./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/nested_1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/nested_1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI --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 3307686edde000bd6f2709f8ce62af668302d3bc .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2021-10-11 02:21:24,713 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-11 02:21:24,715 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-11 02:21:24,758 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-11 02:21:24,762 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-11 02:21:24,768 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-11 02:21:24,773 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-11 02:21:24,778 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-11 02:21:24,781 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-11 02:21:24,790 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-11 02:21:24,791 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-11 02:21:24,793 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-11 02:21:24,793 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-11 02:21:24,797 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-11 02:21:24,799 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-11 02:21:24,801 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-11 02:21:24,803 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-11 02:21:24,804 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-11 02:21:24,810 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-11 02:21:24,820 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-11 02:21:24,823 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-11 02:21:24,825 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-11 02:21:24,829 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-11 02:21:24,830 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-11 02:21:24,834 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-11 02:21:24,834 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-11 02:21:24,835 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-11 02:21:24,837 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-11 02:21:24,838 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-11 02:21:24,840 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-11 02:21:24,840 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-11 02:21:24,841 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-11 02:21:24,843 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-11 02:21:24,844 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-11 02:21:24,846 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-11 02:21:24,847 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-11 02:21:24,848 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-11 02:21:24,848 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-11 02:21:24,848 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-11 02:21:24,849 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-11 02:21:24,850 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-11 02:21:24,853 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-11 02:21:24,903 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-11 02:21:24,903 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-11 02:21:24,905 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-11 02:21:24,905 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-11 02:21:24,906 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-11 02:21:24,906 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-11 02:21:24,906 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-11 02:21:24,906 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-11 02:21:24,907 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-11 02:21:24,907 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-11 02:21:24,908 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-11 02:21:24,908 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-11 02:21:24,909 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-11 02:21:24,909 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-11 02:21:24,909 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-11 02:21:24,910 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-11 02:21:24,910 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-11 02:21:24,910 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-11 02:21:24,911 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-11 02:21:24,911 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-11 02:21:24,911 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-11 02:21:24,911 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-11 02:21:24,912 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-11 02:21:24,912 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-11 02:21:24,912 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-11 02:21:24,912 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-11 02:21:24,912 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-11 02:21:24,913 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-11 02:21:24,913 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-11 02:21:24,915 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-11 02:21:24,916 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:21:24,916 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-11 02:21:24,916 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-11 02:21:24,917 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-11 02:21:24,917 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-11 02:21:24,917 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-11 02:21:24,917 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-11 02:21:24,917 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-11 02:21:24,918 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-11 02:21:24,918 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_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3307686edde000bd6f2709f8ce62af668302d3bc [2021-10-11 02:21:25,211 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-11 02:21:25,233 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-11 02:21:25,238 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-11 02:21:25,239 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-11 02:21:25,240 INFO L275 PluginConnector]: CDTParser initialized [2021-10-11 02:21:25,241 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/../../sv-benchmarks/c/loop-acceleration/nested_1-1.c [2021-10-11 02:21:25,327 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/data/001771628/70abe321604b428e84cb3b3d62e28707/FLAG30dcbf4b0 [2021-10-11 02:21:25,751 INFO L306 CDTParser]: Found 1 translation units. [2021-10-11 02:21:25,751 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/sv-benchmarks/c/loop-acceleration/nested_1-1.c [2021-10-11 02:21:25,762 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/data/001771628/70abe321604b428e84cb3b3d62e28707/FLAG30dcbf4b0 [2021-10-11 02:21:26,144 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/data/001771628/70abe321604b428e84cb3b3d62e28707 [2021-10-11 02:21:26,147 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-11 02:21:26,148 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-11 02:21:26,150 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-11 02:21:26,150 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-11 02:21:26,154 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-11 02:21:26,154 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,156 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29ded806 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26, skipping insertion in model container [2021-10-11 02:21:26,157 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,164 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-11 02:21:26,177 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-11 02:21:26,306 WARN L226 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_4c460a10-c7c9-4289-8110-e744443869e5/sv-benchmarks/c/loop-acceleration/nested_1-1.c[322,335] [2021-10-11 02:21:26,336 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:21:26,345 INFO L203 MainTranslator]: Completed pre-run [2021-10-11 02:21:26,355 WARN L226 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_4c460a10-c7c9-4289-8110-e744443869e5/sv-benchmarks/c/loop-acceleration/nested_1-1.c[322,335] [2021-10-11 02:21:26,358 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:21:26,372 INFO L208 MainTranslator]: Completed translation [2021-10-11 02:21:26,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26 WrapperNode [2021-10-11 02:21:26,373 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-11 02:21:26,374 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-11 02:21:26,374 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-11 02:21:26,375 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-11 02:21:26,383 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,390 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,408 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-11 02:21:26,409 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-11 02:21:26,409 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-11 02:21:26,410 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-11 02:21:26,418 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,418 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,420 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,420 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,423 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,428 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,429 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... [2021-10-11 02:21:26,430 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-11 02:21:26,431 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-11 02:21:26,432 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-11 02:21:26,432 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-11 02:21:26,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (1/1) ... No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:21:26,534 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-11 02:21:26,534 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-11 02:21:26,534 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-11 02:21:26,535 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-11 02:21:26,846 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-11 02:21:26,846 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-10-11 02:21:26,848 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:21:26 BoogieIcfgContainer [2021-10-11 02:21:26,848 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-11 02:21:26,850 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-11 02:21:26,850 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-11 02:21:26,866 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-11 02:21:26,867 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 02:21:26" (1/3) ... [2021-10-11 02:21:26,868 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5768e1da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:21:26, skipping insertion in model container [2021-10-11 02:21:26,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:21:26" (2/3) ... [2021-10-11 02:21:26,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5768e1da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:21:26, skipping insertion in model container [2021-10-11 02:21:26,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:21:26" (3/3) ... [2021-10-11 02:21:26,870 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1-1.c [2021-10-11 02:21:26,896 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-11 02:21:26,899 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-10-11 02:21:26,909 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-11 02:21:26,933 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-10-11 02:21:26,934 INFO L378 AbstractCegarLoop]: Hoare is true [2021-10-11 02:21:26,934 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-10-11 02:21:26,934 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-10-11 02:21:26,934 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-10-11 02:21:26,934 INFO L382 AbstractCegarLoop]: Difference is false [2021-10-11 02:21:26,935 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-10-11 02:21:26,935 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-10-11 02:21:26,947 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2021-10-11 02:21:26,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-10-11 02:21:26,952 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:21:26,953 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-10-11 02:21:26,953 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:21:26,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:21:26,963 INFO L82 PathProgramCache]: Analyzing trace with hash 2220904, now seen corresponding path program 1 times [2021-10-11 02:21:26,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:21:26,977 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942144826] [2021-10-11 02:21:26,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:21:27,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:27,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:21:27,143 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942144826] [2021-10-11 02:21:27,144 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:21:27,144 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-11 02:21:27,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471557261] [2021-10-11 02:21:27,149 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-10-11 02:21:27,150 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:21:27,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-11 02:21:27,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-11 02:21:27,166 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 3 states. [2021-10-11 02:21:27,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:21:27,194 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2021-10-11 02:21:27,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-11 02:21:27,196 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2021-10-11 02:21:27,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:21:27,204 INFO L225 Difference]: With dead ends: 15 [2021-10-11 02:21:27,204 INFO L226 Difference]: Without dead ends: 8 [2021-10-11 02:21:27,206 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-11 02:21:27,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-10-11 02:21:27,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2021-10-11 02:21:27,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-10-11 02:21:27,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2021-10-11 02:21:27,237 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2021-10-11 02:21:27,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:21:27,238 INFO L481 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2021-10-11 02:21:27,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-10-11 02:21:27,238 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2021-10-11 02:21:27,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-11 02:21:27,239 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:21:27,239 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-11 02:21:27,239 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-11 02:21:27,239 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:21:27,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:21:27,240 INFO L82 PathProgramCache]: Analyzing trace with hash 2101473510, now seen corresponding path program 1 times [2021-10-11 02:21:27,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:21:27,241 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389552820] [2021-10-11 02:21:27,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:21:27,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:27,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:21:27,289 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389552820] [2021-10-11 02:21:27,289 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:21:27,290 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-11 02:21:27,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516723550] [2021-10-11 02:21:27,291 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-10-11 02:21:27,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:21:27,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-11 02:21:27,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-11 02:21:27,293 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 3 states. [2021-10-11 02:21:27,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:21:27,312 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2021-10-11 02:21:27,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-11 02:21:27,313 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2021-10-11 02:21:27,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:21:27,313 INFO L225 Difference]: With dead ends: 13 [2021-10-11 02:21:27,313 INFO L226 Difference]: Without dead ends: 8 [2021-10-11 02:21:27,314 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-11 02:21:27,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-10-11 02:21:27,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-10-11 02:21:27,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-10-11 02:21:27,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-10-11 02:21:27,317 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2021-10-11 02:21:27,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:21:27,318 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-10-11 02:21:27,318 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-10-11 02:21:27,318 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-10-11 02:21:27,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-11 02:21:27,319 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:21:27,319 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:21:27,319 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-11 02:21:27,319 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:21:27,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:21:27,320 INFO L82 PathProgramCache]: Analyzing trace with hash 698037110, now seen corresponding path program 1 times [2021-10-11 02:21:27,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:21:27,321 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177928544] [2021-10-11 02:21:27,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:21:27,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:27,431 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:21:27,431 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177928544] [2021-10-11 02:21:27,432 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222664521] [2021-10-11 02:21:27,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:21:27,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:27,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-11 02:21:27,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:21:27,577 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:21:27,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:21:27,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:21:27,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [875172344] [2021-10-11 02:21:27,643 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-10-11 02:21:27,643 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:21:27,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:21:27,656 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:21:27,656 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:21:28,710 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:21:28,718 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:21:28,718 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 3] total 9 [2021-10-11 02:21:28,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631365568] [2021-10-11 02:21:28,719 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-10-11 02:21:28,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:21:28,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-11 02:21:28,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-10-11 02:21:28,722 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand 9 states. [2021-10-11 02:21:28,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:21:28,966 INFO L93 Difference]: Finished difference Result 27 states and 39 transitions. [2021-10-11 02:21:28,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-11 02:21:28,967 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 7 [2021-10-11 02:21:28,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:21:28,969 INFO L225 Difference]: With dead ends: 27 [2021-10-11 02:21:28,971 INFO L226 Difference]: Without dead ends: 21 [2021-10-11 02:21:28,974 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=177, Unknown=0, NotChecked=0, Total=272 [2021-10-11 02:21:28,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-10-11 02:21:28,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-10-11 02:21:28,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2021-10-11 02:21:28,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-10-11 02:21:28,984 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 7 [2021-10-11 02:21:28,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:21:28,985 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-10-11 02:21:28,985 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-10-11 02:21:28,985 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-10-11 02:21:28,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-10-11 02:21:28,986 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:21:28,986 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1] [2021-10-11 02:21:29,201 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-10-11 02:21:29,202 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:21:29,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:21:29,202 INFO L82 PathProgramCache]: Analyzing trace with hash 1840367456, now seen corresponding path program 2 times [2021-10-11 02:21:29,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:21:29,203 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047165953] [2021-10-11 02:21:29,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:21:29,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:29,326 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-10-11 02:21:29,327 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047165953] [2021-10-11 02:21:29,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880431779] [2021-10-11 02:21:29,328 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:21:29,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-10-11 02:21:29,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:21:29,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-11 02:21:29,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:21:29,475 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-10-11 02:21:29,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:21:29,531 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 31 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-10-11 02:21:29,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [750833908] [2021-10-11 02:21:29,536 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-10-11 02:21:29,537 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:21:29,537 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:21:29,538 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:21:29,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:21:29,955 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:21:29,956 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:21:29,956 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-10-11 02:21:29,957 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905258236] [2021-10-11 02:21:29,958 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-10-11 02:21:29,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:21:29,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-11 02:21:29,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-10-11 02:21:29,960 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2021-10-11 02:21:30,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:21:30,065 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-10-11 02:21:30,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-11 02:21:30,066 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2021-10-11 02:21:30,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:21:30,068 INFO L225 Difference]: With dead ends: 53 [2021-10-11 02:21:30,068 INFO L226 Difference]: Without dead ends: 37 [2021-10-11 02:21:30,069 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=62, Unknown=0, NotChecked=0, Total=110 [2021-10-11 02:21:30,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-10-11 02:21:30,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-10-11 02:21:30,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2021-10-11 02:21:30,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-10-11 02:21:30,083 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 20 [2021-10-11 02:21:30,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:21:30,083 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-10-11 02:21:30,083 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-10-11 02:21:30,083 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-10-11 02:21:30,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-11 02:21:30,085 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:21:30,085 INFO L422 BasicCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1] [2021-10-11 02:21:30,292 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:21:30,293 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:21:30,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:21:30,294 INFO L82 PathProgramCache]: Analyzing trace with hash -380781216, now seen corresponding path program 3 times [2021-10-11 02:21:30,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:21:30,295 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442681143] [2021-10-11 02:21:30,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:21:30,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:30,512 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-10-11 02:21:30,513 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442681143] [2021-10-11 02:21:30,513 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160732729] [2021-10-11 02:21:30,513 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:21:30,582 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-11 02:21:30,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:21:30,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-11 02:21:30,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:21:30,668 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-10-11 02:21:30,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:21:30,855 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 151 proven. 21 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-10-11 02:21:30,856 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1855138940] [2021-10-11 02:21:30,860 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-10-11 02:21:30,860 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:21:30,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:21:30,861 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:21:30,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:21:31,319 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:21:31,321 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:21:31,321 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-10-11 02:21:31,321 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973684413] [2021-10-11 02:21:31,323 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-10-11 02:21:31,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:21:31,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-11 02:21:31,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=187, Unknown=0, NotChecked=0, Total=272 [2021-10-11 02:21:31,324 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 17 states. [2021-10-11 02:21:31,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:21:31,521 INFO L93 Difference]: Finished difference Result 81 states and 104 transitions. [2021-10-11 02:21:31,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-11 02:21:31,524 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2021-10-11 02:21:31,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:21:31,530 INFO L225 Difference]: With dead ends: 81 [2021-10-11 02:21:31,531 INFO L226 Difference]: Without dead ends: 53 [2021-10-11 02:21:31,532 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=231, Unknown=0, NotChecked=0, Total=342 [2021-10-11 02:21:31,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-11 02:21:31,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-10-11 02:21:31,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2021-10-11 02:21:31,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-10-11 02:21:31,545 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 36 [2021-10-11 02:21:31,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:21:31,545 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-10-11 02:21:31,545 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-10-11 02:21:31,545 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-10-11 02:21:31,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-10-11 02:21:31,550 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:21:31,550 INFO L422 BasicCegarLoop]: trace histogram [40, 4, 4, 1, 1, 1, 1] [2021-10-11 02:21:31,773 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:21:31,773 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:21:31,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:21:31,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1277342560, now seen corresponding path program 4 times [2021-10-11 02:21:31,774 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:21:31,774 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478249331] [2021-10-11 02:21:31,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:21:31,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:32,004 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-10-11 02:21:32,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478249331] [2021-10-11 02:21:32,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602420038] [2021-10-11 02:21:32,005 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:21:32,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:32,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-11 02:21:32,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:21:32,188 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-10-11 02:21:32,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:21:32,323 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-10-11 02:21:32,323 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1359990820] [2021-10-11 02:21:32,326 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-10-11 02:21:32,326 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:21:32,326 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-11 02:21:32,326 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-11 02:21:32,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-11 02:21:32,653 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) 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:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:21:32,653 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:21:32,654 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-10-11 02:21:32,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908290651] [2021-10-11 02:21:32,655 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-10-11 02:21:32,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:21:32,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-10-11 02:21:32,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=98, Unknown=0, NotChecked=0, Total=156 [2021-10-11 02:21:32,657 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 13 states. [2021-10-11 02:21:33,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:21:33,043 INFO L93 Difference]: Finished difference Result 128 states and 143 transitions. [2021-10-11 02:21:33,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-11 02:21:33,043 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 52 [2021-10-11 02:21:33,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:21:33,045 INFO L225 Difference]: With dead ends: 128 [2021-10-11 02:21:33,045 INFO L226 Difference]: Without dead ends: 125 [2021-10-11 02:21:33,046 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=110, Invalid=162, Unknown=0, NotChecked=0, Total=272 [2021-10-11 02:21:33,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-10-11 02:21:33,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-10-11 02:21:33,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2021-10-11 02:21:33,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 135 transitions. [2021-10-11 02:21:33,087 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 135 transitions. Word has length 52 [2021-10-11 02:21:33,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:21:33,089 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 135 transitions. [2021-10-11 02:21:33,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-10-11 02:21:33,090 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 135 transitions. [2021-10-11 02:21:33,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-10-11 02:21:33,094 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:21:33,094 INFO L422 BasicCegarLoop]: trace histogram [100, 10, 10, 1, 1, 1, 1] [2021-10-11 02:21:33,321 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:21:33,321 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:21:33,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:21:33,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1533680300, now seen corresponding path program 5 times [2021-10-11 02:21:33,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:21:33,322 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633496556] [2021-10-11 02:21:33,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:21:33,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:21:33,745 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 0 proven. 5500 refuted. 0 times theorem prover too weak. 550 trivial. 0 not checked. [2021-10-11 02:21:33,746 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633496556] [2021-10-11 02:21:33,746 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932307090] [2021-10-11 02:21:33,746 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:21:34,023 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-10-11 02:21:34,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:21:34,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-11 02:21:34,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:21:34,387 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 1099 proven. 0 refuted. 0 times theorem prover too weak. 4951 trivial. 0 not checked. [2021-10-11 02:21:34,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:21:34,628 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 1099 proven. 0 refuted. 0 times theorem prover too weak. 4951 trivial. 0 not checked. [2021-10-11 02:21:34,628 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-11 02:21:34,628 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [12] total 19 [2021-10-11 02:21:34,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989708048] [2021-10-11 02:21:34,629 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-10-11 02:21:34,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:21:34,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-11 02:21:34,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2021-10-11 02:21:34,631 INFO L87 Difference]: Start difference. First operand 125 states and 135 transitions. Second operand 8 states. [2021-10-11 02:21:34,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:21:34,775 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2021-10-11 02:21:34,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-11 02:21:34,776 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 124 [2021-10-11 02:21:34,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:21:34,777 INFO L225 Difference]: With dead ends: 125 [2021-10-11 02:21:34,777 INFO L226 Difference]: Without dead ends: 0 [2021-10-11 02:21:34,778 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2021-10-11 02:21:34,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-11 02:21:34,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-11 02:21:34,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2021-10-11 02:21:34,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-11 02:21:34,779 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 124 [2021-10-11 02:21:34,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:21:34,779 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-11 02:21:34,779 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-10-11 02:21:34,779 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-11 02:21:34,779 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-11 02:21:34,983 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable168 [2021-10-11 02:21:34,985 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-11 02:21:35,104 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-11 02:21:35,104 INFO L258 CegarLoopResult]: At program point L19-2(lines 19 21) the Hoare annotation is: (or (= ULTIMATE.start_main_~x~0 0) (and (< (mod (+ ULTIMATE.start_main_~x~0 4294967295) 4294967296) 268435455) (< (mod ULTIMATE.start_main_~x~0 4294967296) 268435455))) [2021-10-11 02:21:35,105 INFO L262 CegarLoopResult]: For program point L7(line 7) no Hoare annotation was computed. [2021-10-11 02:21:35,105 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-11 02:21:35,105 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 7) no Hoare annotation was computed. [2021-10-11 02:21:35,105 INFO L258 CegarLoopResult]: At program point L16-2(lines 16 24) the Hoare annotation is: (or (and (= ULTIMATE.start_main_~x~0 0) (= ULTIMATE.start_main_~y~0 0)) (< (mod (+ ULTIMATE.start_main_~x~0 4294967295) 4294967296) 268435455)) [2021-10-11 02:21:35,105 INFO L262 CegarLoopResult]: For program point L6(lines 6 8) no Hoare annotation was computed. [2021-10-11 02:21:35,105 INFO L265 CegarLoopResult]: At program point L6-2(lines 1 27) the Hoare annotation is: true [2021-10-11 02:21:35,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.10 02:21:35 BoogieIcfgContainer [2021-10-11 02:21:35,122 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-11 02:21:35,123 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-11 02:21:35,123 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-11 02:21:35,123 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-11 02:21:35,124 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:21:26" (3/4) ... [2021-10-11 02:21:35,127 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-11 02:21:35,134 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2021-10-11 02:21:35,134 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2021-10-11 02:21:35,135 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-11 02:21:35,135 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-11 02:21:35,165 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4c460a10-c7c9-4289-8110-e744443869e5/bin/utaipan-WLngWcDbfI/witness.graphml [2021-10-11 02:21:35,165 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-11 02:21:35,166 INFO L168 Benchmark]: Toolchain (without parser) took 9017.22 ms. Allocated memory was 102.8 MB in the beginning and 148.9 MB in the end (delta: 46.1 MB). Free memory was 62.9 MB in the beginning and 44.4 MB in the end (delta: 18.5 MB). Peak memory consumption was 64.9 MB. Max. memory is 16.1 GB. [2021-10-11 02:21:35,166 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 102.8 MB. Free memory is still 79.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:21:35,167 INFO L168 Benchmark]: CACSL2BoogieTranslator took 223.28 ms. Allocated memory is still 102.8 MB. Free memory was 62.7 MB in the beginning and 77.9 MB in the end (delta: -15.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-11 02:21:35,167 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.27 ms. Allocated memory is still 102.8 MB. Free memory was 77.9 MB in the beginning and 76.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:21:35,168 INFO L168 Benchmark]: Boogie Preprocessor took 21.82 ms. Allocated memory is still 102.8 MB. Free memory was 76.3 MB in the beginning and 75.4 MB in the end (delta: 911.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:21:35,168 INFO L168 Benchmark]: RCFGBuilder took 417.08 ms. Allocated memory is still 102.8 MB. Free memory was 75.1 MB in the beginning and 61.2 MB in the end (delta: 14.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-11 02:21:35,168 INFO L168 Benchmark]: TraceAbstraction took 8272.27 ms. Allocated memory was 102.8 MB in the beginning and 148.9 MB in the end (delta: 46.1 MB). Free memory was 60.7 MB in the beginning and 46.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 63.2 MB. Max. memory is 16.1 GB. [2021-10-11 02:21:35,169 INFO L168 Benchmark]: Witness Printer took 41.92 ms. Allocated memory is still 148.9 MB. Free memory was 46.5 MB in the beginning and 44.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:21:35,171 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 102.8 MB. Free memory is still 79.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 223.28 ms. Allocated memory is still 102.8 MB. Free memory was 62.7 MB in the beginning and 77.9 MB in the end (delta: -15.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 34.27 ms. Allocated memory is still 102.8 MB. Free memory was 77.9 MB in the beginning and 76.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 21.82 ms. Allocated memory is still 102.8 MB. Free memory was 76.3 MB in the beginning and 75.4 MB in the end (delta: 911.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 417.08 ms. Allocated memory is still 102.8 MB. Free memory was 75.1 MB in the beginning and 61.2 MB in the end (delta: 14.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 8272.27 ms. Allocated memory was 102.8 MB in the beginning and 148.9 MB in the end (delta: 46.1 MB). Free memory was 60.7 MB in the beginning and 46.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 63.2 MB. Max. memory is 16.1 GB. * Witness Printer took 41.92 ms. Allocated memory is still 148.9 MB. Free memory was 46.5 MB in the beginning and 44.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 7]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 19]: Loop Invariant Derived loop invariant: x == 0 || ((x + 4294967295) % 4294967296 < 268435455 && x % 4294967296 < 268435455) - InvariantResult [Line: 16]: Loop Invariant Derived loop invariant: (x == 0 && y == 0) || (x + 4294967295) % 4294967296 < 268435455 - InvariantResult [Line: 1]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 8 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.0s, OverallIterations: 7, TraceHistogramMax: 100, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 41 SDtfs, 37 SDslu, 97 SDs, 0 SdLazy, 209 SolverSat, 64 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 527 GetRequests, 447 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 1.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=125occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 3 PreInvPairs, 125 NumberOfFragments, 33 HoareAnnotationTreeSize, 3 FomulaSimplifications, 3255 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 3 FomulaSimplificationsInter, 11 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 2.1s InterpolantComputationTime, 488 NumberOfCodeBlocks, 384 NumberOfCodeBlocksAsserted, 29 NumberOfCheckSat, 710 ConstructedInterpolants, 0 QuantifiedInterpolants, 221024 SizeOfPredicates, 9 NumberOfNonLiveVariables, 560 ConjunctsInSsa, 52 ConjunctsInUnsatCore, 17 InterpolantComputations, 4 PerfectInterpolantSequences, 14633/22417 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 correct! Received shutdown request...