./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i --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_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/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_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/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_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/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 2e1c46549da470f14361a9b2a5fb79d079bbffb4006138f4fef05b9b152f9be7 --- 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 17:21:46,898 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:21:46,901 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:21:46,959 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:21:46,960 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:21:46,965 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:21:46,968 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:21:46,976 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:21:46,978 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:21:46,979 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:21:46,981 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:21:46,982 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:21:46,983 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:21:46,984 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:21:46,986 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:21:46,988 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:21:46,991 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:21:46,999 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:21:47,001 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:21:47,008 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:21:47,010 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:21:47,012 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:21:47,013 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:21:47,014 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:21:47,019 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:21:47,020 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:21:47,020 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:21:47,021 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:21:47,022 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:21:47,023 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:21:47,024 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:21:47,025 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:21:47,026 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:21:47,026 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:21:47,028 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:21:47,028 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:21:47,029 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:21:47,029 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:21:47,029 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:21:47,030 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:21:47,031 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:21:47,032 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-10-17 17:21:47,058 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:21:47,058 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:21:47,059 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:21:47,059 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:21:47,060 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:21:47,060 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:21:47,060 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:21:47,060 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:21:47,061 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:21:47,061 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:21:47,061 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:21:47,061 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:21:47,061 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:21:47,062 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:21:47,062 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:21:47,062 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:21:47,062 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:21:47,062 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:21:47,063 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:21:47,063 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:21:47,064 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:21:47,064 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:21:47,064 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:21:47,064 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:21:47,065 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:21:47,065 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:21:47,072 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:21:47,072 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:21:47,072 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:21:47,072 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:21:47,073 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:21:47,073 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:21:47,073 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:21:47,073 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:21:47,074 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:21:47,074 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:21:47,074 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:21:47,074 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:21:47,074 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:21:47,074 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:21:47,075 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:21:47,075 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_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e1c46549da470f14361a9b2a5fb79d079bbffb4006138f4fef05b9b152f9be7 [2022-10-17 17:21:47,311 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:21:47,331 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:21:47,334 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:21:47,335 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:21:47,335 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:21:47,336 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i [2022-10-17 17:21:47,408 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/data/f6d23e955/86f3e94258f24b01a2349cd60fd446ae/FLAGaeeff2fa7 [2022-10-17 17:21:47,943 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:21:47,944 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i [2022-10-17 17:21:47,951 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/data/f6d23e955/86f3e94258f24b01a2349cd60fd446ae/FLAGaeeff2fa7 [2022-10-17 17:21:48,245 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/data/f6d23e955/86f3e94258f24b01a2349cd60fd446ae [2022-10-17 17:21:48,247 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:21:48,249 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:21:48,250 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:21:48,250 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:21:48,256 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:21:48,257 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,259 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e84f5b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48, skipping insertion in model container [2022-10-17 17:21:48,261 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,269 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:21:48,289 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:21:48,466 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_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i[812,825] [2022-10-17 17:21:48,504 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:21:48,512 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:21:48,526 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_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/sv-benchmarks/c/array-lopstr16/flag_loopdep_simple.i[812,825] [2022-10-17 17:21:48,541 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:21:48,556 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:21:48,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48 WrapperNode [2022-10-17 17:21:48,557 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:21:48,559 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:21:48,559 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:21:48,559 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:21:48,567 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,576 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,602 INFO L138 Inliner]: procedures = 17, calls = 14, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 64 [2022-10-17 17:21:48,603 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:21:48,604 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:21:48,605 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:21:48,605 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:21:48,614 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,615 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,627 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,628 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,637 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,643 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,650 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,651 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,654 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:21:48,657 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:21:48,658 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:21:48,658 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:21:48,660 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (1/1) ... [2022-10-17 17:21:48,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:21:48,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:48,698 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:21:48,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:21:48,758 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:21:48,759 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:21:48,759 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-10-17 17:21:48,759 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-10-17 17:21:48,759 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:21:48,760 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:21:48,760 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-10-17 17:21:48,760 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-10-17 17:21:48,837 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:21:48,839 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:21:48,974 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:21:49,026 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:21:49,026 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-10-17 17:21:49,028 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:21:49 BoogieIcfgContainer [2022-10-17 17:21:49,029 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:21:49,031 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:21:49,031 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:21:49,040 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:21:49,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:21:48" (1/3) ... [2022-10-17 17:21:49,041 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59cc1d5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:21:49, skipping insertion in model container [2022-10-17 17:21:49,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:21:48" (2/3) ... [2022-10-17 17:21:49,042 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@59cc1d5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:21:49, skipping insertion in model container [2022-10-17 17:21:49,042 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:21:49" (3/3) ... [2022-10-17 17:21:49,043 INFO L112 eAbstractionObserver]: Analyzing ICFG flag_loopdep_simple.i [2022-10-17 17:21:49,064 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:21:49,064 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-10-17 17:21:49,115 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:21:49,123 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;@19cbb22f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:21:49,124 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-17 17:21:49,128 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 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 17:21:49,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-10-17 17:21:49,135 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:49,135 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:49,136 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:21:49,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:49,142 INFO L85 PathProgramCache]: Analyzing trace with hash 721191376, now seen corresponding path program 1 times [2022-10-17 17:21:49,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:49,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982776869] [2022-10-17 17:21:49,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:49,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:49,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:49,362 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 17:21:49,362 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:49,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982776869] [2022-10-17 17:21:49,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982776869] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:49,364 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:21:49,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:21:49,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031826473] [2022-10-17 17:21:49,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:49,371 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:21:49,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:49,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:21:49,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:21:49,403 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 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 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 17:21:49,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:49,477 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2022-10-17 17:21:49,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:21:49,480 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 7 [2022-10-17 17:21:49,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:49,489 INFO L225 Difference]: With dead ends: 27 [2022-10-17 17:21:49,489 INFO L226 Difference]: Without dead ends: 18 [2022-10-17 17:21:49,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:21:49,497 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:49,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 10 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:21:49,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-10-17 17:21:49,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 11. [2022-10-17 17:21:49,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 states have internal predecessors, (14), 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 17:21:49,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2022-10-17 17:21:49,531 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 7 [2022-10-17 17:21:49,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:49,532 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2022-10-17 17:21:49,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 17:21:49,532 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2022-10-17 17:21:49,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-10-17 17:21:49,533 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:49,533 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:49,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:21:49,534 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:21:49,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:49,535 INFO L85 PathProgramCache]: Analyzing trace with hash 801657582, now seen corresponding path program 1 times [2022-10-17 17:21:49,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:49,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142338389] [2022-10-17 17:21:49,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:49,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:49,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:49,685 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 17:21:49,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:49,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142338389] [2022-10-17 17:21:49,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142338389] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:21:49,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142199407] [2022-10-17 17:21:49,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:49,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:49,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:49,695 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:21:49,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:21:49,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:49,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2022-10-17 17:21:49,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:21:49,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:21:49,848 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:21:49,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142199407] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:21:49,848 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-10-17 17:21:49,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2022-10-17 17:21:49,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302468939] [2022-10-17 17:21:49,850 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:21:49,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:21:49,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:49,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:21:49,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:21:49,852 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 17:21:49,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:49,879 INFO L93 Difference]: Finished difference Result 21 states and 27 transitions. [2022-10-17 17:21:49,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:21:49,881 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 8 [2022-10-17 17:21:49,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:49,882 INFO L225 Difference]: With dead ends: 21 [2022-10-17 17:21:49,883 INFO L226 Difference]: Without dead ends: 12 [2022-10-17 17:21:49,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:21:49,891 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:49,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:21:49,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-10-17 17:21:49,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-10-17 17:21:49,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 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 17:21:49,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2022-10-17 17:21:49,896 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2022-10-17 17:21:49,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:49,896 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2022-10-17 17:21:49,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 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 17:21:49,897 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2022-10-17 17:21:49,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-10-17 17:21:49,897 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:49,897 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:49,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:21:50,125 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:50,126 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:21:50,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:50,127 INFO L85 PathProgramCache]: Analyzing trace with hash -299864784, now seen corresponding path program 1 times [2022-10-17 17:21:50,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:50,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961573819] [2022-10-17 17:21:50,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:50,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:50,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:50,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:21:50,241 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:50,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961573819] [2022-10-17 17:21:50,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961573819] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:21:50,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729557765] [2022-10-17 17:21:50,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:50,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:50,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:50,244 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:21:50,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:21:50,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:50,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 5 conjunts are in the unsatisfiable core [2022-10-17 17:21:50,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:21:50,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:21:50,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:21:50,391 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-10-17 17:21:50,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729557765] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:21:50,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [188245132] [2022-10-17 17:21:50,414 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-10-17 17:21:50,414 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:21:50,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:21:50,424 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:21:50,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:21:50,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:50,551 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:21:50,553 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-10-17 17:21:50,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:50,610 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-10-17 17:21:50,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:50,678 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-10-17 17:21:50,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:50,896 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:21:50,940 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-10-17 17:21:50,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 228 treesize of output 227 [2022-10-17 17:21:51,168 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-10-17 17:21:51,386 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:21:51,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '193#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:21:51,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:21:51,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:21:51,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2022-10-17 17:21:51,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148460184] [2022-10-17 17:21:51,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:21:51,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:21:51,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:51,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:21:51,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2022-10-17 17:21:51,700 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 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 17:21:51,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:51,768 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-10-17 17:21:51,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-10-17 17:21:51,768 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 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 17:21:51,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:51,770 INFO L225 Difference]: With dead ends: 39 [2022-10-17 17:21:51,770 INFO L226 Difference]: Without dead ends: 30 [2022-10-17 17:21:51,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2022-10-17 17:21:51,779 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:51,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 25 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:21:51,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-10-17 17:21:51,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 16. [2022-10-17 17:21:51,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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 17:21:51,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-10-17 17:21:51,788 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2022-10-17 17:21:51,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:51,789 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-10-17 17:21:51,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 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 17:21:51,789 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-10-17 17:21:51,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-10-17 17:21:51,790 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:51,790 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:51,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-10-17 17:21:51,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:51,991 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:21:51,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:51,991 INFO L85 PathProgramCache]: Analyzing trace with hash 751908112, now seen corresponding path program 2 times [2022-10-17 17:21:51,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:51,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587355343] [2022-10-17 17:21:51,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:51,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:52,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:52,168 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:21:52,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:52,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587355343] [2022-10-17 17:21:52,168 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587355343] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:21:52,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531239513] [2022-10-17 17:21:52,169 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:21:52,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:52,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:52,177 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:21:52,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:21:52,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-10-17 17:21:52,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:21:52,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2022-10-17 17:21:52,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:21:52,271 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:21:52,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:21:52,304 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:21:52,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531239513] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:21:52,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [759348783] [2022-10-17 17:21:52,308 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-10-17 17:21:52,309 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:21:52,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:21:52,309 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:21:52,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:21:52,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:52,360 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:21:52,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-10-17 17:21:52,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:52,378 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-10-17 17:21:52,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:52,416 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-10-17 17:21:52,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:52,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:52,534 INFO L356 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-10-17 17:21:52,534 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 238 treesize of output 226 [2022-10-17 17:21:52,636 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-10-17 17:21:52,774 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:21:53,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '357#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:21:53,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:21:53,040 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:21:53,040 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2022-10-17 17:21:53,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513854187] [2022-10-17 17:21:53,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:21:53,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-10-17 17:21:53,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:53,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-10-17 17:21:53,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=107, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:21:53,042 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 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 17:21:53,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:53,123 INFO L93 Difference]: Finished difference Result 63 states and 76 transitions. [2022-10-17 17:21:53,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-10-17 17:21:53,124 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 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 13 [2022-10-17 17:21:53,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:53,125 INFO L225 Difference]: With dead ends: 63 [2022-10-17 17:21:53,125 INFO L226 Difference]: Without dead ends: 56 [2022-10-17 17:21:53,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=107, Unknown=0, NotChecked=0, Total=182 [2022-10-17 17:21:53,127 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 70 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:53,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 35 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:21:53,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-10-17 17:21:53,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 20. [2022-10-17 17:21:53,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 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 17:21:53,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-10-17 17:21:53,133 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2022-10-17 17:21:53,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:53,134 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-10-17 17:21:53,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 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 17:21:53,134 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-10-17 17:21:53,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 17:21:53,135 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:53,135 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:53,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-10-17 17:21:53,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:53,357 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:21:53,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:53,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1111495536, now seen corresponding path program 3 times [2022-10-17 17:21:53,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:53,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240096968] [2022-10-17 17:21:53,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:53,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:53,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:53,566 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-10-17 17:21:53,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:53,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240096968] [2022-10-17 17:21:53,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240096968] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:21:53,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831096796] [2022-10-17 17:21:53,567 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:21:53,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:53,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:53,570 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:21:53,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-10-17 17:21:53,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:21:53,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:21:53,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2022-10-17 17:21:53,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:21:53,726 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-10-17 17:21:53,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:21:53,824 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-10-17 17:21:53,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831096796] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:21:53,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [107858769] [2022-10-17 17:21:53,830 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-10-17 17:21:53,830 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:21:53,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:21:53,831 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:21:53,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:21:53,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:53,874 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:21:53,874 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-10-17 17:21:53,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:53,890 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-10-17 17:21:53,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:53,921 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-10-17 17:21:53,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:53,997 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:21:54,035 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-10-17 17:21:54,036 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 228 treesize of output 227 [2022-10-17 17:21:54,164 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-10-17 17:21:54,281 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:21:54,560 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '593#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:21:54,561 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:21:54,561 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:21:54,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6] total 19 [2022-10-17 17:21:54,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729371894] [2022-10-17 17:21:54,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:21:54,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-10-17 17:21:54,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:54,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-10-17 17:21:54,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=412, Unknown=0, NotChecked=0, Total=552 [2022-10-17 17:21:54,563 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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 17:21:54,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:54,678 INFO L93 Difference]: Finished difference Result 90 states and 109 transitions. [2022-10-17 17:21:54,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-10-17 17:21:54,679 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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) Word has length 17 [2022-10-17 17:21:54,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:54,680 INFO L225 Difference]: With dead ends: 90 [2022-10-17 17:21:54,680 INFO L226 Difference]: Without dead ends: 76 [2022-10-17 17:21:54,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=140, Invalid=412, Unknown=0, NotChecked=0, Total=552 [2022-10-17 17:21:54,682 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 161 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:54,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 55 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:21:54,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-10-17 17:21:54,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 27. [2022-10-17 17:21:54,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 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 17:21:54,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-10-17 17:21:54,690 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 17 [2022-10-17 17:21:54,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:54,690 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-10-17 17:21:54,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 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 17:21:54,691 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-10-17 17:21:54,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-10-17 17:21:54,692 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:54,692 INFO L195 NwaCegarLoop]: trace histogram [10, 7, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:54,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-10-17 17:21:54,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:54,912 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:21:54,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:54,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1942026478, now seen corresponding path program 4 times [2022-10-17 17:21:54,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:54,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1501360161] [2022-10-17 17:21:54,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:54,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:54,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:55,145 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-10-17 17:21:55,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:55,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1501360161] [2022-10-17 17:21:55,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1501360161] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:21:55,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011250367] [2022-10-17 17:21:55,146 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-10-17 17:21:55,146 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:55,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:55,147 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:21:55,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-10-17 17:21:55,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:55,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 14 conjunts are in the unsatisfiable core [2022-10-17 17:21:55,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:21:55,444 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-10-17 17:21:55,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:21:55,752 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-10-17 17:21:55,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011250367] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:21:55,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [195611048] [2022-10-17 17:21:55,755 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-10-17 17:21:55,755 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:21:55,755 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:21:55,755 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:21:55,755 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:21:55,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:55,786 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 17:21:55,787 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-10-17 17:21:55,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:55,818 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:21:55,818 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-10-17 17:21:55,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:55,851 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-10-17 17:21:55,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:55,927 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:21:55,954 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-10-17 17:21:55,954 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 228 treesize of output 227 [2022-10-17 17:21:56,076 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-10-17 17:21:56,199 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:21:56,485 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '940#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:21:56,485 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:21:56,485 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:21:56,485 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 12] total 32 [2022-10-17 17:21:56,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689554534] [2022-10-17 17:21:56,486 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:21:56,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-10-17 17:21:56,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:56,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-10-17 17:21:56,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=970, Unknown=0, NotChecked=0, Total=1332 [2022-10-17 17:21:56,488 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 32 states, 32 states have (on average 1.28125) internal successors, (41), 32 states have internal predecessors, (41), 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 17:21:56,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:56,631 INFO L93 Difference]: Finished difference Result 111 states and 137 transitions. [2022-10-17 17:21:56,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-10-17 17:21:56,632 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.28125) internal successors, (41), 32 states have internal predecessors, (41), 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 24 [2022-10-17 17:21:56,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:56,637 INFO L225 Difference]: With dead ends: 111 [2022-10-17 17:21:56,637 INFO L226 Difference]: Without dead ends: 96 [2022-10-17 17:21:56,638 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=362, Invalid=970, Unknown=0, NotChecked=0, Total=1332 [2022-10-17 17:21:56,640 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 147 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:56,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 60 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:21:56,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-10-17 17:21:56,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 40. [2022-10-17 17:21:56,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 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 17:21:56,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-10-17 17:21:56,663 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 24 [2022-10-17 17:21:56,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:56,664 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-10-17 17:21:56,664 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.28125) internal successors, (41), 32 states have internal predecessors, (41), 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 17:21:56,664 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-10-17 17:21:56,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-10-17 17:21:56,666 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:56,666 INFO L195 NwaCegarLoop]: trace histogram [22, 8, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:56,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-10-17 17:21:56,885 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:56,885 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:21:56,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:56,886 INFO L85 PathProgramCache]: Analyzing trace with hash -1369821680, now seen corresponding path program 5 times [2022-10-17 17:21:56,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:56,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507049307] [2022-10-17 17:21:56,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:56,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:56,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:57,153 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-10-17 17:21:57,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:57,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507049307] [2022-10-17 17:21:57,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507049307] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:21:57,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [289549850] [2022-10-17 17:21:57,154 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:21:57,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:57,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:57,156 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:21:57,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-10-17 17:21:57,255 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-10-17 17:21:57,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:21:57,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 10 conjunts are in the unsatisfiable core [2022-10-17 17:21:57,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:21:57,282 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-10-17 17:21:57,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:21:57,428 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-10-17 17:21:57,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [289549850] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:21:57,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1362793446] [2022-10-17 17:21:57,431 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-10-17 17:21:57,432 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:21:57,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:21:57,432 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:21:57,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:21:57,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:57,464 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 17:21:57,464 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-10-17 17:21:57,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:57,494 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:21:57,495 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-10-17 17:21:57,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:57,523 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-10-17 17:21:57,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:21:57,590 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:21:57,616 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-10-17 17:21:57,617 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 228 treesize of output 227 [2022-10-17 17:21:57,738 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-10-17 17:21:57,831 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:21:58,060 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1416#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:21:58,061 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:21:58,061 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:21:58,061 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2022-10-17 17:21:58,061 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165601239] [2022-10-17 17:21:58,061 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:21:58,062 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-10-17 17:21:58,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:21:58,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-10-17 17:21:58,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=365, Unknown=0, NotChecked=0, Total=650 [2022-10-17 17:21:58,064 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 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 17:21:58,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:21:58,234 INFO L93 Difference]: Finished difference Result 177 states and 208 transitions. [2022-10-17 17:21:58,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-10-17 17:21:58,237 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 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) Word has length 37 [2022-10-17 17:21:58,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:21:58,241 INFO L225 Difference]: With dead ends: 177 [2022-10-17 17:21:58,241 INFO L226 Difference]: Without dead ends: 170 [2022-10-17 17:21:58,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=285, Invalid=365, Unknown=0, NotChecked=0, Total=650 [2022-10-17 17:21:58,243 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 273 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:21:58,244 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 90 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:21:58,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-10-17 17:21:58,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 50. [2022-10-17 17:21:58,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 49 states have internal predecessors, (53), 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 17:21:58,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2022-10-17 17:21:58,259 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 37 [2022-10-17 17:21:58,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:21:58,260 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2022-10-17 17:21:58,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 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 17:21:58,261 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2022-10-17 17:21:58,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-10-17 17:21:58,262 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:21:58,262 INFO L195 NwaCegarLoop]: trace histogram [22, 18, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:21:58,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-10-17 17:21:58,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:58,486 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:21:58,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:21:58,486 INFO L85 PathProgramCache]: Analyzing trace with hash 190263504, now seen corresponding path program 6 times [2022-10-17 17:21:58,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:21:58,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059088072] [2022-10-17 17:21:58,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:21:58,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:21:58,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:21:59,124 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-10-17 17:21:59,125 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:21:59,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059088072] [2022-10-17 17:21:59,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059088072] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:21:59,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560237793] [2022-10-17 17:21:59,125 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:21:59,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:21:59,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:21:59,130 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:21:59,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-10-17 17:21:59,252 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:21:59,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:21:59,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 26 conjunts are in the unsatisfiable core [2022-10-17 17:21:59,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:21:59,927 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-10-17 17:21:59,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:22:00,953 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2022-10-17 17:22:00,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560237793] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:22:00,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [731342443] [2022-10-17 17:22:00,956 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-10-17 17:22:00,956 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:22:00,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:22:00,957 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:22:00,957 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:22:00,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:00,988 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 17:22:00,989 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-10-17 17:22:01,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:01,016 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:22:01,016 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-10-17 17:22:01,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:01,040 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-10-17 17:22:01,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:01,118 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:22:01,144 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-10-17 17:22:01,144 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 228 treesize of output 227 [2022-10-17 17:22:01,250 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-10-17 17:22:01,350 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:22:01,676 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2096#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:22:01,676 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:22:01,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:22:01,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 24, 24] total 67 [2022-10-17 17:22:01,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46559673] [2022-10-17 17:22:01,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:22:01,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-10-17 17:22:01,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:22:01,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-10-17 17:22:01,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1412, Invalid=3700, Unknown=0, NotChecked=0, Total=5112 [2022-10-17 17:22:01,683 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 67 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 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 17:22:01,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:22:01,952 INFO L93 Difference]: Finished difference Result 234 states and 283 transitions. [2022-10-17 17:22:01,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-10-17 17:22:01,953 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 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 47 [2022-10-17 17:22:01,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:22:01,954 INFO L225 Difference]: With dead ends: 234 [2022-10-17 17:22:01,955 INFO L226 Difference]: Without dead ends: 208 [2022-10-17 17:22:01,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1309 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1412, Invalid=3700, Unknown=0, NotChecked=0, Total=5112 [2022-10-17 17:22:01,958 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 406 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 406 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:22:01,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [406 Valid, 115 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:22:01,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-10-17 17:22:01,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 75. [2022-10-17 17:22:01,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.054054054054054) internal successors, (78), 74 states have internal predecessors, (78), 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 17:22:01,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2022-10-17 17:22:01,969 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 47 [2022-10-17 17:22:01,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:22:01,969 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2022-10-17 17:22:01,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 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 17:22:01,970 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2022-10-17 17:22:01,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-10-17 17:22:01,971 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:22:01,971 INFO L195 NwaCegarLoop]: trace histogram [46, 19, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:22:02,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-10-17 17:22:02,185 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:22:02,186 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:22:02,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:22:02,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1442170606, now seen corresponding path program 7 times [2022-10-17 17:22:02,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:22:02,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760219639] [2022-10-17 17:22:02,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:22:02,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:22:02,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:22:02,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2022-10-17 17:22:02,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:22:02,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760219639] [2022-10-17 17:22:02,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760219639] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:22:02,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31530634] [2022-10-17 17:22:02,894 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-10-17 17:22:02,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:22:02,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:22:02,895 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:22:02,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-10-17 17:22:03,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:22:03,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 50 conjunts are in the unsatisfiable core [2022-10-17 17:22:03,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:22:04,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-10-17 17:22:04,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:22:07,692 INFO L134 CoverageAnalysis]: Checked inductivity of 1271 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-10-17 17:22:07,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31530634] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:22:07,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [944433235] [2022-10-17 17:22:07,695 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-10-17 17:22:07,695 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:22:07,696 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:22:07,696 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:22:07,696 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:22:07,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:07,720 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-10-17 17:22:07,721 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-10-17 17:22:07,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:07,792 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:22:07,793 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-10-17 17:22:07,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:07,818 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-10-17 17:22:07,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:07,879 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:22:07,902 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-10-17 17:22:07,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 228 treesize of output 227 [2022-10-17 17:22:08,019 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-10-17 17:22:08,128 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:22:08,524 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3127#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:22:08,524 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:22:08,524 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:22:08,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 48, 48] total 116 [2022-10-17 17:22:08,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464427274] [2022-10-17 17:22:08,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:22:08,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2022-10-17 17:22:08,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:22:08,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2022-10-17 17:22:08,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4868, Invalid=9652, Unknown=0, NotChecked=0, Total=14520 [2022-10-17 17:22:08,536 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand has 116 states, 116 states have (on average 1.0775862068965518) internal successors, (125), 116 states have internal predecessors, (125), 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 17:22:08,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:22:08,892 INFO L93 Difference]: Finished difference Result 291 states and 365 transitions. [2022-10-17 17:22:08,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-10-17 17:22:08,893 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.0775862068965518) internal successors, (125), 116 states have internal predecessors, (125), 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 72 [2022-10-17 17:22:08,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:22:08,897 INFO L225 Difference]: With dead ends: 291 [2022-10-17 17:22:08,897 INFO L226 Difference]: Without dead ends: 264 [2022-10-17 17:22:08,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2635 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4868, Invalid=9652, Unknown=0, NotChecked=0, Total=14520 [2022-10-17 17:22:08,905 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 357 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:22:08,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [357 Valid, 140 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:22:08,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-10-17 17:22:08,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 124. [2022-10-17 17:22:08,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.032520325203252) internal successors, (127), 123 states have internal predecessors, (127), 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 17:22:08,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 127 transitions. [2022-10-17 17:22:08,927 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 127 transitions. Word has length 72 [2022-10-17 17:22:08,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:22:08,927 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 127 transitions. [2022-10-17 17:22:08,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.0775862068965518) internal successors, (125), 116 states have internal predecessors, (125), 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 17:22:08,928 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 127 transitions. [2022-10-17 17:22:08,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-10-17 17:22:08,930 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:22:08,930 INFO L195 NwaCegarLoop]: trace histogram [94, 20, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:22:08,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-10-17 17:22:09,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:22:09,134 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:22:09,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:22:09,134 INFO L85 PathProgramCache]: Analyzing trace with hash 592374672, now seen corresponding path program 8 times [2022-10-17 17:22:09,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:22:09,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330205733] [2022-10-17 17:22:09,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:22:09,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:22:09,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:22:10,293 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2022-10-17 17:22:10,293 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:22:10,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330205733] [2022-10-17 17:22:10,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330205733] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:22:10,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818169693] [2022-10-17 17:22:10,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:22:10,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:22:10,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:22:10,297 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:22:10,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-10-17 17:22:10,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-10-17 17:22:10,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:22:10,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 22 conjunts are in the unsatisfiable core [2022-10-17 17:22:10,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:22:10,896 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2022-10-17 17:22:10,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:22:11,455 INFO L134 CoverageAnalysis]: Checked inductivity of 4675 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2022-10-17 17:22:11,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818169693] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:22:11,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [202500195] [2022-10-17 17:22:11,457 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-10-17 17:22:11,457 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:22:11,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:22:11,457 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:22:11,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:22:11,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:11,482 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-10-17 17:22:11,483 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-10-17 17:22:11,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:11,495 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-10-17 17:22:11,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:11,520 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-10-17 17:22:11,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-10-17 17:22:11,567 INFO L173 IndexEqualityManager]: detected equality via solver [2022-10-17 17:22:11,590 INFO L356 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-10-17 17:22:11,591 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 228 treesize of output 227 [2022-10-17 17:22:11,705 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-10-17 17:22:11,770 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:22:11,960 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4587#(and (<= |ULTIMATE.start_init_~size#1| 1000000) (<= |ULTIMATE.start_init_~a#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~i~1#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~1#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_init_#in~a#1.offset|) (= (ite (= |ULTIMATE.start_main_#t~mem6#1| 0) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1000000 |ULTIMATE.start_init_~size#1|) (<= 0 |ULTIMATE.start_init_#in~a#1.base|) (= |ULTIMATE.start_main_~flag~0#1| 0) (= 1000000 |ULTIMATE.start_init_#in~size#1|) (<= 0 |ULTIMATE.start_init_~a#1.base|) (<= 0 |ULTIMATE.start_init_~a#1.offset|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_init_~i~0#1|) (<= |ULTIMATE.start_init_#in~a#1.offset| 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:22:11,960 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:22:11,960 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:22:11,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2022-10-17 17:22:11,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916960892] [2022-10-17 17:22:11,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:22:11,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-10-17 17:22:11,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:22:11,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-10-17 17:22:11,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1137, Invalid=1313, Unknown=0, NotChecked=0, Total=2450 [2022-10-17 17:22:11,963 INFO L87 Difference]: Start difference. First operand 124 states and 127 transitions. Second operand has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 45 states have internal predecessors, (52), 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 17:22:12,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:22:12,364 INFO L93 Difference]: Finished difference Result 441 states and 508 transitions. [2022-10-17 17:22:12,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-10-17 17:22:12,365 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 45 states have internal predecessors, (52), 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 121 [2022-10-17 17:22:12,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:22:12,368 INFO L225 Difference]: With dead ends: 441 [2022-10-17 17:22:12,368 INFO L226 Difference]: Without dead ends: 434 [2022-10-17 17:22:12,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1137, Invalid=1313, Unknown=0, NotChecked=0, Total=2450 [2022-10-17 17:22:12,371 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 966 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 966 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:22:12,371 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [966 Valid, 210 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:22:12,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2022-10-17 17:22:12,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 146. [2022-10-17 17:22:12,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.0275862068965518) internal successors, (149), 145 states have internal predecessors, (149), 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 17:22:12,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 149 transitions. [2022-10-17 17:22:12,386 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 149 transitions. Word has length 121 [2022-10-17 17:22:12,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:22:12,387 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 149 transitions. [2022-10-17 17:22:12,387 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 45 states have internal predecessors, (52), 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 17:22:12,387 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 149 transitions. [2022-10-17 17:22:12,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-10-17 17:22:12,389 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:22:12,390 INFO L195 NwaCegarLoop]: trace histogram [94, 42, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:22:12,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-10-17 17:22:12,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:22:12,613 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:22:12,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:22:12,614 INFO L85 PathProgramCache]: Analyzing trace with hash -409594672, now seen corresponding path program 9 times [2022-10-17 17:22:12,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:22:12,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212247587] [2022-10-17 17:22:12,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:22:12,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:22:12,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:22:15,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5368 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 4465 trivial. 0 not checked. [2022-10-17 17:22:15,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:22:15,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212247587] [2022-10-17 17:22:15,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212247587] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:22:15,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600300722] [2022-10-17 17:22:15,037 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:22:15,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:22:15,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:22:15,038 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:22:15,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0fd5c4a2-cbd1-4b4d-a413-61b84065d70f/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-10-17 17:22:15,312 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:22:15,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:22:15,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 1081 conjuncts, 98 conjunts are in the unsatisfiable core [2022-10-17 17:22:15,325 INFO L286 TraceCheckSpWp]: Computing forward predicates...