./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 57096758 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs --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 23bbff91fb2bcbd238fb97db06c7d4983c05a850 ..................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs --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 23bbff91fb2bcbd238fb97db06c7d4983c05a850 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-5709675 [2021-10-16 02:04:10,144 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-16 02:04:10,146 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-16 02:04:10,192 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-16 02:04:10,193 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-16 02:04:10,194 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-16 02:04:10,197 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-16 02:04:10,200 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-16 02:04:10,203 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-16 02:04:10,205 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-16 02:04:10,207 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-16 02:04:10,209 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-16 02:04:10,209 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-16 02:04:10,211 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-16 02:04:10,214 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-16 02:04:10,216 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-16 02:04:10,218 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-16 02:04:10,220 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-16 02:04:10,223 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-16 02:04:10,226 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-16 02:04:10,229 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-16 02:04:10,241 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-16 02:04:10,243 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-16 02:04:10,245 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-16 02:04:10,252 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-16 02:04:10,256 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-16 02:04:10,257 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-16 02:04:10,259 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-16 02:04:10,260 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-16 02:04:10,262 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-16 02:04:10,264 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-16 02:04:10,265 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-16 02:04:10,268 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-16 02:04:10,270 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-16 02:04:10,272 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-16 02:04:10,273 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-16 02:04:10,274 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-16 02:04:10,274 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-16 02:04:10,275 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-16 02:04:10,276 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-16 02:04:10,277 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-16 02:04:10,279 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-16 02:04:10,340 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-16 02:04:10,344 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-16 02:04:10,345 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-16 02:04:10,346 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-16 02:04:10,346 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-16 02:04:10,347 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-16 02:04:10,347 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-16 02:04:10,347 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-16 02:04:10,347 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-16 02:04:10,348 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-16 02:04:10,353 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-16 02:04:10,353 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-16 02:04:10,354 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-16 02:04:10,354 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-16 02:04:10,354 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-16 02:04:10,355 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-16 02:04:10,356 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-16 02:04:10,356 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-16 02:04:10,356 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-16 02:04:10,357 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-16 02:04:10,357 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-16 02:04:10,357 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-16 02:04:10,357 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-16 02:04:10,358 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-16 02:04:10,358 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-16 02:04:10,358 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-16 02:04:10,359 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-16 02:04:10,359 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-16 02:04:10,359 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-16 02:04:10,360 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-16 02:04:10,360 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 02:04:10,360 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-16 02:04:10,361 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-16 02:04:10,361 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-16 02:04:10,361 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-16 02:04:10,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-16 02:04:10,362 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-16 02:04:10,362 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-16 02:04:10,362 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-16 02:04:10,363 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 23bbff91fb2bcbd238fb97db06c7d4983c05a850 [2021-10-16 02:04:10,697 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-16 02:04:10,724 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-16 02:04:10,727 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-16 02:04:10,729 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-16 02:04:10,730 INFO L275 PluginConnector]: CDTParser initialized [2021-10-16 02:04:10,731 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2021-10-16 02:04:10,823 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data/3e6d5b4aa/97a1967e3754441aadc108b39f7e37ae/FLAGb696a096d [2021-10-16 02:04:11,407 INFO L306 CDTParser]: Found 1 translation units. [2021-10-16 02:04:11,408 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2021-10-16 02:04:11,417 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data/3e6d5b4aa/97a1967e3754441aadc108b39f7e37ae/FLAGb696a096d [2021-10-16 02:04:11,729 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data/3e6d5b4aa/97a1967e3754441aadc108b39f7e37ae [2021-10-16 02:04:11,732 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-16 02:04:11,734 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-16 02:04:11,736 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-16 02:04:11,736 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-16 02:04:11,740 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-16 02:04:11,741 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 02:04:11" (1/1) ... [2021-10-16 02:04:11,743 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43093d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:11, skipping insertion in model container [2021-10-16 02:04:11,743 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 02:04:11" (1/1) ... [2021-10-16 02:04:11,752 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-16 02:04:11,768 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-16 02:04:11,955 WARN L228 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_813fec0c-9b42-4c53-9372-4bde5f0f1875/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2021-10-16 02:04:11,959 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 02:04:11,979 INFO L203 MainTranslator]: Completed pre-run [2021-10-16 02:04:12,035 WARN L228 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_813fec0c-9b42-4c53-9372-4bde5f0f1875/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2021-10-16 02:04:12,036 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 02:04:12,053 INFO L208 MainTranslator]: Completed translation [2021-10-16 02:04:12,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12 WrapperNode [2021-10-16 02:04:12,053 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-16 02:04:12,055 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-16 02:04:12,055 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-16 02:04:12,055 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-16 02:04:12,065 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,073 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,093 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-16 02:04:12,094 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-16 02:04:12,094 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-16 02:04:12,094 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-16 02:04:12,104 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,104 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,106 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,106 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,111 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,113 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,114 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,116 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-16 02:04:12,118 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-16 02:04:12,118 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-16 02:04:12,118 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-16 02:04:12,119 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (1/1) ... [2021-10-16 02:04:12,128 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 02:04:12,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:12,167 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-16 02:04:12,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-16 02:04:12,227 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-16 02:04:12,227 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-16 02:04:12,229 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-16 02:04:12,230 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-16 02:04:12,230 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-16 02:04:12,230 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-16 02:04:12,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-16 02:04:12,231 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-16 02:04:12,523 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-16 02:04:12,523 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-16 02:04:12,526 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:04:12 BoogieIcfgContainer [2021-10-16 02:04:12,526 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-16 02:04:12,529 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-16 02:04:12,529 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-16 02:04:12,546 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-16 02:04:12,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.10 02:04:11" (1/3) ... [2021-10-16 02:04:12,547 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@432e8fde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 02:04:12, skipping insertion in model container [2021-10-16 02:04:12,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:12" (2/3) ... [2021-10-16 02:04:12,548 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@432e8fde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 02:04:12, skipping insertion in model container [2021-10-16 02:04:12,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:04:12" (3/3) ... [2021-10-16 02:04:12,549 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2021-10-16 02:04:12,556 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-16 02:04:12,556 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-16 02:04:12,614 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-16 02:04:12,622 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-10-16 02:04:12,623 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-16 02:04:12,643 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-16 02:04:12,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-16 02:04:12,649 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:12,650 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:12,651 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:12,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:12,657 INFO L82 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2021-10-16 02:04:12,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 02:04:12,669 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423666204] [2021-10-16 02:04:12,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:12,671 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 02:04:12,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:12,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:04:12,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 02:04:12,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423666204] [2021-10-16 02:04:12,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [423666204] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 02:04:12,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 02:04:12,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-16 02:04:12,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711258313] [2021-10-16 02:04:13,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-16 02:04:13,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 02:04:13,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-16 02:04:13,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-16 02:04:13,022 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-16 02:04:13,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:13,100 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-10-16 02:04:13,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-16 02:04:13,102 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-10-16 02:04:13,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:13,112 INFO L225 Difference]: With dead ends: 36 [2021-10-16 02:04:13,112 INFO L226 Difference]: Without dead ends: 26 [2021-10-16 02:04:13,116 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 45.1ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-16 02:04:13,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-10-16 02:04:13,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-10-16 02:04:13,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-16 02:04:13,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-16 02:04:13,167 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2021-10-16 02:04:13,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:13,167 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-16 02:04:13,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-16 02:04:13,168 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-16 02:04:13,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-16 02:04:13,170 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:13,170 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:13,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-16 02:04:13,171 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:13,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:13,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2021-10-16 02:04:13,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 02:04:13,173 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409478732] [2021-10-16 02:04:13,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:13,173 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 02:04:13,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:13,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:04:13,253 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 02:04:13,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409478732] [2021-10-16 02:04:13,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409478732] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 02:04:13,254 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 02:04:13,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-16 02:04:13,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678899048] [2021-10-16 02:04:13,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-16 02:04:13,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 02:04:13,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-16 02:04:13,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-16 02:04:13,258 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-16 02:04:13,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:13,302 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-10-16 02:04:13,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-16 02:04:13,303 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-16 02:04:13,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:13,307 INFO L225 Difference]: With dead ends: 32 [2021-10-16 02:04:13,308 INFO L226 Difference]: Without dead ends: 28 [2021-10-16 02:04:13,309 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.3ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-16 02:04:13,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-10-16 02:04:13,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-10-16 02:04:13,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-16 02:04:13,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-16 02:04:13,327 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2021-10-16 02:04:13,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:13,328 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-16 02:04:13,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-16 02:04:13,329 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-16 02:04:13,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-16 02:04:13,332 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:13,333 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:13,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-16 02:04:13,339 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:13,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:13,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2021-10-16 02:04:13,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 02:04:13,343 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879518171] [2021-10-16 02:04:13,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:13,343 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 02:04:13,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:13,503 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:13,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 02:04:13,510 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879518171] [2021-10-16 02:04:13,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879518171] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-16 02:04:13,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108600508] [2021-10-16 02:04:13,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:13,513 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:13,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:13,515 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:13,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-16 02:04:13,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:13,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:13,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:13,856 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:13,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:14,250 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:14,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108600508] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:14,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [369636188] [2021-10-16 02:04:14,293 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-16 02:04:14,293 INFO L166 IcfgInterpreter]: Building call graph [2021-10-16 02:04:14,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-16 02:04:14,316 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-16 02:04:14,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-16 02:04:14,358 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:04:14,365 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-16 02:04:14,367 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:04:14,367 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-10-16 02:04:14,369 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-16 02:04:14,369 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:04:14,370 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-10-16 02:04:14,373 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-10-16 02:04:14,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-16 02:04:14,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-16 02:04:14,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-16 02:04:14,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-10-16 02:04:14,437 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:04:14,438 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-16 02:04:14,439 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:04:14,440 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-16 02:04:14,441 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-16 02:04:14,443 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-16 02:04:14,504 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:04:14,506 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 02:04:14,514 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-10-16 02:04:14,514 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-16 02:04:14,515 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:119, output treesize:122 [2021-10-16 02:04:14,567 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-10-16 02:04:14,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-10-16 02:04:14,734 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#valid_10| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-16 02:04:14,737 INFO L168 Benchmark]: Toolchain (without parser) took 3003.26 ms. Allocated memory is still 117.4 MB. Free memory was 82.2 MB in the beginning and 70.1 MB in the end (delta: 12.0 MB). Peak memory consumption was 10.1 MB. Max. memory is 16.1 GB. [2021-10-16 02:04:14,738 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 79.7 MB. Free memory was 55.4 MB in the beginning and 55.4 MB in the end (delta: 29.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:04:14,739 INFO L168 Benchmark]: CACSL2BoogieTranslator took 318.08 ms. Allocated memory is still 117.4 MB. Free memory was 82.0 MB in the beginning and 94.3 MB in the end (delta: -12.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-16 02:04:14,740 INFO L168 Benchmark]: Boogie Procedure Inliner took 38.07 ms. Allocated memory is still 117.4 MB. Free memory was 94.3 MB in the beginning and 92.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-16 02:04:14,740 INFO L168 Benchmark]: Boogie Preprocessor took 23.05 ms. Allocated memory is still 117.4 MB. Free memory was 92.8 MB in the beginning and 91.6 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:04:14,741 INFO L168 Benchmark]: RCFGBuilder took 409.03 ms. Allocated memory is still 117.4 MB. Free memory was 91.6 MB in the beginning and 81.1 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-16 02:04:14,741 INFO L168 Benchmark]: TraceAbstraction took 2207.70 ms. Allocated memory is still 117.4 MB. Free memory was 80.8 MB in the beginning and 70.1 MB in the end (delta: 10.6 MB). Peak memory consumption was 11.0 MB. Max. memory is 16.1 GB. [2021-10-16 02:04:14,745 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 79.7 MB. Free memory was 55.4 MB in the beginning and 55.4 MB in the end (delta: 29.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 318.08 ms. Allocated memory is still 117.4 MB. Free memory was 82.0 MB in the beginning and 94.3 MB in the end (delta: -12.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 38.07 ms. Allocated memory is still 117.4 MB. Free memory was 94.3 MB in the beginning and 92.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 23.05 ms. Allocated memory is still 117.4 MB. Free memory was 92.8 MB in the beginning and 91.6 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 409.03 ms. Allocated memory is still 117.4 MB. Free memory was 91.6 MB in the beginning and 81.1 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2207.70 ms. Allocated memory is still 117.4 MB. Free memory was 80.8 MB in the beginning and 70.1 MB in the end (delta: 10.6 MB). Peak memory consumption was 11.0 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#valid_10| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#valid_10|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-16 02:04:14,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-5709675 [2021-10-16 02:04:17,736 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-16 02:04:17,740 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-16 02:04:17,790 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-16 02:04:17,791 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-16 02:04:17,792 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-16 02:04:17,794 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-16 02:04:17,797 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-16 02:04:17,800 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-16 02:04:17,801 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-16 02:04:17,803 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-16 02:04:17,804 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-16 02:04:17,805 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-16 02:04:17,806 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-16 02:04:17,808 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-16 02:04:17,810 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-16 02:04:17,811 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-16 02:04:17,813 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-16 02:04:17,815 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-16 02:04:17,818 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-16 02:04:17,820 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-16 02:04:17,825 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-16 02:04:17,827 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-16 02:04:17,828 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-16 02:04:17,833 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-16 02:04:17,833 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-16 02:04:17,834 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-16 02:04:17,835 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-16 02:04:17,836 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-16 02:04:17,837 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-16 02:04:17,838 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-16 02:04:17,846 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-16 02:04:17,848 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-16 02:04:17,849 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-16 02:04:17,854 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-16 02:04:17,854 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-16 02:04:17,855 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-16 02:04:17,856 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-16 02:04:17,856 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-16 02:04:17,858 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-16 02:04:17,859 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-16 02:04:17,865 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-10-16 02:04:17,919 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-16 02:04:17,919 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-16 02:04:17,921 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-16 02:04:17,922 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-16 02:04:17,922 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-16 02:04:17,922 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-16 02:04:17,922 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-16 02:04:17,922 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-16 02:04:17,923 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-16 02:04:17,924 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-16 02:04:17,925 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-16 02:04:17,926 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-16 02:04:17,926 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-16 02:04:17,926 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-16 02:04:17,926 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-16 02:04:17,927 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-16 02:04:17,927 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-16 02:04:17,927 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-16 02:04:17,927 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-16 02:04:17,928 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-16 02:04:17,928 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-16 02:04:17,928 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-16 02:04:17,928 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-16 02:04:17,928 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-16 02:04:17,929 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-16 02:04:17,929 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-16 02:04:17,929 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 02:04:17,929 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-16 02:04:17,930 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-16 02:04:17,930 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-16 02:04:17,930 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-16 02:04:17,930 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:17,930 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-16 02:04:17,931 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-16 02:04:17,931 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-16 02:04:17,931 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 23bbff91fb2bcbd238fb97db06c7d4983c05a850 [2021-10-16 02:04:18,352 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-16 02:04:18,372 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-16 02:04:18,375 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-16 02:04:18,376 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-16 02:04:18,377 INFO L275 PluginConnector]: CDTParser initialized [2021-10-16 02:04:18,378 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2021-10-16 02:04:18,446 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data/2b63a5590/d57f876c25874f31bf4165a5c68c511d/FLAGa6f480902 [2021-10-16 02:04:19,026 INFO L306 CDTParser]: Found 1 translation units. [2021-10-16 02:04:19,027 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2021-10-16 02:04:19,035 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data/2b63a5590/d57f876c25874f31bf4165a5c68c511d/FLAGa6f480902 [2021-10-16 02:04:19,367 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/data/2b63a5590/d57f876c25874f31bf4165a5c68c511d [2021-10-16 02:04:19,370 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-16 02:04:19,372 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-16 02:04:19,373 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-16 02:04:19,373 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-16 02:04:19,390 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-16 02:04:19,391 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,392 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3379b809 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19, skipping insertion in model container [2021-10-16 02:04:19,393 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,401 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-16 02:04:19,416 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-16 02:04:19,571 WARN L228 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_813fec0c-9b42-4c53-9372-4bde5f0f1875/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2021-10-16 02:04:19,574 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 02:04:19,592 INFO L203 MainTranslator]: Completed pre-run [2021-10-16 02:04:19,611 WARN L228 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_813fec0c-9b42-4c53-9372-4bde5f0f1875/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2021-10-16 02:04:19,612 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 02:04:19,627 INFO L208 MainTranslator]: Completed translation [2021-10-16 02:04:19,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19 WrapperNode [2021-10-16 02:04:19,628 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-16 02:04:19,629 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-16 02:04:19,630 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-16 02:04:19,630 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-16 02:04:19,637 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,646 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,665 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-16 02:04:19,666 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-16 02:04:19,666 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-16 02:04:19,666 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-16 02:04:19,685 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,688 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,694 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,697 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,698 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,701 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-16 02:04:19,702 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-16 02:04:19,703 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-16 02:04:19,703 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-16 02:04:19,704 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (1/1) ... [2021-10-16 02:04:19,713 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 02:04:19,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:19,743 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-16 02:04:19,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-16 02:04:19,802 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-16 02:04:19,802 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-16 02:04:19,802 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-16 02:04:19,802 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-16 02:04:19,802 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-16 02:04:19,803 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-16 02:04:19,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-16 02:04:19,803 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-16 02:04:20,051 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-16 02:04:20,051 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-16 02:04:20,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:04:20 BoogieIcfgContainer [2021-10-16 02:04:20,054 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-16 02:04:20,056 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-16 02:04:20,056 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-16 02:04:20,059 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-16 02:04:20,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.10 02:04:19" (1/3) ... [2021-10-16 02:04:20,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54a68214 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 02:04:20, skipping insertion in model container [2021-10-16 02:04:20,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 02:04:19" (2/3) ... [2021-10-16 02:04:20,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54a68214 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 02:04:20, skipping insertion in model container [2021-10-16 02:04:20,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:04:20" (3/3) ... [2021-10-16 02:04:20,062 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2021-10-16 02:04:20,068 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-16 02:04:20,069 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-16 02:04:20,126 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-16 02:04:20,135 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-10-16 02:04:20,135 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-16 02:04:20,155 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-16 02:04:20,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-16 02:04:20,162 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:20,163 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:20,164 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:20,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:20,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1014607960, now seen corresponding path program 1 times [2021-10-16 02:04:20,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:20,188 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1260950199] [2021-10-16 02:04:20,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:20,189 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:20,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:20,193 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:20,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-16 02:04:20,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:20,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:04:20,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:20,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:04:20,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:20,834 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:04:20,836 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:20,837 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1260950199] [2021-10-16 02:04:20,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1260950199] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:04:20,838 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 02:04:20,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-16 02:04:20,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211956120] [2021-10-16 02:04:20,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-16 02:04:20,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:20,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-16 02:04:20,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-16 02:04:20,884 INFO L87 Difference]: Start difference. First operand has 27 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 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 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-16 02:04:21,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:21,049 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2021-10-16 02:04:21,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-16 02:04:21,052 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 10 [2021-10-16 02:04:21,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:21,063 INFO L225 Difference]: With dead ends: 37 [2021-10-16 02:04:21,064 INFO L226 Difference]: Without dead ends: 25 [2021-10-16 02:04:21,067 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 81.5ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-16 02:04:21,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-10-16 02:04:21,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-10-16 02:04:21,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-16 02:04:21,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-10-16 02:04:21,125 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 10 [2021-10-16 02:04:21,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:21,126 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-10-16 02:04:21,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-16 02:04:21,127 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-10-16 02:04:21,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-16 02:04:21,129 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:21,129 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:21,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:21,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:04:21,343 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:21,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:21,344 INFO L82 PathProgramCache]: Analyzing trace with hash 2131805067, now seen corresponding path program 1 times [2021-10-16 02:04:21,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:21,345 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1588625188] [2021-10-16 02:04:21,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:21,346 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:21,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:21,347 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:21,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-16 02:04:21,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:21,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 02:04:21,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:21,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:04:21,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:21,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 02:04:21,646 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:21,646 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1588625188] [2021-10-16 02:04:21,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1588625188] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:04:21,648 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 02:04:21,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-16 02:04:21,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720626623] [2021-10-16 02:04:21,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-16 02:04:21,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:21,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-16 02:04:21,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-16 02:04:21,655 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-16 02:04:21,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:21,787 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2021-10-16 02:04:21,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-16 02:04:21,789 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 11 [2021-10-16 02:04:21,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:21,791 INFO L225 Difference]: With dead ends: 31 [2021-10-16 02:04:21,791 INFO L226 Difference]: Without dead ends: 27 [2021-10-16 02:04:21,793 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 49.7ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-16 02:04:21,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-10-16 02:04:21,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-10-16 02:04:21,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-16 02:04:21,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-10-16 02:04:21,814 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 11 [2021-10-16 02:04:21,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:21,815 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-10-16 02:04:21,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-16 02:04:21,815 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-10-16 02:04:21,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-16 02:04:21,817 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:21,817 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:21,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:22,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:04:22,030 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:22,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:22,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1494555912, now seen corresponding path program 1 times [2021-10-16 02:04:22,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:22,032 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1623665362] [2021-10-16 02:04:22,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:22,033 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:22,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:22,034 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:22,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-16 02:04:22,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:22,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:22,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:22,286 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:22,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:22,709 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:22,710 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:22,711 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1623665362] [2021-10-16 02:04:22,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1623665362] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:22,712 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [399940579] [2021-10-16 02:04:22,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:22,713 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:22,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:22,717 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:22,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-10-16 02:04:22,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:22,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:04:22,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:23,115 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:04:23,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:23,528 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-16 02:04:23,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [399940579] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:04:23,528 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-10-16 02:04:23,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 9] imperfect sequences [7, 7] total 22 [2021-10-16 02:04:23,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572097030] [2021-10-16 02:04:23,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-16 02:04:23,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:23,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-16 02:04:23,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=408, Unknown=0, NotChecked=0, Total=462 [2021-10-16 02:04:23,532 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-16 02:04:23,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:23,716 INFO L93 Difference]: Finished difference Result 48 states and 67 transitions. [2021-10-16 02:04:23,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-10-16 02:04:23,717 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 22 [2021-10-16 02:04:23,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:23,720 INFO L225 Difference]: With dead ends: 48 [2021-10-16 02:04:23,720 INFO L226 Difference]: Without dead ends: 42 [2021-10-16 02:04:23,721 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 580.7ms TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-10-16 02:04:23,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-10-16 02:04:23,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 32. [2021-10-16 02:04:23,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-10-16 02:04:23,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 47 transitions. [2021-10-16 02:04:23,746 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 47 transitions. Word has length 22 [2021-10-16 02:04:23,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:23,748 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 47 transitions. [2021-10-16 02:04:23,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-16 02:04:23,750 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 47 transitions. [2021-10-16 02:04:23,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-16 02:04:23,756 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:23,756 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:23,779 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-10-16 02:04:23,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:24,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:24,172 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:24,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:24,173 INFO L82 PathProgramCache]: Analyzing trace with hash -553851548, now seen corresponding path program 1 times [2021-10-16 02:04:24,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:24,174 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1585692718] [2021-10-16 02:04:24,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:24,174 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:24,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:24,176 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:24,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-16 02:04:24,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:24,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:24,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:24,428 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:24,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:24,754 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:24,754 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:24,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1585692718] [2021-10-16 02:04:24,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1585692718] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:24,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [173700336] [2021-10-16 02:04:24,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:24,756 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:24,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:24,758 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:24,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-10-16 02:04:24,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:24,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:24,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:25,064 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:25,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:25,312 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:25,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [173700336] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:25,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973215881] [2021-10-16 02:04:25,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:25,313 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:25,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:25,315 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:25,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-16 02:04:25,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:25,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:25,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:25,600 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-16 02:04:25,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:25,914 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 02:04:25,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973215881] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:04:25,914 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-16 02:04:25,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 7] imperfect sequences [7, 7, 7, 7] total 14 [2021-10-16 02:04:25,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824022847] [2021-10-16 02:04:25,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-16 02:04:25,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:25,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-16 02:04:25,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-10-16 02:04:25,917 INFO L87 Difference]: Start difference. First operand 32 states and 47 transitions. Second operand has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-16 02:04:26,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:26,128 INFO L93 Difference]: Finished difference Result 78 states and 136 transitions. [2021-10-16 02:04:26,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-16 02:04:26,141 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 24 [2021-10-16 02:04:26,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:26,144 INFO L225 Difference]: With dead ends: 78 [2021-10-16 02:04:26,144 INFO L226 Difference]: Without dead ends: 49 [2021-10-16 02:04:26,146 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 174.8ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-10-16 02:04:26,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-16 02:04:26,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 40. [2021-10-16 02:04:26,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.25) internal successors, (30), 26 states have internal predecessors, (30), 9 states have call successors, (9), 3 states have call predecessors, (9), 6 states have return successors, (19), 10 states have call predecessors, (19), 9 states have call successors, (19) [2021-10-16 02:04:26,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 58 transitions. [2021-10-16 02:04:26,165 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 58 transitions. Word has length 24 [2021-10-16 02:04:26,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:26,165 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 58 transitions. [2021-10-16 02:04:26,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-16 02:04:26,166 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 58 transitions. [2021-10-16 02:04:26,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-10-16 02:04:26,169 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:26,169 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:26,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:26,376 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (7)] Ended with exit code 0 [2021-10-16 02:04:26,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:26,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:26,775 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:26,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:26,776 INFO L82 PathProgramCache]: Analyzing trace with hash -650293480, now seen corresponding path program 1 times [2021-10-16 02:04:26,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:26,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [341289189] [2021-10-16 02:04:26,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:26,777 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:26,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:26,779 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:26,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-16 02:04:26,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:26,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:26,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:27,136 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:27,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:27,560 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:27,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:27,561 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [341289189] [2021-10-16 02:04:27,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [341289189] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:27,562 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1401529651] [2021-10-16 02:04:27,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:27,562 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:27,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:27,575 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:27,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-16 02:04:27,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:27,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-16 02:04:27,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:28,104 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-16 02:04:28,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:28,593 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-16 02:04:28,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1401529651] provided 1 perfect and 1 imperfect interpolant sequences [2021-10-16 02:04:28,594 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2021-10-16 02:04:28,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [7, 7, 12] total 25 [2021-10-16 02:04:28,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924072321] [2021-10-16 02:04:28,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-16 02:04:28,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:28,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-16 02:04:28,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-10-16 02:04:28,605 INFO L87 Difference]: Start difference. First operand 40 states and 58 transitions. Second operand has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-16 02:04:28,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:28,675 INFO L93 Difference]: Finished difference Result 62 states and 100 transitions. [2021-10-16 02:04:28,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-16 02:04:28,676 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2021-10-16 02:04:28,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:28,679 INFO L225 Difference]: With dead ends: 62 [2021-10-16 02:04:28,679 INFO L226 Difference]: Without dead ends: 58 [2021-10-16 02:04:28,681 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 453.6ms TimeCoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-10-16 02:04:28,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-10-16 02:04:28,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2021-10-16 02:04:28,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 11 states have call successors, (11), 3 states have call predecessors, (11), 8 states have return successors, (33), 14 states have call predecessors, (33), 11 states have call successors, (33) [2021-10-16 02:04:28,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 78 transitions. [2021-10-16 02:04:28,699 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 78 transitions. Word has length 34 [2021-10-16 02:04:28,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:28,699 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 78 transitions. [2021-10-16 02:04:28,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-16 02:04:28,700 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 78 transitions. [2021-10-16 02:04:28,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-16 02:04:28,703 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:28,703 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:28,708 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (10)] Ended with exit code 0 [2021-10-16 02:04:28,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:29,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:04:29,106 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:29,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:29,107 INFO L82 PathProgramCache]: Analyzing trace with hash 159296083, now seen corresponding path program 1 times [2021-10-16 02:04:29,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:29,107 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [191871717] [2021-10-16 02:04:29,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:29,108 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:29,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:29,109 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:29,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-10-16 02:04:29,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:29,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:29,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:29,450 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:29,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:29,835 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:29,836 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:29,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [191871717] [2021-10-16 02:04:29,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [191871717] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:29,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1353775832] [2021-10-16 02:04:29,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:29,837 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:29,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:29,843 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:29,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-10-16 02:04:30,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:30,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-16 02:04:30,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:30,464 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-10-16 02:04:30,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:31,009 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-16 02:04:31,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1353775832] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:31,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515752859] [2021-10-16 02:04:31,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:31,010 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:31,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:31,012 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:31,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-16 02:04:31,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:31,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-16 02:04:31,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:31,435 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-10-16 02:04:31,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:31,773 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-16 02:04:31,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515752859] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:31,774 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:04:31,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 12, 13, 12, 13] total 27 [2021-10-16 02:04:31,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600651978] [2021-10-16 02:04:31,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-16 02:04:31,776 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:31,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-16 02:04:31,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=634, Unknown=0, NotChecked=0, Total=702 [2021-10-16 02:04:31,778 INFO L87 Difference]: Start difference. First operand 48 states and 78 transitions. Second operand has 27 states, 22 states have (on average 2.227272727272727) internal successors, (49), 18 states have internal predecessors, (49), 9 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (16), 12 states have call predecessors, (16), 9 states have call successors, (16) [2021-10-16 02:04:33,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:33,059 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2021-10-16 02:04:33,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-10-16 02:04:33,061 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 2.227272727272727) internal successors, (49), 18 states have internal predecessors, (49), 9 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (16), 12 states have call predecessors, (16), 9 states have call successors, (16) Word has length 35 [2021-10-16 02:04:33,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:33,064 INFO L225 Difference]: With dead ends: 86 [2021-10-16 02:04:33,064 INFO L226 Difference]: Without dead ends: 80 [2021-10-16 02:04:33,067 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 1166.3ms TimeCoverageRelationStatistics Valid=186, Invalid=1620, Unknown=0, NotChecked=0, Total=1806 [2021-10-16 02:04:33,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-16 02:04:33,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 62. [2021-10-16 02:04:33,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 38 states have internal predecessors, (41), 14 states have call successors, (14), 3 states have call predecessors, (14), 12 states have return successors, (63), 20 states have call predecessors, (63), 14 states have call successors, (63) [2021-10-16 02:04:33,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 118 transitions. [2021-10-16 02:04:33,090 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 118 transitions. Word has length 35 [2021-10-16 02:04:33,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:33,091 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 118 transitions. [2021-10-16 02:04:33,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 2.227272727272727) internal successors, (49), 18 states have internal predecessors, (49), 9 states have call successors, (12), 1 states have call predecessors, (12), 9 states have return successors, (16), 12 states have call predecessors, (16), 9 states have call successors, (16) [2021-10-16 02:04:33,091 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 118 transitions. [2021-10-16 02:04:33,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-16 02:04:33,095 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:33,096 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:33,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:33,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:33,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:33,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:04:33,707 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:33,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:33,708 INFO L82 PathProgramCache]: Analyzing trace with hash 186789494, now seen corresponding path program 1 times [2021-10-16 02:04:33,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:33,708 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [870521123] [2021-10-16 02:04:33,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:33,709 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:33,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:33,710 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:33,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-10-16 02:04:33,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:33,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:33,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:34,075 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:34,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:34,372 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:34,373 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:34,373 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [870521123] [2021-10-16 02:04:34,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [870521123] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:34,373 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1943680021] [2021-10-16 02:04:34,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:34,373 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:34,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:34,375 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:34,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-10-16 02:04:34,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:34,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:34,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:34,876 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:34,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:35,130 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:35,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1943680021] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:35,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621463769] [2021-10-16 02:04:35,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:35,131 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:35,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:35,139 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:35,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-16 02:04:35,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:35,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:35,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:35,633 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:35,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:35,935 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:35,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621463769] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:35,935 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:04:35,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 10 [2021-10-16 02:04:35,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515641922] [2021-10-16 02:04:35,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-16 02:04:35,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:35,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-16 02:04:35,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-10-16 02:04:35,942 INFO L87 Difference]: Start difference. First operand 62 states and 118 transitions. Second operand has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-16 02:04:36,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:36,116 INFO L93 Difference]: Finished difference Result 72 states and 140 transitions. [2021-10-16 02:04:36,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-16 02:04:36,117 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) Word has length 35 [2021-10-16 02:04:36,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:36,119 INFO L225 Difference]: With dead ends: 72 [2021-10-16 02:04:36,119 INFO L226 Difference]: Without dead ends: 68 [2021-10-16 02:04:36,120 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 82.1ms TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-10-16 02:04:36,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-10-16 02:04:36,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 58. [2021-10-16 02:04:36,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 36 states have internal predecessors, (39), 13 states have call successors, (13), 3 states have call predecessors, (13), 11 states have return successors, (57), 18 states have call predecessors, (57), 13 states have call successors, (57) [2021-10-16 02:04:36,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 109 transitions. [2021-10-16 02:04:36,146 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 109 transitions. Word has length 35 [2021-10-16 02:04:36,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:36,147 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 109 transitions. [2021-10-16 02:04:36,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-16 02:04:36,147 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 109 transitions. [2021-10-16 02:04:36,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-16 02:04:36,150 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:36,150 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:36,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:36,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:36,564 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-10-16 02:04:36,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:04:36,755 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:36,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:36,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1761102882, now seen corresponding path program 2 times [2021-10-16 02:04:36,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:36,756 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1084528102] [2021-10-16 02:04:36,756 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:04:36,757 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:36,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:36,757 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:36,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-10-16 02:04:37,036 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:04:37,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:37,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:04:37,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:37,228 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-16 02:04:37,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:37,817 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:04:37,817 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:37,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1084528102] [2021-10-16 02:04:37,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1084528102] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:37,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1220873255] [2021-10-16 02:04:37,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:04:37,818 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:37,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:37,822 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:37,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-10-16 02:04:38,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:04:38,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:38,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:38,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:38,409 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:38,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:38,737 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:38,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1220873255] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:38,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358826243] [2021-10-16 02:04:38,738 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:04:38,738 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:38,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:38,739 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:38,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-10-16 02:04:39,152 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:04:39,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:39,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:39,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:39,264 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:39,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:39,541 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-16 02:04:39,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358826243] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:39,541 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:04:39,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7, 7, 7, 7] total 17 [2021-10-16 02:04:39,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148834162] [2021-10-16 02:04:39,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-16 02:04:39,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:39,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-16 02:04:39,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-10-16 02:04:39,549 INFO L87 Difference]: Start difference. First operand 58 states and 109 transitions. Second operand has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) [2021-10-16 02:04:40,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:40,009 INFO L93 Difference]: Finished difference Result 139 states and 322 transitions. [2021-10-16 02:04:40,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-16 02:04:40,010 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) Word has length 35 [2021-10-16 02:04:40,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:40,016 INFO L225 Difference]: With dead ends: 139 [2021-10-16 02:04:40,019 INFO L226 Difference]: Without dead ends: 84 [2021-10-16 02:04:40,023 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 401.5ms TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-10-16 02:04:40,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-10-16 02:04:40,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 62. [2021-10-16 02:04:40,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 38 states have internal predecessors, (41), 14 states have call successors, (14), 3 states have call predecessors, (14), 12 states have return successors, (64), 20 states have call predecessors, (64), 14 states have call successors, (64) [2021-10-16 02:04:40,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 119 transitions. [2021-10-16 02:04:40,077 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 119 transitions. Word has length 35 [2021-10-16 02:04:40,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:40,077 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 119 transitions. [2021-10-16 02:04:40,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) [2021-10-16 02:04:40,078 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 119 transitions. [2021-10-16 02:04:40,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-16 02:04:40,083 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:40,084 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:40,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:40,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:40,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:40,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:04:40,699 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:40,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:40,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1656487097, now seen corresponding path program 2 times [2021-10-16 02:04:40,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:40,700 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [183421349] [2021-10-16 02:04:40,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:04:40,700 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:40,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:40,701 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:40,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-10-16 02:04:41,076 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:04:41,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:41,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:04:41,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:41,255 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-16 02:04:41,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:41,680 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:04:41,681 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:41,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [183421349] [2021-10-16 02:04:41,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [183421349] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:41,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [491882565] [2021-10-16 02:04:41,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:04:41,681 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:41,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:41,682 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:41,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-10-16 02:04:42,206 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:04:42,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:42,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:04:42,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:42,334 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-16 02:04:42,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:42,712 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:04:42,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [491882565] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:42,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350419826] [2021-10-16 02:04:42,713 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:04:42,713 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:42,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:42,714 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:42,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-10-16 02:04:43,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:04:43,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:43,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:04:43,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:43,335 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-16 02:04:43,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:43,705 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-16 02:04:43,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350419826] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:43,706 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:04:43,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 8, 9] total 12 [2021-10-16 02:04:43,708 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473416122] [2021-10-16 02:04:43,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-16 02:04:43,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:43,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-16 02:04:43,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-10-16 02:04:43,712 INFO L87 Difference]: Start difference. First operand 62 states and 119 transitions. Second operand has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-10-16 02:04:43,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:43,980 INFO L93 Difference]: Finished difference Result 138 states and 334 transitions. [2021-10-16 02:04:43,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-16 02:04:43,981 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) Word has length 35 [2021-10-16 02:04:43,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:43,985 INFO L225 Difference]: With dead ends: 138 [2021-10-16 02:04:43,985 INFO L226 Difference]: Without dead ends: 79 [2021-10-16 02:04:43,987 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 134.9ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-10-16 02:04:43,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-10-16 02:04:44,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2021-10-16 02:04:44,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 46 states have internal predecessors, (48), 17 states have call successors, (17), 3 states have call predecessors, (17), 16 states have return successors, (104), 26 states have call predecessors, (104), 17 states have call successors, (104) [2021-10-16 02:04:44,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 169 transitions. [2021-10-16 02:04:44,037 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 169 transitions. Word has length 35 [2021-10-16 02:04:44,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:44,037 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 169 transitions. [2021-10-16 02:04:44,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-10-16 02:04:44,039 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 169 transitions. [2021-10-16 02:04:44,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-16 02:04:44,046 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:44,046 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:44,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:44,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:44,464 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (21)] Ended with exit code 0 [2021-10-16 02:04:44,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:44,662 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:44,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:44,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1792243333, now seen corresponding path program 1 times [2021-10-16 02:04:44,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:44,663 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [405260907] [2021-10-16 02:04:44,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:44,663 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:44,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:44,665 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:44,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-10-16 02:04:45,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:45,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-16 02:04:45,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:45,240 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-16 02:04:45,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:45,917 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-16 02:04:45,917 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:45,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [405260907] [2021-10-16 02:04:45,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [405260907] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:45,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1907864693] [2021-10-16 02:04:45,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:45,917 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:45,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:45,918 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:45,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-10-16 02:04:46,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:46,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:04:46,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:46,633 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-10-16 02:04:46,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:47,124 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-16 02:04:47,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1907864693] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:47,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869245501] [2021-10-16 02:04:47,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:47,125 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:47,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:47,126 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:47,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-10-16 02:04:47,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:47,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:04:47,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:47,854 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-10-16 02:04:47,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:48,214 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-16 02:04:48,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869245501] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:48,215 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:04:48,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 8, 9, 8, 9] total 21 [2021-10-16 02:04:48,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241993316] [2021-10-16 02:04:48,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-10-16 02:04:48,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:48,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-16 02:04:48,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-10-16 02:04:48,218 INFO L87 Difference]: Start difference. First operand 76 states and 169 transitions. Second operand has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) [2021-10-16 02:04:49,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:49,230 INFO L93 Difference]: Finished difference Result 226 states and 729 transitions. [2021-10-16 02:04:49,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-16 02:04:49,231 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) Word has length 47 [2021-10-16 02:04:49,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:49,236 INFO L225 Difference]: With dead ends: 226 [2021-10-16 02:04:49,236 INFO L226 Difference]: Without dead ends: 148 [2021-10-16 02:04:49,239 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 595.1ms TimeCoverageRelationStatistics Valid=138, Invalid=732, Unknown=0, NotChecked=0, Total=870 [2021-10-16 02:04:49,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-10-16 02:04:49,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 121. [2021-10-16 02:04:49,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 67 states have (on average 1.1194029850746268) internal successors, (75), 71 states have internal predecessors, (75), 27 states have call successors, (27), 5 states have call predecessors, (27), 26 states have return successors, (221), 44 states have call predecessors, (221), 27 states have call successors, (221) [2021-10-16 02:04:49,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 323 transitions. [2021-10-16 02:04:49,276 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 323 transitions. Word has length 47 [2021-10-16 02:04:49,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:49,277 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 323 transitions. [2021-10-16 02:04:49,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) [2021-10-16 02:04:49,277 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 323 transitions. [2021-10-16 02:04:49,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-16 02:04:49,283 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:49,283 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:49,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:49,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:49,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:49,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:49,887 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:49,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:49,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1482129412, now seen corresponding path program 1 times [2021-10-16 02:04:49,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:49,888 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [81257785] [2021-10-16 02:04:49,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:49,888 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:49,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:49,890 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:49,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-10-16 02:04:50,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:50,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-16 02:04:50,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:50,625 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-16 02:04:50,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:51,140 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-16 02:04:51,141 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:51,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [81257785] [2021-10-16 02:04:51,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [81257785] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:51,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1632881966] [2021-10-16 02:04:51,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:51,142 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:51,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:51,143 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:51,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-10-16 02:04:51,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:51,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-16 02:04:51,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:51,953 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-16 02:04:51,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:52,392 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-16 02:04:52,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1632881966] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:52,392 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341438501] [2021-10-16 02:04:52,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:04:52,393 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:52,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:52,402 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:52,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-10-16 02:04:53,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:04:53,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-16 02:04:53,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:53,209 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-16 02:04:53,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:53,749 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-16 02:04:53,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341438501] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:53,750 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:04:53,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 9, 11, 9, 11] total 14 [2021-10-16 02:04:53,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111102624] [2021-10-16 02:04:53,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-16 02:04:53,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:53,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-16 02:04:53,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-10-16 02:04:53,752 INFO L87 Difference]: Start difference. First operand 121 states and 323 transitions. Second operand has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) [2021-10-16 02:04:54,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:54,125 INFO L93 Difference]: Finished difference Result 261 states and 901 transitions. [2021-10-16 02:04:54,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-16 02:04:54,126 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) Word has length 47 [2021-10-16 02:04:54,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:54,133 INFO L225 Difference]: With dead ends: 261 [2021-10-16 02:04:54,134 INFO L226 Difference]: Without dead ends: 139 [2021-10-16 02:04:54,138 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 153.2ms TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-10-16 02:04:54,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-10-16 02:04:54,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-10-16 02:04:54,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 77 states have (on average 1.103896103896104) internal successors, (85), 81 states have internal predecessors, (85), 30 states have call successors, (30), 5 states have call predecessors, (30), 31 states have return successors, (291), 52 states have call predecessors, (291), 30 states have call successors, (291) [2021-10-16 02:04:54,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 406 transitions. [2021-10-16 02:04:54,179 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 406 transitions. Word has length 47 [2021-10-16 02:04:54,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:54,180 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 406 transitions. [2021-10-16 02:04:54,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) [2021-10-16 02:04:54,181 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 406 transitions. [2021-10-16 02:04:54,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-10-16 02:04:54,188 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:54,188 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:54,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:54,405 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 0 [2021-10-16 02:04:54,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:54,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:04:54,803 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:04:54,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:04:54,804 INFO L82 PathProgramCache]: Analyzing trace with hash 503223527, now seen corresponding path program 3 times [2021-10-16 02:04:54,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:04:54,804 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1535798364] [2021-10-16 02:04:54,805 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-16 02:04:54,805 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:04:54,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:04:54,806 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:04:54,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-10-16 02:04:55,427 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-16 02:04:55,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:55,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:55,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:55,611 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-16 02:04:55,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:56,061 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-16 02:04:56,062 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:04:56,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1535798364] [2021-10-16 02:04:56,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1535798364] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:56,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1278458353] [2021-10-16 02:04:56,063 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-16 02:04:56,083 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:04:56,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:04:56,087 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:04:56,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-10-16 02:04:57,026 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-16 02:04:57,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:57,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 02:04:57,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:57,175 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-16 02:04:57,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:57,559 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-16 02:04:57,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1278458353] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:57,559 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225378162] [2021-10-16 02:04:57,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-16 02:04:57,559 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:04:57,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:04:57,560 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:04:57,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-10-16 02:04:58,307 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-16 02:04:58,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:04:58,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-16 02:04:58,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:04:58,552 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-16 02:04:58,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:04:59,238 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-16 02:04:59,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225378162] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:04:59,238 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:04:59,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 8] total 15 [2021-10-16 02:04:59,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360873970] [2021-10-16 02:04:59,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-16 02:04:59,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:04:59,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-16 02:04:59,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-10-16 02:04:59,241 INFO L87 Difference]: Start difference. First operand 139 states and 406 transitions. Second operand has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2021-10-16 02:04:59,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:04:59,560 INFO L93 Difference]: Finished difference Result 291 states and 1097 transitions. [2021-10-16 02:04:59,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-16 02:04:59,562 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) Word has length 59 [2021-10-16 02:04:59,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:04:59,568 INFO L225 Difference]: With dead ends: 291 [2021-10-16 02:04:59,568 INFO L226 Difference]: Without dead ends: 155 [2021-10-16 02:04:59,574 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 365.8ms TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-10-16 02:04:59,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-10-16 02:04:59,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 137. [2021-10-16 02:04:59,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 77 states have (on average 1.103896103896104) internal successors, (85), 80 states have internal predecessors, (85), 29 states have call successors, (29), 6 states have call predecessors, (29), 30 states have return successors, (259), 50 states have call predecessors, (259), 29 states have call successors, (259) [2021-10-16 02:04:59,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 373 transitions. [2021-10-16 02:04:59,630 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 373 transitions. Word has length 59 [2021-10-16 02:04:59,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:04:59,631 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 373 transitions. [2021-10-16 02:04:59,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2021-10-16 02:04:59,631 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 373 transitions. [2021-10-16 02:04:59,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-10-16 02:04:59,639 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:04:59,639 INFO L512 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:04:59,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-10-16 02:04:59,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-10-16 02:05:00,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-10-16 02:05:00,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:05:00,256 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:05:00,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:05:00,256 INFO L82 PathProgramCache]: Analyzing trace with hash -841814369, now seen corresponding path program 1 times [2021-10-16 02:05:00,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:05:00,257 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1944780456] [2021-10-16 02:05:00,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:05:00,257 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:05:00,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:05:00,261 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:05:00,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-10-16 02:05:01,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:05:01,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-16 02:05:01,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:05:01,767 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 32 proven. 224 refuted. 0 times theorem prover too weak. 585 trivial. 0 not checked. [2021-10-16 02:05:01,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:05:03,527 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 32 proven. 232 refuted. 0 times theorem prover too weak. 577 trivial. 0 not checked. [2021-10-16 02:05:03,527 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:05:03,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1944780456] [2021-10-16 02:05:03,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1944780456] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:05:03,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [175051566] [2021-10-16 02:05:03,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:05:03,528 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:05:03,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:05:03,534 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:05:03,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-10-16 02:05:04,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:05:04,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 17 conjunts are in the unsatisfiable core [2021-10-16 02:05:04,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:05:05,109 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 87 proven. 169 refuted. 0 times theorem prover too weak. 585 trivial. 0 not checked. [2021-10-16 02:05:05,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:05:06,735 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 102 proven. 126 refuted. 0 times theorem prover too weak. 613 trivial. 0 not checked. [2021-10-16 02:05:06,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [175051566] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:05:06,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891419140] [2021-10-16 02:05:06,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 02:05:06,736 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:05:06,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:05:06,739 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:05:06,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-10-16 02:05:07,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 02:05:07,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-16 02:05:07,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:05:08,595 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 258 proven. 73 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2021-10-16 02:05:08,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:05:10,348 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 258 proven. 99 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2021-10-16 02:05:10,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1891419140] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:05:10,348 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:05:10,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 9, 11, 12, 17] total 39 [2021-10-16 02:05:10,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287957994] [2021-10-16 02:05:10,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-10-16 02:05:10,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:05:10,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-10-16 02:05:10,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2021-10-16 02:05:10,353 INFO L87 Difference]: Start difference. First operand 137 states and 373 transitions. Second operand has 39 states, 36 states have (on average 2.9722222222222223) internal successors, (107), 39 states have internal predecessors, (107), 28 states have call successors, (39), 1 states have call predecessors, (39), 17 states have return successors, (54), 23 states have call predecessors, (54), 28 states have call successors, (54) [2021-10-16 02:05:14,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:05:14,337 INFO L93 Difference]: Finished difference Result 386 states and 1510 transitions. [2021-10-16 02:05:14,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-10-16 02:05:14,339 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 36 states have (on average 2.9722222222222223) internal successors, (107), 39 states have internal predecessors, (107), 28 states have call successors, (39), 1 states have call predecessors, (39), 17 states have return successors, (54), 23 states have call predecessors, (54), 28 states have call successors, (54) Word has length 168 [2021-10-16 02:05:14,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:05:14,350 INFO L225 Difference]: With dead ends: 386 [2021-10-16 02:05:14,351 INFO L226 Difference]: Without dead ends: 244 [2021-10-16 02:05:14,358 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1032 GetRequests, 965 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 923 ImplicationChecksByTransitivity, 2359.3ms TimeCoverageRelationStatistics Valid=646, Invalid=4046, Unknown=0, NotChecked=0, Total=4692 [2021-10-16 02:05:14,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-10-16 02:05:14,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 193. [2021-10-16 02:05:14,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 118 states have (on average 1.11864406779661) internal successors, (132), 117 states have internal predecessors, (132), 33 states have call successors, (33), 14 states have call predecessors, (33), 41 states have return successors, (343), 61 states have call predecessors, (343), 33 states have call successors, (343) [2021-10-16 02:05:14,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 508 transitions. [2021-10-16 02:05:14,408 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 508 transitions. Word has length 168 [2021-10-16 02:05:14,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:05:14,410 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 508 transitions. [2021-10-16 02:05:14,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 36 states have (on average 2.9722222222222223) internal successors, (107), 39 states have internal predecessors, (107), 28 states have call successors, (39), 1 states have call predecessors, (39), 17 states have return successors, (54), 23 states have call predecessors, (54), 28 states have call successors, (54) [2021-10-16 02:05:14,411 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 508 transitions. [2021-10-16 02:05:14,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-10-16 02:05:14,417 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:05:14,418 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:05:14,465 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-10-16 02:05:14,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2021-10-16 02:05:14,854 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-10-16 02:05:15,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:05:15,044 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:05:15,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:05:15,044 INFO L82 PathProgramCache]: Analyzing trace with hash 724043200, now seen corresponding path program 2 times [2021-10-16 02:05:15,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:05:15,045 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [774121210] [2021-10-16 02:05:15,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:05:15,045 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:05:15,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:05:15,046 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:05:15,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-10-16 02:05:16,111 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:05:16,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:05:16,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:05:16,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:05:16,422 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 28 proven. 39 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2021-10-16 02:05:16,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:05:17,115 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-10-16 02:05:17,115 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:05:17,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [774121210] [2021-10-16 02:05:17,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [774121210] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:05:17,116 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1954065102] [2021-10-16 02:05:17,116 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:05:17,116 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 02:05:17,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 02:05:17,123 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 02:05:17,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-10-16 02:05:18,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:05:18,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:05:18,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 28 conjunts are in the unsatisfiable core [2021-10-16 02:05:18,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:05:19,406 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2021-10-16 02:05:19,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:05:21,347 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 32 proven. 46 refuted. 0 times theorem prover too weak. 104 trivial. 0 not checked. [2021-10-16 02:05:21,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1954065102] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:05:21,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251796922] [2021-10-16 02:05:21,348 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 02:05:21,348 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:05:21,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 02:05:21,349 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 02:05:21,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-10-16 02:05:22,713 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 02:05:22,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:05:22,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-16 02:05:22,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:05:23,162 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 117 proven. 12 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-10-16 02:05:23,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:05:24,065 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 41 proven. 43 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-10-16 02:05:24,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251796922] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 02:05:24,065 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 02:05:24,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 21, 26, 10, 9] total 56 [2021-10-16 02:05:24,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563333798] [2021-10-16 02:05:24,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-10-16 02:05:24,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:05:24,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-10-16 02:05:24,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=2888, Unknown=0, NotChecked=0, Total=3080 [2021-10-16 02:05:24,070 INFO L87 Difference]: Start difference. First operand 193 states and 508 transitions. Second operand has 56 states, 44 states have (on average 2.2954545454545454) internal successors, (101), 32 states have internal predecessors, (101), 21 states have call successors, (33), 2 states have call predecessors, (33), 20 states have return successors, (52), 34 states have call predecessors, (52), 21 states have call successors, (52) [2021-10-16 02:05:32,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:05:32,799 INFO L93 Difference]: Finished difference Result 496 states and 1846 transitions. [2021-10-16 02:05:32,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-10-16 02:05:32,801 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 44 states have (on average 2.2954545454545454) internal successors, (101), 32 states have internal predecessors, (101), 21 states have call successors, (33), 2 states have call predecessors, (33), 20 states have return successors, (52), 34 states have call predecessors, (52), 21 states have call successors, (52) Word has length 86 [2021-10-16 02:05:32,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:05:32,810 INFO L225 Difference]: With dead ends: 496 [2021-10-16 02:05:32,810 INFO L226 Difference]: Without dead ends: 292 [2021-10-16 02:05:32,824 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 456 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3515 ImplicationChecksByTransitivity, 7249.9ms TimeCoverageRelationStatistics Valid=1124, Invalid=13882, Unknown=0, NotChecked=0, Total=15006 [2021-10-16 02:05:32,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-10-16 02:05:32,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 225. [2021-10-16 02:05:32,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 140 states have (on average 1.1571428571428573) internal successors, (162), 140 states have internal predecessors, (162), 41 states have call successors, (41), 21 states have call predecessors, (41), 43 states have return successors, (294), 63 states have call predecessors, (294), 41 states have call successors, (294) [2021-10-16 02:05:32,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 497 transitions. [2021-10-16 02:05:32,895 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 497 transitions. Word has length 86 [2021-10-16 02:05:32,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:05:32,896 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 497 transitions. [2021-10-16 02:05:32,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 44 states have (on average 2.2954545454545454) internal successors, (101), 32 states have internal predecessors, (101), 21 states have call successors, (33), 2 states have call predecessors, (33), 20 states have return successors, (52), 34 states have call predecessors, (52), 21 states have call successors, (52) [2021-10-16 02:05:32,897 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 497 transitions. [2021-10-16 02:05:32,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-10-16 02:05:32,906 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:05:32,906 INFO L512 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 10, 9, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:05:32,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-10-16 02:05:33,125 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-10-16 02:05:33,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-10-16 02:05:33,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 02:05:33,513 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:05:33,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:05:33,514 INFO L82 PathProgramCache]: Analyzing trace with hash 2007696498, now seen corresponding path program 3 times [2021-10-16 02:05:33,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:05:33,515 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1945707277] [2021-10-16 02:05:33,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-16 02:05:33,515 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:05:33,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:05:33,517 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:05:33,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-10-16 02:05:34,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-16 02:05:34,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 02:05:34,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 02:05:34,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 02:05:35,208 INFO L134 CoverageAnalysis]: Checked inductivity of 865 backedges. 198 proven. 0 refuted. 0 times theorem prover too weak. 667 trivial. 0 not checked. [2021-10-16 02:05:35,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 02:05:36,421 INFO L134 CoverageAnalysis]: Checked inductivity of 865 backedges. 190 proven. 0 refuted. 0 times theorem prover too weak. 675 trivial. 0 not checked. [2021-10-16 02:05:36,421 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 02:05:36,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1945707277] [2021-10-16 02:05:36,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1945707277] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 02:05:36,422 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 02:05:36,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 9] imperfect sequences [] total 12 [2021-10-16 02:05:36,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772518026] [2021-10-16 02:05:36,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-16 02:05:36,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 02:05:36,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-16 02:05:36,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-10-16 02:05:36,424 INFO L87 Difference]: Start difference. First operand 225 states and 497 transitions. Second operand has 12 states, 9 states have (on average 4.111111111111111) internal successors, (37), 11 states have internal predecessors, (37), 5 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (11), 3 states have call predecessors, (11), 5 states have call successors, (11) [2021-10-16 02:05:36,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 02:05:36,705 INFO L93 Difference]: Finished difference Result 390 states and 1016 transitions. [2021-10-16 02:05:36,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-16 02:05:36,706 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 4.111111111111111) internal successors, (37), 11 states have internal predecessors, (37), 5 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (11), 3 states have call predecessors, (11), 5 states have call successors, (11) Word has length 172 [2021-10-16 02:05:36,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 02:05:36,711 INFO L225 Difference]: With dead ends: 390 [2021-10-16 02:05:36,711 INFO L226 Difference]: Without dead ends: 154 [2021-10-16 02:05:36,716 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 248.3ms TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-10-16 02:05:36,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-10-16 02:05:36,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2021-10-16 02:05:36,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 96 states have (on average 1.1041666666666667) internal successors, (106), 94 states have internal predecessors, (106), 29 states have call successors, (29), 16 states have call predecessors, (29), 27 states have return successors, (182), 42 states have call predecessors, (182), 29 states have call successors, (182) [2021-10-16 02:05:36,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 317 transitions. [2021-10-16 02:05:36,739 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 317 transitions. Word has length 172 [2021-10-16 02:05:36,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 02:05:36,740 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 317 transitions. [2021-10-16 02:05:36,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 4.111111111111111) internal successors, (37), 11 states have internal predecessors, (37), 5 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (11), 3 states have call predecessors, (11), 5 states have call successors, (11) [2021-10-16 02:05:36,741 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 317 transitions. [2021-10-16 02:05:36,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-10-16 02:05:36,745 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 02:05:36,746 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 02:05:36,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-10-16 02:05:36,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:05:36,965 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-16 02:05:36,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 02:05:36,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1106940688, now seen corresponding path program 4 times [2021-10-16 02:05:36,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 02:05:36,966 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1573779609] [2021-10-16 02:05:36,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-16 02:05:36,966 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 02:05:36,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 02:05:36,968 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 02:05:37,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-10-16 02:05:38,320 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-16 02:05:38,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-10-16 02:05:38,321 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-16 02:05:38,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-16 02:05:38,544 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-16 02:05:38,544 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-16 02:05:38,545 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-16 02:05:38,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-10-16 02:05:38,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 02:05:38,775 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-16 02:05:38,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 16.10 02:05:38 BoogieIcfgContainer [2021-10-16 02:05:38,958 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-16 02:05:38,958 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-16 02:05:38,959 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-16 02:05:38,959 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-16 02:05:38,960 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 02:04:20" (3/4) ... [2021-10-16 02:05:38,963 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-16 02:05:39,068 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/witness.graphml [2021-10-16 02:05:39,069 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-16 02:05:39,071 INFO L168 Benchmark]: Toolchain (without parser) took 79697.90 ms. Allocated memory was 58.7 MB in the beginning and 163.6 MB in the end (delta: 104.9 MB). Free memory was 39.3 MB in the beginning and 69.2 MB in the end (delta: -29.9 MB). Peak memory consumption was 76.3 MB. Max. memory is 16.1 GB. [2021-10-16 02:05:39,072 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 58.7 MB. Free memory was 41.0 MB in the beginning and 40.9 MB in the end (delta: 50.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:05:39,072 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.48 ms. Allocated memory is still 58.7 MB. Free memory was 39.1 MB in the beginning and 29.3 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-16 02:05:39,073 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.72 ms. Allocated memory is still 58.7 MB. Free memory was 29.2 MB in the beginning and 27.9 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 02:05:39,073 INFO L168 Benchmark]: Boogie Preprocessor took 35.45 ms. Allocated memory is still 58.7 MB. Free memory was 27.9 MB in the beginning and 42.7 MB in the end (delta: -14.8 MB). Peak memory consumption was 5.0 MB. Max. memory is 16.1 GB. [2021-10-16 02:05:39,074 INFO L168 Benchmark]: RCFGBuilder took 351.52 ms. Allocated memory is still 58.7 MB. Free memory was 42.7 MB in the beginning and 32.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-16 02:05:39,074 INFO L168 Benchmark]: TraceAbstraction took 78902.24 ms. Allocated memory was 58.7 MB in the beginning and 163.6 MB in the end (delta: 104.9 MB). Free memory was 32.3 MB in the beginning and 75.0 MB in the end (delta: -42.7 MB). Peak memory consumption was 109.1 MB. Max. memory is 16.1 GB. [2021-10-16 02:05:39,075 INFO L168 Benchmark]: Witness Printer took 110.56 ms. Allocated memory is still 163.6 MB. Free memory was 75.0 MB in the beginning and 69.2 MB in the end (delta: 5.8 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-10-16 02:05:39,078 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 58.7 MB. Free memory was 41.0 MB in the beginning and 40.9 MB in the end (delta: 50.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 255.48 ms. Allocated memory is still 58.7 MB. Free memory was 39.1 MB in the beginning and 29.3 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 35.72 ms. Allocated memory is still 58.7 MB. Free memory was 29.2 MB in the beginning and 27.9 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 35.45 ms. Allocated memory is still 58.7 MB. Free memory was 27.9 MB in the beginning and 42.7 MB in the end (delta: -14.8 MB). Peak memory consumption was 5.0 MB. Max. memory is 16.1 GB. * RCFGBuilder took 351.52 ms. Allocated memory is still 58.7 MB. Free memory was 42.7 MB in the beginning and 32.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 78902.24 ms. Allocated memory was 58.7 MB in the beginning and 163.6 MB in the end (delta: 104.9 MB). Free memory was 32.3 MB in the beginning and 75.0 MB in the end (delta: -42.7 MB). Peak memory consumption was 109.1 MB. Max. memory is 16.1 GB. * Witness Printer took 110.56 ms. Allocated memory is still 163.6 MB. Free memory was 75.0 MB in the beginning and 69.2 MB in the end (delta: 5.8 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 5; [L39] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L10] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L12] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L20] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L22] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L10] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L12] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) [L39] int result = fibo1(x); [L40] COND TRUE result == 5 [L41] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 78649.2ms, OverallIterations: 16, TraceHistogramMax: 15, EmptinessCheckTime: 86.2ms, AutomataDifference: 17872.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 14.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 402 SDtfs, 538 SDslu, 3275 SDs, 0 SdLazy, 6864 SolverSat, 959 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 7896.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4129 GetRequests, 3714 SyntacticMatches, 0 SemanticMatches, 415 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5072 ImplicationChecksByTransitivity, 14097.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=225occurred in iteration=14, InterpolantAutomatonStates: 247, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 541.4ms AutomataMinimizationTime, 15 MinimizatonAttempts, 248 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 324.1ms SsaConstructionTime, 1320.1ms SatisfiabilityAnalysisTime, 31123.2ms InterpolantComputationTime, 2117 NumberOfCodeBlocks, 1922 NumberOfCodeBlocksAsserted, 56 NumberOfCheckSat, 3962 ConstructedInterpolants, 0 QuantifiedInterpolants, 8513 SizeOfPredicates, 105 NumberOfNonLiveVariables, 3249 ConjunctsInSsa, 330 ConjunctsInUnsatCore, 74 InterpolantComputations, 11 PerfectInterpolantSequences, 7693/9328 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: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-16 02:05:39,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_813fec0c-9b42-4c53-9372-4bde5f0f1875/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...