./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_o3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_o3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI --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 862de3da7324bf897583f86d3cb756f668fc7c871c8791ecf46f087893ee7b09 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-03 01:55:47,736 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 01:55:47,739 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 01:55:47,792 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 01:55:47,793 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 01:55:47,797 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 01:55:47,799 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 01:55:47,801 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 01:55:47,802 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 01:55:47,803 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 01:55:47,805 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 01:55:47,806 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 01:55:47,807 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 01:55:47,808 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 01:55:47,809 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 01:55:47,810 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 01:55:47,811 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 01:55:47,813 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 01:55:47,814 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 01:55:47,816 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 01:55:47,818 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 01:55:47,824 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 01:55:47,825 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 01:55:47,826 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 01:55:47,830 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 01:55:47,839 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 01:55:47,839 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 01:55:47,840 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 01:55:47,841 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 01:55:47,842 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 01:55:47,843 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 01:55:47,844 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 01:55:47,846 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 01:55:47,848 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 01:55:47,850 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 01:55:47,850 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 01:55:47,852 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 01:55:47,852 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 01:55:47,853 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 01:55:47,854 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 01:55:47,855 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 01:55:47,856 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 01:55:47,898 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 01:55:47,898 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 01:55:47,899 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 01:55:47,899 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 01:55:47,900 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 01:55:47,900 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 01:55:47,900 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 01:55:47,900 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 01:55:47,901 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 01:55:47,901 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 01:55:47,901 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 01:55:47,901 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 01:55:47,902 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 01:55:47,902 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 01:55:47,902 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 01:55:47,902 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 01:55:47,903 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 01:55:47,903 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 01:55:47,904 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 01:55:47,904 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 01:55:47,904 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 01:55:47,904 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 01:55:47,905 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 01:55:47,905 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 01:55:47,905 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 01:55:47,905 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 01:55:47,906 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 01:55:47,906 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 01:55:47,906 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 01:55:47,906 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 01:55:47,907 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 01:55:47,907 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 01:55:47,907 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 01:55:47,907 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 01:55:47,908 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 01:55:47,908 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 01:55:47,908 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 01:55:47,908 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 01:55:47,909 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 01:55:47,909 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 01:55:47,909 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 01:55:47,909 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 862de3da7324bf897583f86d3cb756f668fc7c871c8791ecf46f087893ee7b09 [2022-11-03 01:55:48,217 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 01:55:48,251 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 01:55:48,267 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 01:55:48,268 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 01:55:48,270 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 01:55:48,271 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/recursive-simple/id_o3.c [2022-11-03 01:55:48,353 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/data/88a99c832/754db1da89064c7d975e1fdbd9ad0920/FLAG2b9fa2ca3 [2022-11-03 01:55:48,840 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 01:55:48,841 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/sv-benchmarks/c/recursive-simple/id_o3.c [2022-11-03 01:55:48,856 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/data/88a99c832/754db1da89064c7d975e1fdbd9ad0920/FLAG2b9fa2ca3 [2022-11-03 01:55:49,234 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/data/88a99c832/754db1da89064c7d975e1fdbd9ad0920 [2022-11-03 01:55:49,237 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 01:55:49,239 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 01:55:49,240 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 01:55:49,240 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 01:55:49,244 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 01:55:49,245 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,246 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4af947b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49, skipping insertion in model container [2022-11-03 01:55:49,247 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,254 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 01:55:49,267 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 01:55:49,468 WARN L230 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_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/sv-benchmarks/c/recursive-simple/id_o3.c[514,527] [2022-11-03 01:55:49,471 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 01:55:49,481 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 01:55:49,496 WARN L230 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_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/sv-benchmarks/c/recursive-simple/id_o3.c[514,527] [2022-11-03 01:55:49,496 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 01:55:49,510 INFO L208 MainTranslator]: Completed translation [2022-11-03 01:55:49,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49 WrapperNode [2022-11-03 01:55:49,511 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 01:55:49,512 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 01:55:49,512 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 01:55:49,512 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 01:55:49,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,527 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,546 INFO L138 Inliner]: procedures = 13, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 19 [2022-11-03 01:55:49,547 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 01:55:49,548 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 01:55:49,548 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 01:55:49,548 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 01:55:49,556 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,557 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,558 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,558 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,560 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,562 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,563 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,563 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,572 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 01:55:49,574 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 01:55:49,574 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 01:55:49,574 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 01:55:49,576 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (1/1) ... [2022-11-03 01:55:49,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 01:55:49,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:49,611 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 01:55:49,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 01:55:49,660 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 01:55:49,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 01:55:49,661 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 01:55:49,661 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 01:55:49,661 INFO L130 BoogieDeclarations]: Found specification of procedure id [2022-11-03 01:55:49,661 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2022-11-03 01:55:49,730 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 01:55:49,733 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 01:55:49,906 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 01:55:49,937 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 01:55:49,937 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-03 01:55:49,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:55:49 BoogieIcfgContainer [2022-11-03 01:55:49,940 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 01:55:49,943 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 01:55:49,943 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 01:55:49,951 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 01:55:49,952 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 01:55:49" (1/3) ... [2022-11-03 01:55:49,952 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e926f66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 01:55:49, skipping insertion in model container [2022-11-03 01:55:49,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:55:49" (2/3) ... [2022-11-03 01:55:49,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e926f66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 01:55:49, skipping insertion in model container [2022-11-03 01:55:49,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:55:49" (3/3) ... [2022-11-03 01:55:49,954 INFO L112 eAbstractionObserver]: Analyzing ICFG id_o3.c [2022-11-03 01:55:49,975 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 01:55:49,976 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 01:55:50,032 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 01:55:50,040 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5e6aaaa8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 01:55:50,040 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 01:55:50,045 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 01:55:50,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 01:55:50,055 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:50,056 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:50,056 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:50,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:50,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2022-11-03 01:55:50,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:50,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742632603] [2022-11-03 01:55:50,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:50,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:50,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:50,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:55:50,416 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:50,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742632603] [2022-11-03 01:55:50,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742632603] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:55:50,417 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:55:50,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 01:55:50,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165212373] [2022-11-03 01:55:50,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:55:50,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 01:55:50,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:50,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 01:55:50,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 01:55:50,476 INFO L87 Difference]: Start difference. First operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 01:55:50,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:50,595 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2022-11-03 01:55:50,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 01:55:50,608 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-11-03 01:55:50,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:50,617 INFO L225 Difference]: With dead ends: 24 [2022-11-03 01:55:50,617 INFO L226 Difference]: Without dead ends: 14 [2022-11-03 01:55:50,620 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 01:55:50,631 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 2 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:50,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 39 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:50,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-11-03 01:55:50,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-11-03 01:55:50,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 10 states have internal predecessors, (10), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 01:55:50,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-03 01:55:50,688 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2022-11-03 01:55:50,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:50,688 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-03 01:55:50,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 01:55:50,690 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-03 01:55:50,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 01:55:50,691 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:50,692 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:50,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 01:55:50,693 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:50,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:50,694 INFO L85 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2022-11-03 01:55:50,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:50,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208945217] [2022-11-03 01:55:50,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:50,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:50,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:50,913 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 01:55:50,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:55:50,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208945217] [2022-11-03 01:55:50,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208945217] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:55:50,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616473239] [2022-11-03 01:55:50,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:50,915 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:50,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:55:50,920 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:55:50,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 01:55:50,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:55:50,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 01:55:51,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:55:51,187 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 01:55:51,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:55:51,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 01:55:51,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616473239] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:55:51,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1756088385] [2022-11-03 01:55:51,392 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 01:55:51,392 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:55:51,402 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-03 01:55:51,408 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:55:51,409 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2022-11-03 01:55:51,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631644952] [2022-11-03 01:55:51,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:55:51,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 01:55:51,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:55:51,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 01:55:51,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-11-03 01:55:51,415 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 01:55:51,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:55:51,502 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-11-03 01:55:51,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 01:55:51,504 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) Word has length 15 [2022-11-03 01:55:51,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:55:51,505 INFO L225 Difference]: With dead ends: 26 [2022-11-03 01:55:51,506 INFO L226 Difference]: Without dead ends: 20 [2022-11-03 01:55:51,506 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-11-03 01:55:51,507 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:55:51,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 93 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:55:51,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-03 01:55:51,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-03 01:55:51,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 14 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 01:55:51,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-03 01:55:51,513 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2022-11-03 01:55:51,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:55:51,514 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-03 01:55:51,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 9 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (4), 4 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-03 01:55:51,514 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-03 01:55:51,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-03 01:55:51,518 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:55:51,518 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 01:55:51,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 01:55:51,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:55:51,735 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:55:51,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:55:51,736 INFO L85 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 2 times [2022-11-03 01:55:51,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:55:51,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485949452] [2022-11-03 01:55:51,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:55:51,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:55:51,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-03 01:55:51,761 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-11-03 01:55:51,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-03 01:55:51,792 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2022-11-03 01:55:51,793 INFO L359 BasicCegarLoop]: Counterexample is feasible [2022-11-03 01:55:51,794 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-03 01:55:51,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-03 01:55:51,799 INFO L444 BasicCegarLoop]: Path program histogram: [2, 1] [2022-11-03 01:55:51,803 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-03 01:55:51,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.11 01:55:51 BoogieIcfgContainer [2022-11-03 01:55:51,828 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-03 01:55:51,828 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-03 01:55:51,828 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-03 01:55:51,829 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-03 01:55:51,829 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:55:49" (3/4) ... [2022-11-03 01:55:51,831 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-11-03 01:55:51,866 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/witness.graphml [2022-11-03 01:55:51,867 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-03 01:55:51,867 INFO L158 Benchmark]: Toolchain (without parser) took 2628.94ms. Allocated memory was 96.5MB in the beginning and 123.7MB in the end (delta: 27.3MB). Free memory was 60.5MB in the beginning and 57.8MB in the end (delta: 2.7MB). Peak memory consumption was 31.0MB. Max. memory is 16.1GB. [2022-11-03 01:55:51,868 INFO L158 Benchmark]: CDTParser took 0.34ms. Allocated memory is still 96.5MB. Free memory is still 76.9MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 01:55:51,868 INFO L158 Benchmark]: CACSL2BoogieTranslator took 271.13ms. Allocated memory is still 96.5MB. Free memory was 60.3MB in the beginning and 72.3MB in the end (delta: -12.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-11-03 01:55:51,869 INFO L158 Benchmark]: Boogie Procedure Inliner took 35.29ms. Allocated memory is still 96.5MB. Free memory was 72.3MB in the beginning and 70.9MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-03 01:55:51,869 INFO L158 Benchmark]: Boogie Preprocessor took 24.70ms. Allocated memory is still 96.5MB. Free memory was 70.9MB in the beginning and 70.0MB in the end (delta: 959.7kB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 01:55:51,869 INFO L158 Benchmark]: RCFGBuilder took 366.42ms. Allocated memory is still 96.5MB. Free memory was 70.0MB in the beginning and 60.4MB in the end (delta: 9.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-11-03 01:55:51,870 INFO L158 Benchmark]: TraceAbstraction took 1885.10ms. Allocated memory was 96.5MB in the beginning and 123.7MB in the end (delta: 27.3MB). Free memory was 59.8MB in the beginning and 59.9MB in the end (delta: -107.1kB). Peak memory consumption was 29.7MB. Max. memory is 16.1GB. [2022-11-03 01:55:51,870 INFO L158 Benchmark]: Witness Printer took 38.64ms. Allocated memory is still 123.7MB. Free memory was 59.9MB in the beginning and 57.8MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-03 01:55:51,872 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34ms. Allocated memory is still 96.5MB. Free memory is still 76.9MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 271.13ms. Allocated memory is still 96.5MB. Free memory was 60.3MB in the beginning and 72.3MB in the end (delta: -12.0MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 35.29ms. Allocated memory is still 96.5MB. Free memory was 72.3MB in the beginning and 70.9MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 24.70ms. Allocated memory is still 96.5MB. Free memory was 70.9MB in the beginning and 70.0MB in the end (delta: 959.7kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 366.42ms. Allocated memory is still 96.5MB. Free memory was 70.0MB in the beginning and 60.4MB in the end (delta: 9.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 1885.10ms. Allocated memory was 96.5MB in the beginning and 123.7MB in the end (delta: 27.3MB). Free memory was 59.8MB in the beginning and 59.9MB in the end (delta: -107.1kB). Peak memory consumption was 29.7MB. Max. memory is 16.1GB. * Witness Printer took 38.64ms. Allocated memory is still 123.7MB. Free memory was 59.9MB in the beginning and 57.8MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] unsigned int input = __VERIFIER_nondet_uint(); [L13] CALL, EXPR id(input) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) VAL [id(input)=3, input=3] [L13] unsigned int result = id(input); [L14] COND TRUE result == 3 VAL [input=3, result=3] [L15] reach_error() VAL [input=3, result=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1.8s, OverallIterations: 3, TraceHistogramMax: 4, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 2 SdHoareTripleChecker+Valid, 0.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 2 mSDsluCounter, 132 SdHoareTripleChecker+Invalid, 0.1s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 117 mSDsCounter, 2 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 60 IncrementalHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2 mSolverCounterUnsat, 23 mSDtfsCounter, 60 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=20occurred in iteration=2, InterpolantAutomatonStates: 16, 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, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 66 NumberOfCodeBlocks, 66 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 50 ConstructedInterpolants, 0 QuantifiedInterpolants, 164 SizeOfPredicates, 1 NumberOfNonLiveVariables, 55 ConjunctsInSsa, 12 ConjunctsInUnsatCore, 4 InterpolantComputations, 1 PerfectInterpolantSequences, 6/12 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2022-11-03 01:55:51,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a9a97b86-7fbf-49e6-bcfe-fa581c85aacc/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE