-11-16 19:43:42,341 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 127 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:42,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 119 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 19:43:42,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2022-11-16 19:43:42,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 251. [2022-11-16 19:43:42,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 171 states have (on average 1.1812865497076024) internal successors, (202), 168 states have internal predecessors, (202), 50 states have call successors, (50), 31 states have call predecessors, (50), 29 states have return successors, (215), 51 states have call predecessors, (215), 50 states have call successors, (215) [2022-11-16 19:43:42,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 467 transitions. [2022-11-16 19:43:42,380 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 467 transitions. Word has length 1260 [2022-11-16 19:43:42,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:42,381 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 467 transitions. [2022-11-16 19:43:42,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 4.333333333333333) internal successors, (78), 19 states have internal predecessors, (78), 12 states have call successors, (22), 2 states have call predecessors, (22), 12 states have return successors, (32), 11 states have call predecessors, (32), 12 states have call successors, (32) [2022-11-16 19:43:42,382 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 467 transitions. [2022-11-16 19:43:42,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1509 [2022-11-16 19:43:42,412 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:42,412 INFO L195 NwaCegarLoop]: trace histogram [111, 111, 110, 110, 91, 88, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 55, 36, 33, 22, 20, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:42,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-16 19:43:42,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:42,618 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:42,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:42,619 INFO L85 PathProgramCache]: Analyzing trace with hash -876241359, now seen corresponding path program 9 times [2022-11-16 19:43:42,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:42,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041324383] [2022-11-16 19:43:42,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:42,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:42,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:45,246 INFO L134 CoverageAnalysis]: Checked inductivity of 68203 backedges. 1010 proven. 3721 refuted. 0 times theorem prover too weak. 63472 trivial. 0 not checked. [2022-11-16 19:43:45,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:45,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041324383] [2022-11-16 19:43:45,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041324383] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:45,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791586160] [2022-11-16 19:43:45,247 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:43:45,247 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:45,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:45,248 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:45,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-16 19:43:45,837 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:43:45,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:43:45,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 2683 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-16 19:43:45,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:46,111 INFO L134 CoverageAnalysis]: Checked inductivity of 68203 backedges. 19158 proven. 427 refuted. 0 times theorem prover too weak. 48618 trivial. 0 not checked. [2022-11-16 19:43:46,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:43:52,897 INFO L134 CoverageAnalysis]: Checked inductivity of 68203 backedges. 1085 proven. 6099 refuted. 0 times theorem prover too weak. 61019 trivial. 0 not checked. [2022-11-16 19:43:52,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791586160] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:43:52,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1595394362] [2022-11-16 19:43:52,900 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:43:52,900 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:43:52,901 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 19:43:52,902 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:43:52,902 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 23] total 32 [2022-11-16 19:43:52,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470291582] [2022-11-16 19:43:52,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:43:52,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-16 19:43:52,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:43:52,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-16 19:43:52,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=883, Unknown=0, NotChecked=0, Total=992 [2022-11-16 19:43:52,906 INFO L87 Difference]: Start difference. First operand 251 states and 467 transitions. Second operand has 32 states, 31 states have (on average 3.870967741935484) internal successors, (120), 32 states have internal predecessors, (120), 27 states have call successors, (37), 2 states have call predecessors, (37), 16 states have return successors, (48), 16 states have call predecessors, (48), 27 states have call successors, (48) [2022-11-16 19:43:54,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:43:54,633 INFO L93 Difference]: Finished difference Result 527 states and 1168 transitions. [2022-11-16 19:43:54,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-16 19:43:54,635 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 3.870967741935484) internal successors, (120), 32 states have internal predecessors, (120), 27 states have call successors, (37), 2 states have call predecessors, (37), 16 states have return successors, (48), 16 states have call predecessors, (48), 27 states have call successors, (48) Word has length 1508 [2022-11-16 19:43:54,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:43:54,640 INFO L225 Difference]: With dead ends: 527 [2022-11-16 19:43:54,640 INFO L226 Difference]: Without dead ends: 286 [2022-11-16 19:43:54,645 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3071 GetRequests, 2992 SyntacticMatches, 11 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=698, Invalid=4132, Unknown=0, NotChecked=0, Total=4830 [2022-11-16 19:43:54,645 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 224 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 1421 mSolverCounterSat, 408 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 1829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 408 IncrementalHoareTripleChecker+Valid, 1421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-16 19:43:54,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [225 Valid, 332 Invalid, 1829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [408 Valid, 1421 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-16 19:43:54,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-11-16 19:43:54,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 252. [2022-11-16 19:43:54,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 173 states have (on average 1.115606936416185) internal successors, (193), 171 states have internal predecessors, (193), 52 states have call successors, (52), 34 states have call predecessors, (52), 26 states have return successors, (186), 46 states have call predecessors, (186), 52 states have call successors, (186) [2022-11-16 19:43:54,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 431 transitions. [2022-11-16 19:43:54,672 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 431 transitions. Word has length 1508 [2022-11-16 19:43:54,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:43:54,673 INFO L495 AbstractCegarLoop]: Abstraction has 252 states and 431 transitions. [2022-11-16 19:43:54,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 3.870967741935484) internal successors, (120), 32 states have internal predecessors, (120), 27 states have call successors, (37), 2 states have call predecessors, (37), 16 states have return successors, (48), 16 states have call predecessors, (48), 27 states have call successors, (48) [2022-11-16 19:43:54,674 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 431 transitions. [2022-11-16 19:43:54,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1468 [2022-11-16 19:43:54,692 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:43:54,693 INFO L195 NwaCegarLoop]: trace histogram [108, 108, 107, 107, 88, 86, 54, 54, 54, 54, 54, 54, 54, 53, 53, 53, 53, 53, 53, 53, 35, 32, 21, 20, 1, 1, 1, 1, 1, 1] [2022-11-16 19:43:54,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-16 19:43:54,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-16 19:43:54,901 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:43:54,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:43:54,902 INFO L85 PathProgramCache]: Analyzing trace with hash 858111874, now seen corresponding path program 10 times [2022-11-16 19:43:54,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:43:54,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483104920] [2022-11-16 19:43:54,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:43:54,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:43:55,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:57,260 INFO L134 CoverageAnalysis]: Checked inductivity of 64515 backedges. 1442 proven. 3357 refuted. 0 times theorem prover too weak. 59716 trivial. 0 not checked. [2022-11-16 19:43:57,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:43:57,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483104920] [2022-11-16 19:43:57,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483104920] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:43:57,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235871014] [2022-11-16 19:43:57,261 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:43:57,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:43:57,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:43:57,266 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:43:57,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-16 19:43:58,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:43:58,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 3282 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-16 19:43:58,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:43:58,257 INFO L134 CoverageAnalysis]: Checked inductivity of 64515 backedges. 1669 proven. 4274 refuted. 0 times theorem prover too weak. 58572 trivial. 0 not checked. [2022-11-16 19:43:58,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:44:05,298 INFO L134 CoverageAnalysis]: Checked inductivity of 64515 backedges. 1671 proven. 4324 refuted. 0 times theorem prover too weak. 58520 trivial. 0 not checked. [2022-11-16 19:44:05,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235871014] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:44:05,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [540991967] [2022-11-16 19:44:05,300 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:44:05,301 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:44:05,301 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 19:44:05,302 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:44:05,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 23] total 29 [2022-11-16 19:44:05,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37832222] [2022-11-16 19:44:05,304 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:44:05,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-16 19:44:05,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:44:05,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-16 19:44:05,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=671, Unknown=0, NotChecked=0, Total=812 [2022-11-16 19:44:05,308 INFO L87 Difference]: Start difference. First operand 252 states and 431 transitions. Second operand has 29 states, 28 states have (on average 3.357142857142857) internal successors, (94), 29 states have internal predecessors, (94), 23 states have call successors, (30), 1 states have call predecessors, (30), 12 states have return successors, (38), 16 states have call predecessors, (38), 23 states have call successors, (38) [2022-11-16 19:44:05,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:44:05,816 INFO L93 Difference]: Finished difference Result 297 states and 569 transitions. [2022-11-16 19:44:05,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 19:44:05,817 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.357142857142857) internal successors, (94), 29 states have internal predecessors, (94), 23 states have call successors, (30), 1 states have call predecessors, (30), 12 states have return successors, (38), 16 states have call predecessors, (38), 23 states have call successors, (38) Word has length 1467 [2022-11-16 19:44:05,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:44:05,823 INFO L225 Difference]: With dead ends: 297 [2022-11-16 19:44:05,823 INFO L226 Difference]: Without dead ends: 247 [2022-11-16 19:44:05,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2963 GetRequests, 2915 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=290, Invalid=1192, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 19:44:05,825 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 52 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 19:44:05,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 343 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 531 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 19:44:05,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2022-11-16 19:44:05,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2022-11-16 19:44:05,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 170 states have (on average 1.1176470588235294) internal successors, (190), 168 states have internal predecessors, (190), 51 states have call successors, (51), 34 states have call predecessors, (51), 25 states have return successors, (156), 44 states have call predecessors, (156), 51 states have call successors, (156) [2022-11-16 19:44:05,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 397 transitions. [2022-11-16 19:44:05,849 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 397 transitions. Word has length 1467 [2022-11-16 19:44:05,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:44:05,850 INFO L495 AbstractCegarLoop]: Abstraction has 247 states and 397 transitions. [2022-11-16 19:44:05,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.357142857142857) internal successors, (94), 29 states have internal predecessors, (94), 23 states have call successors, (30), 1 states have call predecessors, (30), 12 states have return successors, (38), 16 states have call predecessors, (38), 23 states have call successors, (38) [2022-11-16 19:44:05,850 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 397 transitions. [2022-11-16 19:44:05,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1495 [2022-11-16 19:44:05,869 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:44:05,869 INFO L195 NwaCegarLoop]: trace histogram [110, 110, 109, 109, 89, 88, 55, 55, 55, 55, 55, 55, 55, 54, 54, 54, 54, 54, 54, 54, 34, 34, 22, 20, 1, 1, 1, 1, 1, 1] [2022-11-16 19:44:05,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-16 19:44:06,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-16 19:44:06,079 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:44:06,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:44:06,079 INFO L85 PathProgramCache]: Analyzing trace with hash 1452040778, now seen corresponding path program 11 times [2022-11-16 19:44:06,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:44:06,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063459957] [2022-11-16 19:44:06,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:44:06,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:44:06,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:44:08,635 INFO L134 CoverageAnalysis]: Checked inductivity of 66932 backedges. 917 proven. 5145 refuted. 0 times theorem prover too weak. 60870 trivial. 0 not checked. [2022-11-16 19:44:08,635 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:44:08,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063459957] [2022-11-16 19:44:08,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063459957] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:44:08,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207244764] [2022-11-16 19:44:08,636 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:44:08,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:44:08,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:44:08,639 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:44:08,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-16 19:44:09,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2022-11-16 19:44:09,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:44:09,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 1423 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-16 19:44:09,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:44:09,549 INFO L134 CoverageAnalysis]: Checked inductivity of 66932 backedges. 925 proven. 5133 refuted. 0 times theorem prover too weak. 60874 trivial. 0 not checked. [2022-11-16 19:44:09,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:44:17,454 INFO L134 CoverageAnalysis]: Checked inductivity of 66932 backedges. 921 proven. 5189 refuted. 0 times theorem prover too weak. 60822 trivial. 0 not checked. [2022-11-16 19:44:17,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207244764] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:44:17,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1697069323] [2022-11-16 19:44:17,457 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:44:17,457 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:44:17,457 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 19:44:17,458 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:44:17,459 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 24] total 30 [2022-11-16 19:44:17,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797100315] [2022-11-16 19:44:17,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:44:17,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-16 19:44:17,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:44:17,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-16 19:44:17,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=714, Unknown=0, NotChecked=0, Total=870 [2022-11-16 19:44:17,463 INFO L87 Difference]: Start difference. First operand 247 states and 397 transitions. Second operand has 30 states, 29 states have (on average 3.1724137931034484) internal successors, (92), 30 states have internal predecessors, (92), 24 states have call successors, (29), 1 states have call predecessors, (29), 11 states have return successors, (36), 13 states have call predecessors, (36), 24 states have call successors, (36) [2022-11-16 19:44:17,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:44:17,966 INFO L93 Difference]: Finished difference Result 303 states and 543 transitions. [2022-11-16 19:44:17,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-16 19:44:17,966 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 3.1724137931034484) internal successors, (92), 30 states have internal predecessors, (92), 24 states have call successors, (29), 1 states have call predecessors, (29), 11 states have return successors, (36), 13 states have call predecessors, (36), 24 states have call successors, (36) Word has length 1494 [2022-11-16 19:44:17,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:44:17,974 INFO L225 Difference]: With dead ends: 303 [2022-11-16 19:44:17,974 INFO L226 Difference]: Without dead ends: 237 [2022-11-16 19:44:17,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3020 GetRequests, 2972 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 519 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=293, Invalid=1189, Unknown=0, NotChecked=0, Total=1482 [2022-11-16 19:44:17,976 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 39 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 607 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 607 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-16 19:44:17,977 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 380 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 607 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-16 19:44:17,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-11-16 19:44:17,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 234. [2022-11-16 19:44:17,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 162 states have (on average 1.123456790123457) internal successors, (182), 160 states have internal predecessors, (182), 47 states have call successors, (47), 33 states have call predecessors, (47), 24 states have return successors, (113), 40 states have call predecessors, (113), 47 states have call successors, (113) [2022-11-16 19:44:17,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 342 transitions. [2022-11-16 19:44:17,999 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 342 transitions. Word has length 1494 [2022-11-16 19:44:18,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:44:18,002 INFO L495 AbstractCegarLoop]: Abstraction has 234 states and 342 transitions. [2022-11-16 19:44:18,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 3.1724137931034484) internal successors, (92), 30 states have internal predecessors, (92), 24 states have call successors, (29), 1 states have call predecessors, (29), 11 states have return successors, (36), 13 states have call predecessors, (36), 24 states have call successors, (36) [2022-11-16 19:44:18,003 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 342 transitions. [2022-11-16 19:44:18,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1386 [2022-11-16 19:44:18,019 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:44:18,020 INFO L195 NwaCegarLoop]: trace histogram [102, 102, 101, 101, 82, 82, 51, 51, 51, 51, 51, 51, 51, 50, 50, 50, 50, 50, 50, 50, 32, 31, 20, 19, 1, 1, 1, 1, 1, 1] [2022-11-16 19:44:18,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-16 19:44:18,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:44:18,228 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:44:18,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:44:18,228 INFO L85 PathProgramCache]: Analyzing trace with hash -325460622, now seen corresponding path program 12 times [2022-11-16 19:44:18,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:44:18,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323230401] [2022-11-16 19:44:18,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:44:18,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:44:18,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:44:19,941 INFO L134 CoverageAnalysis]: Checked inductivity of 57446 backedges. 2879 proven. 1640 refuted. 0 times theorem prover too weak. 52927 trivial. 0 not checked. [2022-11-16 19:44:19,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:44:19,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323230401] [2022-11-16 19:44:19,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323230401] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:44:19,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852640589] [2022-11-16 19:44:19,943 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:44:19,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:44:19,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:44:19,945 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:44:19,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-16 19:44:20,632 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:44:20,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:44:20,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 2464 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-16 19:44:20,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:44:21,107 INFO L134 CoverageAnalysis]: Checked inductivity of 57446 backedges. 3450 proven. 6316 refuted. 0 times theorem prover too weak. 47680 trivial. 0 not checked. [2022-11-16 19:44:21,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:44:31,516 INFO L134 CoverageAnalysis]: Checked inductivity of 57446 backedges. 3450 proven. 6400 refuted. 0 times theorem prover too weak. 47596 trivial. 0 not checked. [2022-11-16 19:44:31,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852640589] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:44:31,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1428946048] [2022-11-16 19:44:31,517 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:44:31,517 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:44:31,518 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 19:44:31,519 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:44:31,519 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 25, 39] total 49 [2022-11-16 19:44:31,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859722227] [2022-11-16 19:44:31,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:44:31,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-16 19:44:31,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:44:31,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-16 19:44:31,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=2122, Unknown=0, NotChecked=0, Total=2352 [2022-11-16 19:44:31,524 INFO L87 Difference]: Start difference. First operand 234 states and 342 transitions. Second operand has 49 states, 48 states have (on average 3.1458333333333335) internal successors, (151), 49 states have internal predecessors, (151), 40 states have call successors, (46), 1 states have call predecessors, (46), 22 states have return successors, (61), 23 states have call predecessors, (61), 40 states have call successors, (61) [2022-11-16 19:44:34,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:44:34,199 INFO L93 Difference]: Finished difference Result 569 states and 937 transitions. [2022-11-16 19:44:34,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-16 19:44:34,200 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 3.1458333333333335) internal successors, (151), 49 states have internal predecessors, (151), 40 states have call successors, (46), 1 states have call predecessors, (46), 22 states have return successors, (61), 23 states have call predecessors, (61), 40 states have call successors, (61) Word has length 1385 [2022-11-16 19:44:34,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:44:34,208 INFO L225 Difference]: With dead ends: 569 [2022-11-16 19:44:34,208 INFO L226 Difference]: Without dead ends: 325 [2022-11-16 19:44:34,212 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2834 GetRequests, 2723 SyntacticMatches, 19 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2508 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1181, Invalid=7561, Unknown=0, NotChecked=0, Total=8742 [2022-11-16 19:44:34,215 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 290 mSDsluCounter, 606 mSDsCounter, 0 mSdLazyCounter, 2363 mSolverCounterSat, 429 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 660 SdHoareTripleChecker+Invalid, 2792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 429 IncrementalHoareTripleChecker+Valid, 2363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-16 19:44:34,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [291 Valid, 660 Invalid, 2792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [429 Valid, 2363 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-16 19:44:34,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2022-11-16 19:44:34,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 249. [2022-11-16 19:44:34,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 175 states have (on average 1.1028571428571428) internal successors, (193), 172 states have internal predecessors, (193), 51 states have call successors, (51), 39 states have call predecessors, (51), 22 states have return successors, (76), 37 states have call predecessors, (76), 51 states have call successors, (76) [2022-11-16 19:44:34,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 320 transitions. [2022-11-16 19:44:34,245 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 320 transitions. Word has length 1385 [2022-11-16 19:44:34,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:44:34,246 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 320 transitions. [2022-11-16 19:44:34,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 3.1458333333333335) internal successors, (151), 49 states have internal predecessors, (151), 40 states have call successors, (46), 1 states have call predecessors, (46), 22 states have return successors, (61), 23 states have call predecessors, (61), 40 states have call successors, (61) [2022-11-16 19:44:34,247 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 320 transitions. [2022-11-16 19:44:34,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1318 [2022-11-16 19:44:34,261 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:44:34,262 INFO L195 NwaCegarLoop]: trace histogram [97, 97, 96, 96, 79, 77, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 31, 29, 19, 18, 1, 1, 1, 1, 1, 1] [2022-11-16 19:44:34,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-16 19:44:34,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:44:34,471 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:44:34,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:44:34,472 INFO L85 PathProgramCache]: Analyzing trace with hash -872479903, now seen corresponding path program 13 times [2022-11-16 19:44:34,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:44:34,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816123388] [2022-11-16 19:44:34,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:44:34,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:44:34,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:44:35,953 INFO L134 CoverageAnalysis]: Checked inductivity of 51895 backedges. 3038 proven. 733 refuted. 0 times theorem prover too weak. 48124 trivial. 0 not checked. [2022-11-16 19:44:35,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:44:35,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816123388] [2022-11-16 19:44:35,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [816123388] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:44:35,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400508336] [2022-11-16 19:44:35,954 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:44:35,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:44:35,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:44:35,955 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:44:35,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-16 19:44:36,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:44:36,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 2949 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-16 19:44:36,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:44:36,997 INFO L134 CoverageAnalysis]: Checked inductivity of 51895 backedges. 3747 proven. 879 refuted. 0 times theorem prover too weak. 47269 trivial. 0 not checked. [2022-11-16 19:44:36,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:44:42,601 INFO L134 CoverageAnalysis]: Checked inductivity of 51895 backedges. 3747 proven. 919 refuted. 0 times theorem prover too weak. 47229 trivial. 0 not checked. [2022-11-16 19:44:42,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400508336] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:44:42,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1686981663] [2022-11-16 19:44:42,604 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:44:42,605 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:44:42,605 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 19:44:42,605 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:44:42,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 21] total 27 [2022-11-16 19:44:42,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007519378] [2022-11-16 19:44:42,606 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:44:42,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-16 19:44:42,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:44:42,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-16 19:44:42,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=575, Unknown=0, NotChecked=0, Total=702 [2022-11-16 19:44:42,608 INFO L87 Difference]: Start difference. First operand 249 states and 320 transitions. Second operand has 27 states, 26 states have (on average 3.3461538461538463) internal successors, (87), 27 states have internal predecessors, (87), 19 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (34), 16 states have call predecessors, (34), 19 states have call successors, (34) [2022-11-16 19:44:43,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:44:43,039 INFO L93 Difference]: Finished difference Result 259 states and 329 transitions. [2022-11-16 19:44:43,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-16 19:44:43,040 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.3461538461538463) internal successors, (87), 27 states have internal predecessors, (87), 19 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (34), 16 states have call predecessors, (34), 19 states have call successors, (34) Word has length 1317 [2022-11-16 19:44:43,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:44:43,043 INFO L225 Difference]: With dead ends: 259 [2022-11-16 19:44:43,043 INFO L226 Difference]: Without dead ends: 244 [2022-11-16 19:44:43,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2660 GetRequests, 2616 SyntacticMatches, 10 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=255, Invalid=1005, Unknown=0, NotChecked=0, Total=1260 [2022-11-16 19:44:43,044 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 50 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-16 19:44:43,044 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 337 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-16 19:44:43,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-11-16 19:44:43,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2022-11-16 19:44:43,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 172 states have (on average 1.1046511627906976) internal successors, (190), 169 states have internal predecessors, (190), 50 states have call successors, (50), 39 states have call predecessors, (50), 21 states have return successors, (61), 35 states have call predecessors, (61), 50 states have call successors, (61) [2022-11-16 19:44:43,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 301 transitions. [2022-11-16 19:44:43,068 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 301 transitions. Word has length 1317 [2022-11-16 19:44:43,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:44:43,069 INFO L495 AbstractCegarLoop]: Abstraction has 244 states and 301 transitions. [2022-11-16 19:44:43,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.3461538461538463) internal successors, (87), 27 states have internal predecessors, (87), 19 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (34), 16 states have call predecessors, (34), 19 states have call successors, (34) [2022-11-16 19:44:43,070 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 301 transitions. [2022-11-16 19:44:43,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1209 [2022-11-16 19:44:43,082 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:44:43,082 INFO L195 NwaCegarLoop]: trace histogram [89, 89, 88, 88, 72, 71, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 28, 27, 17, 17, 1, 1, 1, 1, 1, 1] [2022-11-16 19:44:43,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-16 19:44:43,292 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-16 19:44:43,292 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:44:43,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:44:43,292 INFO L85 PathProgramCache]: Analyzing trace with hash 529873829, now seen corresponding path program 14 times [2022-11-16 19:44:43,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:44:43,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290300259] [2022-11-16 19:44:43,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:44:43,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:44:43,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:45:36,716 INFO L134 CoverageAnalysis]: Checked inductivity of 43585 backedges. 0 proven. 14453 refuted. 0 times theorem prover too weak. 29132 trivial. 0 not checked. [2022-11-16 19:45:36,716 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:45:36,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290300259] [2022-11-16 19:45:36,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290300259] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:45:36,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117994934] [2022-11-16 19:45:36,717 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-16 19:45:36,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:45:36,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:45:36,719 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:45:36,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-16 19:45:37,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 77 check-sat command(s) [2022-11-16 19:45:37,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:45:37,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 2707 conjuncts, 711 conjunts are in the unsatisfiable core [2022-11-16 19:45:37,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:45:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 43585 backedges. 0 proven. 14453 refuted. 0 times theorem prover too weak. 29132 trivial. 0 not checked. [2022-11-16 19:45:41,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:45:53,626 INFO L134 CoverageAnalysis]: Checked inductivity of 43585 backedges. 0 proven. 14453 refuted. 0 times theorem prover too weak. 29132 trivial. 0 not checked. [2022-11-16 19:45:53,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117994934] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:45:53,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2065404861] [2022-11-16 19:45:53,628 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:45:53,628 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:45:53,628 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 19:45:53,628 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:45:53,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 68 [2022-11-16 19:45:53,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983024886] [2022-11-16 19:45:53,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:45:53,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-11-16 19:45:53,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:45:53,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-11-16 19:45:53,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=4391, Unknown=0, NotChecked=0, Total=4556 [2022-11-16 19:45:53,635 INFO L87 Difference]: Start difference. First operand 244 states and 301 transitions. Second operand has 68 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 35 states have internal predecessors, (78), 15 states have call successors, (17), 1 states have call predecessors, (17), 18 states have return successors, (47), 47 states have call predecessors, (47), 15 states have call successors, (47) [2022-11-16 19:45:55,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:45:55,117 INFO L93 Difference]: Finished difference Result 265 states and 325 transitions. [2022-11-16 19:45:55,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-16 19:45:55,118 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 35 states have internal predecessors, (78), 15 states have call successors, (17), 1 states have call predecessors, (17), 18 states have return successors, (47), 47 states have call predecessors, (47), 15 states have call successors, (47) Word has length 1208 [2022-11-16 19:45:55,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:45:55,121 INFO L225 Difference]: With dead ends: 265 [2022-11-16 19:45:55,121 INFO L226 Difference]: Without dead ends: 258 [2022-11-16 19:45:55,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2771 GetRequests, 2415 SyntacticMatches, 290 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1269 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=165, Invalid=4391, Unknown=0, NotChecked=0, Total=4556 [2022-11-16 19:45:55,123 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 0 mSDsluCounter, 3800 mSDsCounter, 0 mSdLazyCounter, 2746 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 3884 SdHoareTripleChecker+Invalid, 2746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2746 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-16 19:45:55,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 3884 Invalid, 2746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2746 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-16 19:45:55,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2022-11-16 19:45:55,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 257. [2022-11-16 19:45:55,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 180 states have (on average 1.1) internal successors, (198), 177 states have internal predecessors, (198), 52 states have call successors, (52), 39 states have call predecessors, (52), 24 states have return successors, (67), 40 states have call predecessors, (67), 52 states have call successors, (67) [2022-11-16 19:45:55,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 317 transitions. [2022-11-16 19:45:55,146 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 317 transitions. Word has length 1208 [2022-11-16 19:45:55,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:45:55,148 INFO L495 AbstractCegarLoop]: Abstraction has 257 states and 317 transitions. [2022-11-16 19:45:55,148 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 35 states have internal predecessors, (78), 15 states have call successors, (17), 1 states have call predecessors, (17), 18 states have return successors, (47), 47 states have call predecessors, (47), 15 states have call successors, (47) [2022-11-16 19:45:55,148 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 317 transitions. [2022-11-16 19:45:55,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1291 [2022-11-16 19:45:55,162 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:45:55,163 INFO L195 NwaCegarLoop]: trace histogram [96, 96, 93, 93, 77, 76, 48, 48, 48, 48, 48, 48, 48, 46, 46, 46, 46, 46, 46, 46, 31, 28, 19, 17, 1, 1, 1, 1, 1, 1] [2022-11-16 19:45:55,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-16 19:45:55,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-16 19:45:55,373 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:45:55,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:45:55,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1331848195, now seen corresponding path program 15 times [2022-11-16 19:45:55,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:45:55,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890948138] [2022-11-16 19:45:55,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:45:55,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:45:55,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:45:57,320 INFO L134 CoverageAnalysis]: Checked inductivity of 49780 backedges. 1857 proven. 1830 refuted. 0 times theorem prover too weak. 46093 trivial. 0 not checked. [2022-11-16 19:45:57,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:45:57,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890948138] [2022-11-16 19:45:57,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [890948138] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:45:57,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452113179] [2022-11-16 19:45:57,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-16 19:45:57,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:45:57,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:45:57,323 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:45:57,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-16 19:45:58,286 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-16 19:45:58,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-16 19:45:58,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 2295 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-16 19:45:58,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:45:58,728 INFO L134 CoverageAnalysis]: Checked inductivity of 49780 backedges. 25888 proven. 2428 refuted. 0 times theorem prover too weak. 21464 trivial. 0 not checked. [2022-11-16 19:45:58,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:46:07,045 INFO L134 CoverageAnalysis]: Checked inductivity of 49780 backedges. 2307 proven. 5665 refuted. 0 times theorem prover too weak. 41808 trivial. 0 not checked. [2022-11-16 19:46:07,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452113179] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:46:07,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604488216] [2022-11-16 19:46:07,048 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:46:07,048 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:46:07,048 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 19:46:07,049 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:46:07,050 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 22, 33] total 44 [2022-11-16 19:46:07,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721802626] [2022-11-16 19:46:07,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:46:07,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-16 19:46:07,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:46:07,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-16 19:46:07,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1698, Unknown=0, NotChecked=0, Total=1892 [2022-11-16 19:46:07,053 INFO L87 Difference]: Start difference. First operand 257 states and 317 transitions. Second operand has 44 states, 43 states have (on average 3.511627906976744) internal successors, (151), 44 states have internal predecessors, (151), 35 states have call successors, (47), 2 states have call predecessors, (47), 20 states have return successors, (61), 23 states have call predecessors, (61), 35 states have call successors, (61) [2022-11-16 19:46:08,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:46:08,751 INFO L93 Difference]: Finished difference Result 477 states and 589 transitions. [2022-11-16 19:46:08,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-16 19:46:08,752 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 3.511627906976744) internal successors, (151), 44 states have internal predecessors, (151), 35 states have call successors, (47), 2 states have call predecessors, (47), 20 states have return successors, (61), 23 states have call predecessors, (61), 35 states have call successors, (61) Word has length 1290 [2022-11-16 19:46:08,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:46:08,755 INFO L225 Difference]: With dead ends: 477 [2022-11-16 19:46:08,755 INFO L226 Difference]: Without dead ends: 276 [2022-11-16 19:46:08,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2634 GetRequests, 2539 SyntacticMatches, 16 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1790 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=926, Invalid=5554, Unknown=0, NotChecked=0, Total=6480 [2022-11-16 19:46:08,759 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 314 mSDsluCounter, 425 mSDsCounter, 0 mSdLazyCounter, 1359 mSolverCounterSat, 367 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 1726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 367 IncrementalHoareTripleChecker+Valid, 1359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-16 19:46:08,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [315 Valid, 466 Invalid, 1726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [367 Valid, 1359 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-16 19:46:08,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2022-11-16 19:46:08,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 256. [2022-11-16 19:46:08,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 182 states have (on average 1.0879120879120878) internal successors, (198), 177 states have internal predecessors, (198), 51 states have call successors, (51), 42 states have call predecessors, (51), 22 states have return successors, (62), 36 states have call predecessors, (62), 51 states have call successors, (62) [2022-11-16 19:46:08,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 311 transitions. [2022-11-16 19:46:08,781 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 311 transitions. Word has length 1290 [2022-11-16 19:46:08,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:46:08,782 INFO L495 AbstractCegarLoop]: Abstraction has 256 states and 311 transitions. [2022-11-16 19:46:08,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 3.511627906976744) internal successors, (151), 44 states have internal predecessors, (151), 35 states have call successors, (47), 2 states have call predecessors, (47), 20 states have return successors, (61), 23 states have call predecessors, (61), 35 states have call successors, (61) [2022-11-16 19:46:08,783 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 311 transitions. [2022-11-16 19:46:08,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1250 [2022-11-16 19:46:08,796 INFO L187 NwaCegarLoop]: Found error trace [2022-11-16 19:46:08,796 INFO L195 NwaCegarLoop]: trace histogram [92, 92, 91, 91, 74, 74, 46, 46, 46, 46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 45, 29, 28, 18, 17, 1, 1, 1, 1, 1, 1] [2022-11-16 19:46:08,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-16 19:46:09,006 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:46:09,007 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-16 19:46:09,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-16 19:46:09,007 INFO L85 PathProgramCache]: Analyzing trace with hash -607291006, now seen corresponding path program 16 times [2022-11-16 19:46:09,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-16 19:46:09,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970667312] [2022-11-16 19:46:09,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-16 19:46:09,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-16 19:46:09,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:46:10,594 INFO L134 CoverageAnalysis]: Checked inductivity of 46626 backedges. 2712 proven. 854 refuted. 0 times theorem prover too weak. 43060 trivial. 0 not checked. [2022-11-16 19:46:10,594 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-16 19:46:10,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970667312] [2022-11-16 19:46:10,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [970667312] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-16 19:46:10,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953722580] [2022-11-16 19:46:10,594 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-16 19:46:10,594 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-16 19:46:10,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 [2022-11-16 19:46:10,595 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-16 19:46:10,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-16 19:46:11,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-16 19:46:11,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 2798 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-16 19:46:11,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-16 19:46:11,710 INFO L134 CoverageAnalysis]: Checked inductivity of 46626 backedges. 3342 proven. 1027 refuted. 0 times theorem prover too weak. 42257 trivial. 0 not checked. [2022-11-16 19:46:11,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-16 19:46:17,129 INFO L134 CoverageAnalysis]: Checked inductivity of 46626 backedges. 3342 proven. 1069 refuted. 0 times theorem prover too weak. 42215 trivial. 0 not checked. [2022-11-16 19:46:17,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953722580] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-16 19:46:17,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786967610] [2022-11-16 19:46:17,132 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-16 19:46:17,132 INFO L166 IcfgInterpreter]: Building call graph [2022-11-16 19:46:17,132 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 19:46:17,132 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-16 19:46:17,133 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 21] total 27 [2022-11-16 19:46:17,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537093483] [2022-11-16 19:46:17,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-16 19:46:17,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-16 19:46:17,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-16 19:46:17,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-16 19:46:17,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=575, Unknown=0, NotChecked=0, Total=702 [2022-11-16 19:46:17,136 INFO L87 Difference]: Start difference. First operand 256 states and 311 transitions. Second operand has 27 states, 26 states have (on average 3.3461538461538463) internal successors, (87), 27 states have internal predecessors, (87), 19 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (34), 16 states have call predecessors, (34), 19 states have call successors, (34) [2022-11-16 19:46:17,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-16 19:46:17,485 INFO L93 Difference]: Finished difference Result 256 states and 311 transitions. [2022-11-16 19:46:17,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-16 19:46:17,486 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.3461538461538463) internal successors, (87), 27 states have internal predecessors, (87), 19 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (34), 16 states have call predecessors, (34), 19 states have call successors, (34) Word has length 1249 [2022-11-16 19:46:17,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-16 19:46:17,488 INFO L225 Difference]: With dead ends: 256 [2022-11-16 19:46:17,488 INFO L226 Difference]: Without dead ends: 0 [2022-11-16 19:46:17,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2524 GetRequests, 2480 SyntacticMatches, 10 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=255, Invalid=1005, Unknown=0, NotChecked=0, Total=1260 [2022-11-16 19:46:17,492 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 44 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-16 19:46:17,492 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 287 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-16 19:46:17,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-11-16 19:46:17,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-11-16 19:46:17,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-16 19:46:17,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-11-16 19:46:17,494 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 1249 [2022-11-16 19:46:17,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-16 19:46:17,495 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-11-16 19:46:17,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.3461538461538463) internal successors, (87), 27 states have internal predecessors, (87), 19 states have call successors, (27), 1 states have call predecessors, (27), 11 states have return successors, (34), 16 states have call predecessors, (34), 19 states have call successors, (34) [2022-11-16 19:46:17,495 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-11-16 19:46:17,495 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-11-16 19:46:17,503 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-16 19:46:17,512 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-16 19:46:17,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-16 19:46:17,708 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-11-16 19:47:05,212 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2022-11-16 19:47:05,213 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2022-11-16 19:47:05,213 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 41) no Hoare annotation was computed. [2022-11-16 19:47:05,213 INFO L899 garLoopResultBuilder]: For program point L41(line 41) no Hoare annotation was computed. [2022-11-16 19:47:05,213 INFO L899 garLoopResultBuilder]: For program point L40(lines 40 42) no Hoare annotation was computed. [2022-11-16 19:47:05,214 INFO L895 garLoopResultBuilder]: At program point L39(line 39) the Hoare annotation is: (let ((.cse0 (select |#memory_int| 1))) (and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= (select |#valid| 1) 1) (= 19 (select |#length| 2)) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select .cse0 0) 48) (= |ULTIMATE.start_main_~x~0#1| 10) (= (select .cse0 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) [2022-11-16 19:47:05,214 INFO L899 garLoopResultBuilder]: For program point L39-1(line 39) no Hoare annotation was computed. [2022-11-16 19:47:05,214 INFO L895 garLoopResultBuilder]: At program point L40-2(lines 40 42) the Hoare annotation is: (<= 10 |ULTIMATE.start_main_~x~0#1|) [2022-11-16 19:47:05,214 INFO L902 garLoopResultBuilder]: At program point fibo2ENTRY(lines 19 27) the Hoare annotation is: true [2022-11-16 19:47:05,215 INFO L895 garLoopResultBuilder]: At program point L25(line 25) the Hoare annotation is: (and (<= |fibo2_#in~n| fibo2_~n) (not (<= |fibo2_#in~n| 2)) (<= fibo2_~n |fibo2_#in~n|)) [2022-11-16 19:47:05,215 INFO L899 garLoopResultBuilder]: For program point L25-1(line 25) no Hoare annotation was computed. [2022-11-16 19:47:05,216 INFO L895 garLoopResultBuilder]: At program point L25-2(line 25) the Hoare annotation is: (let ((.cse7 (<= |fibo2_#in~n| 7)) (.cse12 (<= 5 |fibo2_#in~n|)) (.cse9 (<= fibo2_~n 5)) (.cse10 (<= |fibo2_#in~n| 4)) (.cse8 (<= 4 fibo2_~n)) (.cse13 (<= |fibo2_#in~n| 3))) (let ((.cse6 (and .cse13 (<= 3 |fibo2_#in~n|))) (.cse4 (and .cse10 .cse8)) (.cse1 (and (<= 6 |fibo2_#in~n|) (<= |fibo2_#in~n| 6))) (.cse5 (<= 8 |fibo2_#in~n|)) (.cse2 (and .cse13 (<= |fibo2_#t~ret6| 1) (<= 1 |fibo2_#t~ret6|))) (.cse0 (and .cse12 .cse9)) (.cse3 (and .cse7 .cse8 (<= 7 |fibo2_#in~n|)))) (and (or .cse0 .cse1 .cse2 .cse3 .cse4 .cse5) (or .cse6 (and .cse7 .cse8) (<= 9 |fibo2_#in~n|) (and (<= 13 |fibo2_#t~ret6|) (<= |fibo2_#t~ret6| 13))) (or .cse1 .cse6 .cse3 .cse4 .cse5 (and (<= 3 |fibo2_#t~ret6|) (<= |fibo2_#t~ret6| 3))) (or (and (<= 8 |fibo2_#t~ret6|) (<= |fibo2_#t~ret6| 8)) .cse1 .cse5 .cse9) (or (and (<= |fibo2_#t~ret6| 2) (<= 2 |fibo2_#t~ret6|)) .cse2 (not .cse10)) (let ((.cse11 (select |#memory_int| 1))) (or (not (= (select .cse11 0) 48)) (not (= |#NULL.offset| 0)) (not (= 2 (select |#length| 1))) (and (<= |fibo2_#t~ret6| 21) (<= 21 |fibo2_#t~ret6|)) (not (< 0 |#StackHeapBarrier|)) (not (= (select |#valid| 3) 1)) (not (= (select |#length| 3) 12)) (not (= (select |#valid| 0) 0)) (not (= (select .cse11 1) 0)) (not (= (select |#valid| 1) 1)) (not (= 19 (select |#length| 2))) (not (= 9 |fibo2_#in~n|)) (not (= |#NULL.base| 0)) (not (= (select |#valid| 2) 1)))) (<= |fibo2_#in~n| fibo2_~n) (or (and (<= |fibo2_#t~ret6| 5) (<= 5 |fibo2_#t~ret6|)) (not .cse7) .cse0 (not .cse12) .cse3) (<= fibo2_~n |fibo2_#in~n|)))) [2022-11-16 19:47:05,216 INFO L899 garLoopResultBuilder]: For program point L22(lines 22 26) no Hoare annotation was computed. [2022-11-16 19:47:05,216 INFO L899 garLoopResultBuilder]: For program point L25-3(line 25) no Hoare annotation was computed. [2022-11-16 19:47:05,216 INFO L899 garLoopResultBuilder]: For program point L20(lines 20 26) no Hoare annotation was computed. [2022-11-16 19:47:05,216 INFO L899 garLoopResultBuilder]: For program point fibo2FINAL(lines 19 27) no Hoare annotation was computed. [2022-11-16 19:47:05,216 INFO L899 garLoopResultBuilder]: For program point fibo2EXIT(lines 19 27) no Hoare annotation was computed. [2022-11-16 19:47:05,216 INFO L902 garLoopResultBuilder]: At program point fibo1ENTRY(lines 9 17) the Hoare annotation is: true [2022-11-16 19:47:05,217 INFO L895 garLoopResultBuilder]: At program point L15(line 15) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (< 1 fibo1_~n) (<= |fibo1_#in~n| fibo1_~n)) [2022-11-16 19:47:05,217 INFO L899 garLoopResultBuilder]: For program point L15-1(line 15) no Hoare annotation was computed. [2022-11-16 19:47:05,217 INFO L895 garLoopResultBuilder]: At program point L15-2(line 15) the Hoare annotation is: (let ((.cse3 (<= fibo1_~n |fibo1_#in~n|))) (let ((.cse0 (<= |fibo1_#in~n| 5)) (.cse2 (and .cse3 (< 1 fibo1_~n) (<= |fibo1_#in~n| 2)))) (and (or .cse0 (<= 7 |fibo1_#in~n|) (and (<= |fibo1_#t~ret4| 5) (<= 5 |fibo1_#t~ret4|))) (or (= |fibo1_#t~ret4| 1) (not (<= |fibo1_#in~n| 3))) (let ((.cse1 (select |#memory_int| 1))) (or (not (= (select .cse1 0) 48)) (not (= |#NULL.offset| 0)) (not (= 2 (select |#length| 1))) (not (< 0 |#StackHeapBarrier|)) (not (= (select |#valid| 3) 1)) (not (= (select |#length| 3) 12)) (not (= (select |#valid| 0) 0)) (not (= (select .cse1 1) 0)) (not (= (select |#valid| 1) 1)) (not (= 19 (select |#length| 2))) (not (= |#NULL.base| 0)) (not (= |fibo1_#in~n| 10)) (not (= (select |#valid| 2) 1)) (and (<= 34 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 34)))) (or (and (<= 13 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 13)) (<= |fibo1_#in~n| 7) (<= 9 |fibo1_#in~n|)) (or .cse2 (not .cse0) (and (<= 3 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 3))) (or .cse2 (and .cse3 (<= |fibo1_#in~n| fibo1_~n) (<= 5 fibo1_~n))) (or (and (<= 8 |fibo1_#t~ret4|) (<= |fibo1_#t~ret4| 8)) (<= 8 |fibo1_#in~n|) (<= |fibo1_#in~n| 6))))) [2022-11-16 19:47:05,218 INFO L899 garLoopResultBuilder]: For program point L12(lines 12 16) no Hoare annotation was computed. [2022-11-16 19:47:05,218 INFO L899 garLoopResultBuilder]: For program point L15-3(line 15) no Hoare annotation was computed. [2022-11-16 19:47:05,218 INFO L899 garLoopResultBuilder]: For program point fibo1FINAL(lines 9 17) no Hoare annotation was computed. [2022-11-16 19:47:05,218 INFO L899 garLoopResultBuilder]: For program point L10(lines 10 16) no Hoare annotation was computed. [2022-11-16 19:47:05,218 INFO L899 garLoopResultBuilder]: For program point fibo1EXIT(lines 9 17) no Hoare annotation was computed. [2022-11-16 19:47:05,222 INFO L444 BasicCegarLoop]: Path program histogram: [16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-16 19:47:05,224 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-16 19:47:05,238 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 16.11 07:47:05 BoogieIcfgContainer [2022-11-16 19:47:05,238 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-16 19:47:05,239 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-16 19:47:05,239 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-16 19:47:05,239 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-16 19:47:05,240 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.11 07:42:56" (3/4) ... [2022-11-16 19:47:05,243 INFO L137 WitnessPrinter]: Generating witness for correct program [2022-11-16 19:47:05,248 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo2 [2022-11-16 19:47:05,249 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo1 [2022-11-16 19:47:05,252 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2022-11-16 19:47:05,253 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2022-11-16 19:47:05,253 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2022-11-16 19:47:05,253 INFO L915 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2022-11-16 19:47:05,286 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/witness.graphml [2022-11-16 19:47:05,286 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-16 19:47:05,287 INFO L158 Benchmark]: Toolchain (without parser) took 249927.30ms. Allocated memory was 159.4MB in the beginning and 2.5GB in the end (delta: 2.4GB). Free memory was 126.7MB in the beginning and 2.3GB in the end (delta: -2.2GB). Peak memory consumption was 154.8MB. Max. memory is 16.1GB. [2022-11-16 19:47:05,287 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 92.3MB. Free memory was 45.7MB in the beginning and 45.6MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-16 19:47:05,288 INFO L158 Benchmark]: CACSL2BoogieTranslator took 249.47ms. Allocated memory is still 159.4MB. Free memory was 126.3MB in the beginning and 135.6MB in the end (delta: -9.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-11-16 19:47:05,291 INFO L158 Benchmark]: Boogie Procedure Inliner took 30.13ms. Allocated memory is still 159.4MB. Free memory was 135.3MB in the beginning and 134.0MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-16 19:47:05,293 INFO L158 Benchmark]: Boogie Preprocessor took 33.38ms. Allocated memory is still 159.4MB. Free memory was 134.0MB in the beginning and 133.2MB in the end (delta: 796.6kB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-16 19:47:05,293 INFO L158 Benchmark]: RCFGBuilder took 404.93ms. Allocated memory is still 159.4MB. Free memory was 133.2MB in the beginning and 122.2MB in the end (delta: 10.9MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2022-11-16 19:47:05,294 INFO L158 Benchmark]: TraceAbstraction took 249152.92ms. Allocated memory was 159.4MB in the beginning and 2.5GB in the end (delta: 2.4GB). Free memory was 121.4MB in the beginning and 2.4GB in the end (delta: -2.2GB). Peak memory consumption was 1.6GB. Max. memory is 16.1GB. [2022-11-16 19:47:05,295 INFO L158 Benchmark]: Witness Printer took 47.67ms. Allocated memory is still 2.5GB. Free memory was 2.4GB in the beginning and 2.3GB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2022-11-16 19:47:05,296 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 92.3MB. Free memory was 45.7MB in the beginning and 45.6MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 249.47ms. Allocated memory is still 159.4MB. Free memory was 126.3MB in the beginning and 135.6MB in the end (delta: -9.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 30.13ms. Allocated memory is still 159.4MB. Free memory was 135.3MB in the beginning and 134.0MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 33.38ms. Allocated memory is still 159.4MB. Free memory was 134.0MB in the beginning and 133.2MB in the end (delta: 796.6kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 404.93ms. Allocated memory is still 159.4MB. Free memory was 133.2MB in the beginning and 122.2MB in the end (delta: 10.9MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 249152.92ms. Allocated memory was 159.4MB in the beginning and 2.5GB in the end (delta: 2.4GB). Free memory was 121.4MB in the beginning and 2.4GB in the end (delta: -2.2GB). Peak memory consumption was 1.6GB. Max. memory is 16.1GB. * Witness Printer took 47.67ms. Allocated memory is still 2.5GB. Free memory was 2.4GB in the beginning and 2.3GB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 41]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 249.1s, OverallIterations: 24, TraceHistogramMax: 111, PathProgramHistogramMax: 16, EmptinessCheckTime: 0.2s, AutomataDifference: 17.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 47.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 2375 SdHoareTripleChecker+Valid, 10.4s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 2237 mSDsluCounter, 8872 SdHoareTripleChecker+Invalid, 8.7s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 8122 mSDsCounter, 2770 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 15646 IncrementalHoareTripleChecker+Invalid, 18416 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2770 mSolverCounterUnsat, 750 mSDtfsCounter, 15646 mSolverCounterSat, 0.2s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 31336 GetRequests, 30001 SyntacticMatches, 454 SemanticMatches, 881 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11640 ImplicationChecksByTransitivity, 16.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=266occurred in iteration=15, InterpolantAutomatonStates: 540, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 24 MinimizatonAttempts, 371 StatesRemovedByMinimization, 20 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 1208 PreInvPairs, 3054 NumberOfFragments, 541 HoareAnnotationTreeSize, 1208 FomulaSimplifications, 517707 FormulaSimplificationTreeSizeReduction, 42.4s HoareSimplificationTime, 8 FomulaSimplificationsInter, 310196 FormulaSimplificationTreeSizeReductionInter, 5.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 1.3s SsaConstructionTime, 6.0s SatisfiabilityAnalysisTime, 165.9s InterpolantComputationTime, 30343 NumberOfCodeBlocks, 27411 NumberOfCodeBlocksAsserted, 184 NumberOfCheckSat, 45437 ConstructedInterpolants, 0 QuantifiedInterpolants, 63033 SizeOfPredicates, 151 NumberOfNonLiveVariables, 27030 ConjunctsInSsa, 1054 ConjunctsInUnsatCore, 68 InterpolantComputations, 2 PerfectInterpolantSequences, 1464885/1593927 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 0.2s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 3, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 15, DAG_INTERPRETER_EARLY_EXITS: 6, TOOLS_POST_APPLICATIONS: 13, TOOLS_POST_TIME: 0.0s, TOOLS_POST_CALL_APPLICATIONS: 8, TOOLS_POST_CALL_TIME: 0.0s, TOOLS_POST_RETURN_APPLICATIONS: 6, TOOLS_POST_RETURN_TIME: 0.0s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 27, TOOLS_QUANTIFIERELIM_TIME: 0.1s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.0s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 35, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 1, DOMAIN_JOIN_TIME: 0.0s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 0, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 0, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 15, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 0, LOOP_SUMMARIZER_CACHE_MISSES: 0, LOOP_SUMMARIZER_OVERALL_TIME: 0.0s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 0, CALL_SUMMARIZER_APPLICATIONS: 6, CALL_SUMMARIZER_CACHE_MISSES: 2, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 142, DAG_COMPRESSION_RETAINED_NODES: 53, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 40]: Loop Invariant Derived loop invariant: 10 <= x RESULT: Ultimate proved your program to be correct! [2022-11-16 19:47:05,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ce9c6eac-370b-46e0-bad6-9425d362ab7a/bin/utaipan-Xvt2sAort0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE