./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta --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 a8791b6973aa1a0d5421161a634fa2e6c3276aa5fd05ed6d81de7a2762aa206a --- 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-dbf71c6-m [2022-10-17 17:38:21,175 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:38:21,178 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:38:21,230 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:38:21,231 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:38:21,236 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:38:21,238 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:38:21,243 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:38:21,246 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:38:21,252 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:38:21,253 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:38:21,255 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:38:21,256 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:38:21,258 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:38:21,260 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:38:21,263 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:38:21,264 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:38:21,265 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:38:21,267 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:38:21,277 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:38:21,279 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:38:21,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:38:21,284 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:38:21,285 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:38:21,295 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:38:21,295 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:38:21,296 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:38:21,298 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:38:21,299 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:38:21,300 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:38:21,300 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:38:21,302 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:38:21,304 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:38:21,305 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:38:21,307 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:38:21,308 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:38:21,308 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:38:21,309 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:38:21,309 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:38:21,310 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:38:21,311 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:38:21,312 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-10-17 17:38:21,353 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:38:21,353 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:38:21,354 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:38:21,354 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:38:21,355 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:38:21,355 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:38:21,355 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:38:21,355 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:38:21,356 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:38:21,356 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:38:21,357 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:38:21,357 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:38:21,357 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:38:21,357 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:38:21,358 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:38:21,358 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:38:21,358 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:38:21,358 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:38:21,359 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:38:21,359 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:38:21,359 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:38:21,360 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:38:21,360 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:38:21,361 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:38:21,362 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:38:21,362 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:38:21,362 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:38:21,362 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:38:21,363 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:38:21,363 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:38:21,363 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:38:21,363 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:38:21,363 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:38:21,364 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:38:21,364 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:38:21,364 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:38:21,364 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:38:21,365 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:38:21,365 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:38:21,365 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:38:21,365 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:38:21,365 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_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a8791b6973aa1a0d5421161a634fa2e6c3276aa5fd05ed6d81de7a2762aa206a [2022-10-17 17:38:21,661 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:38:21,702 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:38:21,705 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:38:21,706 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:38:21,707 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:38:21,709 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c [2022-10-17 17:38:21,785 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/data/4cafcd55e/cd3b09c52558406faba9319259cb75c7/FLAG7b1db7b44 [2022-10-17 17:38:22,236 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:38:22,237 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c [2022-10-17 17:38:22,244 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/data/4cafcd55e/cd3b09c52558406faba9319259cb75c7/FLAG7b1db7b44 [2022-10-17 17:38:22,663 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/data/4cafcd55e/cd3b09c52558406faba9319259cb75c7 [2022-10-17 17:38:22,666 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:38:22,668 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:38:22,672 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:38:22,673 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:38:22,676 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:38:22,680 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:22,681 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42355b94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22, skipping insertion in model container [2022-10-17 17:38:22,682 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:22,690 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:38:22,706 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:38:22,895 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_3205bf65-2092-4f40-aee3-60847a089434/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c[468,481] [2022-10-17 17:38:22,911 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:38:22,919 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:38:22,931 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_3205bf65-2092-4f40-aee3-60847a089434/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c[468,481] [2022-10-17 17:38:22,937 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:38:22,951 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:38:22,951 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22 WrapperNode [2022-10-17 17:38:22,951 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:38:22,952 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:38:22,953 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:38:22,953 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:38:22,960 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:22,966 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:22,985 INFO L138 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 62 [2022-10-17 17:38:22,985 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:38:22,986 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:38:22,986 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:38:22,986 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:38:22,995 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:22,995 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:22,996 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:22,997 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:23,000 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:23,004 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:23,005 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:23,006 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:23,008 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:38:23,009 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:38:23,009 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:38:23,009 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:38:23,010 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (1/1) ... [2022-10-17 17:38:23,022 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:38:23,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:38:23,062 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:38:23,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:38:23,115 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:38:23,115 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:38:23,116 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:38:23,116 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:38:23,184 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:38:23,186 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:38:23,336 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:38:23,431 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:38:23,440 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-10-17 17:38:23,443 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:38:23 BoogieIcfgContainer [2022-10-17 17:38:23,443 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:38:23,445 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:38:23,445 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:38:23,450 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:38:23,450 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:38:22" (1/3) ... [2022-10-17 17:38:23,451 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d277a14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:38:23, skipping insertion in model container [2022-10-17 17:38:23,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:38:22" (2/3) ... [2022-10-17 17:38:23,452 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d277a14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:38:23, skipping insertion in model container [2022-10-17 17:38:23,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:38:23" (3/3) ... [2022-10-17 17:38:23,454 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_delay_notd2.c [2022-10-17 17:38:23,472 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:38:23,472 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-10-17 17:38:23,520 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:38:23,528 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;@46d1d8fb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:38:23,528 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-17 17:38:23,532 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:23,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-10-17 17:38:23,539 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:23,540 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-10-17 17:38:23,540 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:23,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:23,546 INFO L85 PathProgramCache]: Analyzing trace with hash 110532394, now seen corresponding path program 1 times [2022-10-17 17:38:23,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:23,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669601639] [2022-10-17 17:38:23,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:23,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:23,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:23,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:23,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:38:23,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669601639] [2022-10-17 17:38:23,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669601639] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:38:23,923 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:38:23,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:38:23,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974557119] [2022-10-17 17:38:23,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:38:23,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-10-17 17:38:23,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:38:24,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-10-17 17:38:24,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:38:24,019 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:24,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:38:24,102 INFO L93 Difference]: Finished difference Result 16 states and 23 transitions. [2022-10-17 17:38:24,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-10-17 17:38:24,105 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-10-17 17:38:24,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:38:24,112 INFO L225 Difference]: With dead ends: 16 [2022-10-17 17:38:24,112 INFO L226 Difference]: Without dead ends: 9 [2022-10-17 17:38:24,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:38:24,119 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 8 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:38:24,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 9 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:38:24,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-10-17 17:38:24,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 8. [2022-10-17 17:38:24,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:24,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2022-10-17 17:38:24,153 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2022-10-17 17:38:24,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:38:24,154 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2022-10-17 17:38:24,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:24,155 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2022-10-17 17:38:24,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-10-17 17:38:24,156 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:24,156 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-10-17 17:38:24,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:38:24,157 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:24,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:24,160 INFO L85 PathProgramCache]: Analyzing trace with hash -868517856, now seen corresponding path program 1 times [2022-10-17 17:38:24,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:24,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625393754] [2022-10-17 17:38:24,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:24,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:24,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:24,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:24,349 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:38:24,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625393754] [2022-10-17 17:38:24,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625393754] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:38:24,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231234611] [2022-10-17 17:38:24,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:24,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:24,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:38:24,352 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:38:24,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:38:24,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:24,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2022-10-17 17:38:24,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:38:24,512 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:24,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:38:24,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:24,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231234611] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:38:24,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1580057887] [2022-10-17 17:38:24,622 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-10-17 17:38:24,622 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:38:24,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:38:24,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:38:24,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:38:25,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:38:26,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (<= ~SIZE~0 ~last~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= ~SIZE~0 ~last~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))))) (= 2 |ULTIMATE.start_main_~b~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= ~SIZE~0 20) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 20 ~SIZE~0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-10-17 17:38:26,681 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:38:26,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:38:26,682 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2022-10-17 17:38:26,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680593157] [2022-10-17 17:38:26,683 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:38:26,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-10-17 17:38:26,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:38:26,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-10-17 17:38:26,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:38:26,685 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:26,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:38:26,748 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2022-10-17 17:38:26,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 17:38:26,748 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-10-17 17:38:26,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:38:26,749 INFO L225 Difference]: With dead ends: 19 [2022-10-17 17:38:26,749 INFO L226 Difference]: Without dead ends: 12 [2022-10-17 17:38:26,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=83, Invalid=157, Unknown=0, NotChecked=0, Total=240 [2022-10-17 17:38:26,752 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:38:26,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 13 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:38:26,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-10-17 17:38:26,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2022-10-17 17:38:26,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:26,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-10-17 17:38:26,757 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2022-10-17 17:38:26,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:38:26,757 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-10-17 17:38:26,757 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:26,757 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-10-17 17:38:26,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-10-17 17:38:26,758 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:26,758 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1] [2022-10-17 17:38:26,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:38:26,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:26,985 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:26,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:26,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1186847574, now seen corresponding path program 2 times [2022-10-17 17:38:26,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:26,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193743985] [2022-10-17 17:38:26,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:26,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:27,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:27,164 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:27,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:38:27,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193743985] [2022-10-17 17:38:27,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193743985] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:38:27,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562269934] [2022-10-17 17:38:27,165 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:38:27,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:27,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:38:27,168 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:38:27,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:38:27,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-10-17 17:38:27,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:38:27,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2022-10-17 17:38:27,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:38:27,346 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:27,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:38:27,431 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:27,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562269934] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:38:27,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1955701967] [2022-10-17 17:38:27,442 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-10-17 17:38:27,443 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:38:27,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:38:27,443 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:38:27,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:38:27,747 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:38:28,317 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '215#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (<= ~SIZE~0 ~last~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= ~SIZE~0 ~last~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))))) (= 2 |ULTIMATE.start_main_~b~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= ~SIZE~0 20) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~st~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-10-17 17:38:28,317 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:38:28,317 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:38:28,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2022-10-17 17:38:28,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838202685] [2022-10-17 17:38:28,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:38:28,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-10-17 17:38:28,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:38:28,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-10-17 17:38:28,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=326, Unknown=0, NotChecked=0, Total=506 [2022-10-17 17:38:28,320 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:28,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:38:28,440 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2022-10-17 17:38:28,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-10-17 17:38:28,445 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-10-17 17:38:28,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:38:28,445 INFO L225 Difference]: With dead ends: 28 [2022-10-17 17:38:28,445 INFO L226 Difference]: Without dead ends: 18 [2022-10-17 17:38:28,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=260, Invalid=496, Unknown=0, NotChecked=0, Total=756 [2022-10-17 17:38:28,447 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:38:28,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 17 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:38:28,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-10-17 17:38:28,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-10-17 17:38:28,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:28,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-10-17 17:38:28,453 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 9 [2022-10-17 17:38:28,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:38:28,454 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-10-17 17:38:28,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:28,454 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-10-17 17:38:28,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-10-17 17:38:28,455 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:28,455 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1] [2022-10-17 17:38:28,491 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-10-17 17:38:28,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:28,669 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:28,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:28,669 INFO L85 PathProgramCache]: Analyzing trace with hash 2036093162, now seen corresponding path program 3 times [2022-10-17 17:38:28,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:28,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016439632] [2022-10-17 17:38:28,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:28,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:28,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:29,004 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:29,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:38:29,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016439632] [2022-10-17 17:38:29,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016439632] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:38:29,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609154447] [2022-10-17 17:38:29,005 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:38:29,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:29,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:38:29,024 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:38:29,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:38:29,121 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:38:29,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:38:29,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2022-10-17 17:38:29,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:38:29,316 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:29,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:38:29,520 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:29,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609154447] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:38:29,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503435363] [2022-10-17 17:38:29,522 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-10-17 17:38:29,522 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:38:29,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:38:29,522 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:38:29,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:38:29,999 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:38:30,805 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '427#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (<= ~SIZE~0 ~last~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= ~SIZE~0 ~last~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))))) (= 2 |ULTIMATE.start_main_~b~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= ~SIZE~0 20) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 20 ~SIZE~0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-10-17 17:38:30,805 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:38:30,805 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:38:30,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 34 [2022-10-17 17:38:30,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156790604] [2022-10-17 17:38:30,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:38:30,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-10-17 17:38:30,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:38:30,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-10-17 17:38:30,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=921, Unknown=0, NotChecked=0, Total=1482 [2022-10-17 17:38:30,809 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:31,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:38:31,081 INFO L93 Difference]: Finished difference Result 44 states and 56 transitions. [2022-10-17 17:38:31,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-10-17 17:38:31,082 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-10-17 17:38:31,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:38:31,083 INFO L225 Difference]: With dead ends: 44 [2022-10-17 17:38:31,083 INFO L226 Difference]: Without dead ends: 28 [2022-10-17 17:38:31,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 937 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=795, Invalid=1461, Unknown=0, NotChecked=0, Total=2256 [2022-10-17 17:38:31,085 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:38:31,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 17 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:38:31,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-10-17 17:38:31,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2022-10-17 17:38:31,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:31,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-10-17 17:38:31,092 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 15 [2022-10-17 17:38:31,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:38:31,093 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-10-17 17:38:31,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:31,093 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-10-17 17:38:31,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-10-17 17:38:31,094 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:31,094 INFO L195 NwaCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1] [2022-10-17 17:38:31,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-10-17 17:38:31,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:31,301 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:31,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:31,301 INFO L85 PathProgramCache]: Analyzing trace with hash -359343446, now seen corresponding path program 4 times [2022-10-17 17:38:31,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:31,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819233599] [2022-10-17 17:38:31,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:31,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:31,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:33,580 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:33,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:38:33,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819233599] [2022-10-17 17:38:33,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819233599] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:38:33,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121030365] [2022-10-17 17:38:33,581 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-10-17 17:38:33,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:33,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:38:33,583 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:38:33,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-10-17 17:38:33,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:33,641 WARN L261 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 76 conjunts are in the unsatisfiable core [2022-10-17 17:38:33,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:38:35,835 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:35,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:38:40,962 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:38:40,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121030365] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:38:40,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967364347] [2022-10-17 17:38:40,964 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-10-17 17:38:40,965 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:38:40,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:38:40,965 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:38:40,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:38:41,431 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:38:42,376 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '794#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)) (= |#NULL.base| 0)) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= 2 |ULTIMATE.start_main_~b~0#1|) (= |#NULL.base| 0)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (<= ~SIZE~0 ~last~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= ~SIZE~0 ~last~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= 2 |ULTIMATE.start_main_~b~0#1|) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))) (= |#NULL.base| 0))) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= ~SIZE~0 20) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 20 ~SIZE~0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2022-10-17 17:38:42,376 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:38:42,376 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:38:42,376 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 69 [2022-10-17 17:38:42,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973175330] [2022-10-17 17:38:42,376 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:38:42,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-10-17 17:38:42,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:38:42,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-10-17 17:38:42,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1544, Invalid=3858, Unknown=0, NotChecked=0, Total=5402 [2022-10-17 17:38:42,381 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:45,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:38:45,165 INFO L93 Difference]: Finished difference Result 101 states and 108 transitions. [2022-10-17 17:38:45,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-10-17 17:38:45,174 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-10-17 17:38:45,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:38:45,176 INFO L225 Difference]: With dead ends: 101 [2022-10-17 17:38:45,176 INFO L226 Difference]: Without dead ends: 99 [2022-10-17 17:38:45,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3979 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=2222, Invalid=7480, Unknown=0, NotChecked=0, Total=9702 [2022-10-17 17:38:45,180 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 27 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-10-17 17:38:45,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 41 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-10-17 17:38:45,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-10-17 17:38:45,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 74. [2022-10-17 17:38:45,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0547945205479452) internal successors, (77), 73 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:45,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2022-10-17 17:38:45,221 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 25 [2022-10-17 17:38:45,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:38:45,222 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2022-10-17 17:38:45,222 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:45,222 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2022-10-17 17:38:45,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-10-17 17:38:45,224 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:45,224 INFO L195 NwaCegarLoop]: trace histogram [41, 2, 2, 1, 1, 1, 1, 1] [2022-10-17 17:38:45,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-10-17 17:38:45,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:45,449 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:45,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:45,449 INFO L85 PathProgramCache]: Analyzing trace with hash 1689444428, now seen corresponding path program 1 times [2022-10-17 17:38:45,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:45,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572831309] [2022-10-17 17:38:45,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:45,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:45,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:46,068 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 254 proven. 440 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2022-10-17 17:38:46,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:38:46,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572831309] [2022-10-17 17:38:46,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [572831309] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:38:46,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125755583] [2022-10-17 17:38:46,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:46,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:46,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:38:46,076 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:38:46,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-10-17 17:38:46,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:38:46,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 23 conjunts are in the unsatisfiable core [2022-10-17 17:38:46,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:38:46,831 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 694 proven. 0 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2022-10-17 17:38:46,832 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:38:46,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125755583] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:38:46,832 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-10-17 17:38:46,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [23] total 44 [2022-10-17 17:38:46,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139527626] [2022-10-17 17:38:46,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:38:46,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-10-17 17:38:46,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:38:46,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-10-17 17:38:46,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=1260, Unknown=0, NotChecked=0, Total=1980 [2022-10-17 17:38:46,835 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:46,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:38:46,930 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2022-10-17 17:38:46,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-10-17 17:38:46,931 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-10-17 17:38:46,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:38:46,934 INFO L225 Difference]: With dead ends: 126 [2022-10-17 17:38:46,935 INFO L226 Difference]: Without dead ends: 74 [2022-10-17 17:38:46,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=720, Invalid=1260, Unknown=0, NotChecked=0, Total=1980 [2022-10-17 17:38:46,939 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 20 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:38:46,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 6 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:38:46,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-10-17 17:38:46,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2022-10-17 17:38:46,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0136986301369864) internal successors, (74), 73 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:46,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2022-10-17 17:38:46,976 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 50 [2022-10-17 17:38:46,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:38:46,977 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2022-10-17 17:38:46,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:38:46,977 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2022-10-17 17:38:46,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-10-17 17:38:46,982 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:38:46,982 INFO L195 NwaCegarLoop]: trace histogram [60, 3, 3, 2, 2, 1, 1, 1] [2022-10-17 17:38:47,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-10-17 17:38:47,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3205bf65-2092-4f40-aee3-60847a089434/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:38:47,205 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:38:47,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:38:47,205 INFO L85 PathProgramCache]: Analyzing trace with hash -1335370670, now seen corresponding path program 2 times [2022-10-17 17:38:47,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:38:47,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944146240] [2022-10-17 17:38:47,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:38:47,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:38:47,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat