./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --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 6060f0df556deb332d160eff8a39bcf699b67887fb6a475da5cd3837f5257af8 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:02:52,672 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:02:52,744 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:02:52,750 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:02:52,751 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:02:52,775 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:02:52,776 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:02:52,776 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:02:52,777 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:02:52,778 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:02:52,778 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:02:52,779 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:02:52,780 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:02:52,780 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:02:52,781 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:02:52,781 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:02:52,782 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:02:52,783 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:02:52,783 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:02:52,784 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:02:52,784 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:02:52,785 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:02:52,786 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:02:52,787 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:02:52,788 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:02:52,788 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:02:52,789 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:02:52,789 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:02:52,790 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:02:52,790 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:02:52,791 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:02:52,791 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:02:52,792 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:02:52,792 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:02:52,793 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:02:52,793 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:02:52,794 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:02:52,794 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:02:52,794 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:02:52,795 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:02:52,795 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:02:52,796 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:02:52,796 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:02:52,796 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:02:52,796 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:02:52,797 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6060f0df556deb332d160eff8a39bcf699b67887fb6a475da5cd3837f5257af8 [2023-11-19 05:02:53,041 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:02:53,099 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:02:53,103 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:02:53,104 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:02:53,105 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:02:53,108 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c [2023-11-19 05:02:56,286 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:02:56,540 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:02:56,540 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c [2023-11-19 05:02:56,549 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/data/2ec778f56/13836b8e632f4f71af0935e8d6e9593b/FLAGf940cc3bd [2023-11-19 05:02:56,565 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/data/2ec778f56/13836b8e632f4f71af0935e8d6e9593b [2023-11-19 05:02:56,568 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:02:56,570 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:02:56,572 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:02:56,572 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:02:56,586 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:02:56,587 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:56,588 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57378fda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56, skipping insertion in model container [2023-11-19 05:02:56,589 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:56,619 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:02:56,852 WARN L240 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_070c1973-5771-4b06-a9d9-76b5d1ff82cc/sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c[991,1004] [2023-11-19 05:02:56,860 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:02:56,872 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:02:56,901 WARN L240 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_070c1973-5771-4b06-a9d9-76b5d1ff82cc/sv-benchmarks/c/array-examples/standard_sentinel.i.v+cfa-reducer.c[991,1004] [2023-11-19 05:02:56,904 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:02:56,921 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:02:56,921 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56 WrapperNode [2023-11-19 05:02:56,921 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:02:56,923 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:02:56,924 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:02:56,924 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:02:56,932 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:56,940 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:56,967 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 73 [2023-11-19 05:02:56,968 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:02:56,969 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:02:56,969 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:02:56,969 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:02:56,979 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:56,980 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:56,992 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:56,994 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:56,998 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:57,008 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:57,015 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:57,017 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:57,019 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:02:57,020 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:02:57,020 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:02:57,021 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:02:57,022 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (1/1) ... [2023-11-19 05:02:57,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:02:57,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:02:57,058 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:02:57,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:02:57,098 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:02:57,098 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:02:57,098 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:02:57,098 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:02:57,099 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:02:57,100 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:02:57,100 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:02:57,100 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:02:57,179 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:02:57,182 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:02:57,330 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:02:57,361 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:02:57,365 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-19 05:02:57,369 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:02:57 BoogieIcfgContainer [2023-11-19 05:02:57,369 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:02:57,373 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:02:57,373 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:02:57,377 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:02:57,378 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:02:56" (1/3) ... [2023-11-19 05:02:57,379 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3094d299 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:02:57, skipping insertion in model container [2023-11-19 05:02:57,379 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:02:56" (2/3) ... [2023-11-19 05:02:57,380 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3094d299 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:02:57, skipping insertion in model container [2023-11-19 05:02:57,380 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:02:57" (3/3) ... [2023-11-19 05:02:57,381 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_sentinel.i.v+cfa-reducer.c [2023-11-19 05:02:57,404 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:02:57,404 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:02:57,524 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:02:57,533 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=LoopHeads, 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;@1dbbfd69, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:02:57,537 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:02:57,542 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) [2023-11-19 05:02:57,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 05:02:57,550 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:02:57,551 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:02:57,553 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:02:57,560 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:02:57,561 INFO L85 PathProgramCache]: Analyzing trace with hash -474881779, now seen corresponding path program 1 times [2023-11-19 05:02:57,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:02:57,574 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359184090] [2023-11-19 05:02:57,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:02:57,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:02:57,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:02:57,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:02:57,902 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:02:57,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359184090] [2023-11-19 05:02:57,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359184090] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:02:57,903 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:02:57,903 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:02:57,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948668902] [2023-11-19 05:02:57,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:02:57,913 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:02:57,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:02:57,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:02:57,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:02:57,960 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 2.6666666666666665) 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) [2023-11-19 05:02:58,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:02:58,022 INFO L93 Difference]: Finished difference Result 21 states and 29 transitions. [2023-11-19 05:02:58,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:02:58,025 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 [2023-11-19 05:02:58,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:02:58,033 INFO L225 Difference]: With dead ends: 21 [2023-11-19 05:02:58,033 INFO L226 Difference]: Without dead ends: 10 [2023-11-19 05:02:58,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:02:58,040 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:02:58,041 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:02:58,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-11-19 05:02:58,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-11-19 05:02:58,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 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) [2023-11-19 05:02:58,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2023-11-19 05:02:58,079 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2023-11-19 05:02:58,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:02:58,080 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2023-11-19 05:02:58,080 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) [2023-11-19 05:02:58,080 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2023-11-19 05:02:58,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:02:58,081 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:02:58,081 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:02:58,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:02:58,081 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:02:58,082 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:02:58,082 INFO L85 PathProgramCache]: Analyzing trace with hash -337823367, now seen corresponding path program 1 times [2023-11-19 05:02:58,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:02:58,083 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126731827] [2023-11-19 05:02:58,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:02:58,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:02:58,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:02:58,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:02:58,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:02:58,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126731827] [2023-11-19 05:02:58,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126731827] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:02:58,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790981868] [2023-11-19 05:02:58,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:02:58,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:02:58,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:02:58,263 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:02:58,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:02:58,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:02:58,348 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:02:58,353 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:02:58,415 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:02:58,415 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:02:58,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:02:58,446 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790981868] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:02:58,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [703467285] [2023-11-19 05:02:58,470 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:02:58,470 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:02:58,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:02:58,480 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:02:58,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:02:59,101 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:02:59,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [703467285] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:02:59,388 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:02:59,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 12 [2023-11-19 05:02:59,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464752673] [2023-11-19 05:02:59,391 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:02:59,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:02:59,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:02:59,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:02:59,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:02:59,396 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:02:59,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:02:59,510 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2023-11-19 05:02:59,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:02:59,511 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 05:02:59,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:02:59,512 INFO L225 Difference]: With dead ends: 15 [2023-11-19 05:02:59,512 INFO L226 Difference]: Without dead ends: 12 [2023-11-19 05:02:59,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:02:59,516 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 12 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:02:59,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 9 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:02:59,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-19 05:02:59,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-19 05:02:59,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:02:59,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2023-11-19 05:02:59,528 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2023-11-19 05:02:59,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:02:59,529 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2023-11-19 05:02:59,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:02:59,529 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2023-11-19 05:02:59,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 05:02:59,530 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:02:59,530 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:02:59,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:02:59,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-19 05:02:59,748 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:02:59,749 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:02:59,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1767170620, now seen corresponding path program 1 times [2023-11-19 05:02:59,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:02:59,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768071838] [2023-11-19 05:02:59,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:02:59,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:02:59,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:02:59,880 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:02:59,881 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:02:59,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768071838] [2023-11-19 05:02:59,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768071838] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:02:59,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930065069] [2023-11-19 05:02:59,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:02:59,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:02:59,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:02:59,884 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:02:59,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:02:59,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:02:59,952 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:02:59,954 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:02:59,967 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:02:59,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:02:59,988 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:02:59,989 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930065069] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:02:59,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1244701020] [2023-11-19 05:02:59,994 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:02:59,994 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:02:59,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:02:59,995 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:02:59,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:03:00,575 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:03:00,935 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '211#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~main__pos~0#1| 99999) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~main__marker~0#1| 2147483647) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (<= 0 |ULTIMATE.start_main_~main__pos~0#1|) (<= (+ |ULTIMATE.start_main_~main__pos~0#1| 1) |ULTIMATE.start_main_~main__i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~main__marker~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#main__a~0#1.base|) (= ~__return_60~0 0) (= ~__return_main~0 0) (= |ULTIMATE.start_main_~#main__a~0#1.offset| 0))' at error location [2023-11-19 05:03:00,935 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:03:00,935 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:03:00,935 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-19 05:03:00,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194025298] [2023-11-19 05:03:00,936 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:03:00,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:03:00,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:03:00,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:03:00,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:03:00,938 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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) [2023-11-19 05:03:00,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:03:00,957 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2023-11-19 05:03:00,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:03:00,957 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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) Word has length 11 [2023-11-19 05:03:00,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:03:00,958 INFO L225 Difference]: With dead ends: 24 [2023-11-19 05:03:00,958 INFO L226 Difference]: Without dead ends: 15 [2023-11-19 05:03:00,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:03:00,960 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:03:00,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 35 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:03:00,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-19 05:03:00,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-19 05:03:00,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 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) [2023-11-19 05:03:00,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2023-11-19 05:03:00,967 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2023-11-19 05:03:00,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:03:00,968 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2023-11-19 05:03:00,968 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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) [2023-11-19 05:03:00,968 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2023-11-19 05:03:00,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 05:03:00,969 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:03:00,969 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:03:00,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:03:01,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:01,188 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:03:01,188 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:03:01,188 INFO L85 PathProgramCache]: Analyzing trace with hash 732164048, now seen corresponding path program 2 times [2023-11-19 05:03:01,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:03:01,189 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381816269] [2023-11-19 05:03:01,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:03:01,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:03:01,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:01,401 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:03:01,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:03:01,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381816269] [2023-11-19 05:03:01,402 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [381816269] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:03:01,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402461657] [2023-11-19 05:03:01,402 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:03:01,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:01,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:03:01,404 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:03:01,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:03:01,481 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 05:03:01,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:03:01,483 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-19 05:03:01,486 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:03:01,524 INFO L378 Elim1Store]: Elim1 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 15 treesize of output 11 [2023-11-19 05:03:01,566 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:03:01,566 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 15 [2023-11-19 05:03:01,645 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:03:01,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:03:01,726 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2023-11-19 05:03:01,733 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 12 [2023-11-19 05:03:01,743 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:03:01,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402461657] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:03:01,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1167076707] [2023-11-19 05:03:01,746 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:03:01,747 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:03:01,747 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:03:01,747 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:03:01,747 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:03:02,188 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:03:02,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '359#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~main__pos~0#1| 99999) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~main__marker~0#1| 2147483647) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (<= 0 |ULTIMATE.start_main_~main__pos~0#1|) (<= (+ |ULTIMATE.start_main_~main__pos~0#1| 1) |ULTIMATE.start_main_~main__i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~main__marker~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#main__a~0#1.base|) (= ~__return_60~0 0) (= ~__return_main~0 0) (= |ULTIMATE.start_main_~#main__a~0#1.offset| 0))' at error location [2023-11-19 05:03:02,681 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:03:02,681 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:03:02,682 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 15 [2023-11-19 05:03:02,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987614898] [2023-11-19 05:03:02,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:03:02,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-19 05:03:02,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:03:02,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-19 05:03:02,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2023-11-19 05:03:02,684 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 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) [2023-11-19 05:03:02,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:03:02,895 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2023-11-19 05:03:02,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-19 05:03:02,895 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 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 14 [2023-11-19 05:03:02,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:03:02,896 INFO L225 Difference]: With dead ends: 31 [2023-11-19 05:03:02,896 INFO L226 Difference]: Without dead ends: 20 [2023-11-19 05:03:02,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 23 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=126, Invalid=576, Unknown=0, NotChecked=0, Total=702 [2023-11-19 05:03:02,898 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:03:02,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 20 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:03:02,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-19 05:03:02,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-19 05:03:02,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 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) [2023-11-19 05:03:02,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2023-11-19 05:03:02,904 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2023-11-19 05:03:02,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:03:02,905 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2023-11-19 05:03:02,905 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 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) [2023-11-19 05:03:02,905 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2023-11-19 05:03:02,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 05:03:02,906 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:03:02,906 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:03:02,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:03:03,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:03,133 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:03:03,133 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:03:03,133 INFO L85 PathProgramCache]: Analyzing trace with hash -635184510, now seen corresponding path program 3 times [2023-11-19 05:03:03,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:03:03,134 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436879191] [2023-11-19 05:03:03,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:03:03,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:03:03,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:03,262 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:03:03,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:03:03,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436879191] [2023-11-19 05:03:03,262 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436879191] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:03:03,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027760602] [2023-11-19 05:03:03,263 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:03:03,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:03,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:03:03,264 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:03:03,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:03:03,347 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:03:03,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:03:03,348 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:03:03,350 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:03:03,371 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:03:03,371 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:03:03,453 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:03:03,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027760602] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:03:03,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [621440707] [2023-11-19 05:03:03,459 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:03:03,459 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:03:03,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:03:03,460 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:03:03,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:03:03,817 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:03:04,219 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '563#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~main__pos~0#1| 99999) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~main__marker~0#1| 2147483647) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (<= 0 |ULTIMATE.start_main_~main__pos~0#1|) (<= (+ |ULTIMATE.start_main_~main__pos~0#1| 1) |ULTIMATE.start_main_~main__i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~main__marker~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#main__a~0#1.base|) (= ~__return_60~0 0) (= ~__return_main~0 0) (= |ULTIMATE.start_main_~#main__a~0#1.offset| 0))' at error location [2023-11-19 05:03:04,219 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:03:04,219 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:03:04,220 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2023-11-19 05:03:04,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413323621] [2023-11-19 05:03:04,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:03:04,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-19 05:03:04,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:03:04,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-19 05:03:04,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=292, Unknown=0, NotChecked=0, Total=420 [2023-11-19 05:03:04,222 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 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) [2023-11-19 05:03:04,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:03:04,253 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2023-11-19 05:03:04,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 05:03:04,254 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 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) Word has length 19 [2023-11-19 05:03:04,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:03:04,255 INFO L225 Difference]: With dead ends: 40 [2023-11-19 05:03:04,255 INFO L226 Difference]: Without dead ends: 27 [2023-11-19 05:03:04,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=128, Invalid=292, Unknown=0, NotChecked=0, Total=420 [2023-11-19 05:03:04,257 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:03:04,257 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:03:04,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-19 05:03:04,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-19 05:03:04,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:03:04,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2023-11-19 05:03:04,279 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 19 [2023-11-19 05:03:04,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:03:04,280 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2023-11-19 05:03:04,280 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 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) [2023-11-19 05:03:04,280 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2023-11-19 05:03:04,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 05:03:04,281 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:03:04,281 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:03:04,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:03:04,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:04,502 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:03:04,503 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:03:04,503 INFO L85 PathProgramCache]: Analyzing trace with hash -1819570410, now seen corresponding path program 4 times [2023-11-19 05:03:04,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:03:04,503 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120373228] [2023-11-19 05:03:04,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:03:04,504 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:03:04,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:04,886 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:03:04,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:03:04,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120373228] [2023-11-19 05:03:04,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120373228] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:03:04,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976032725] [2023-11-19 05:03:04,887 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:03:04,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:04,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:03:04,888 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:03:04,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:03:04,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:04,987 INFO L262 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 05:03:04,995 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:03:05,025 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:03:05,025 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:03:05,346 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:03:05,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976032725] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:03:05,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1157146446] [2023-11-19 05:03:05,348 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:03:05,349 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:03:05,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:03:05,349 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:03:05,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:03:05,644 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:03:06,030 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '841#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~main__pos~0#1| 99999) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~main__marker~0#1| 2147483647) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (<= 0 |ULTIMATE.start_main_~main__pos~0#1|) (<= (+ |ULTIMATE.start_main_~main__pos~0#1| 1) |ULTIMATE.start_main_~main__i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~main__marker~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#main__a~0#1.base|) (= ~__return_60~0 0) (= ~__return_main~0 0) (= |ULTIMATE.start_main_~#main__a~0#1.offset| 0))' at error location [2023-11-19 05:03:06,030 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:03:06,030 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:03:06,030 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2023-11-19 05:03:06,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094682843] [2023-11-19 05:03:06,031 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:03:06,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-19 05:03:06,031 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:03:06,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-19 05:03:06,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=429, Invalid=761, Unknown=0, NotChecked=0, Total=1190 [2023-11-19 05:03:06,034 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 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) [2023-11-19 05:03:06,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:03:06,106 INFO L93 Difference]: Finished difference Result 54 states and 69 transitions. [2023-11-19 05:03:06,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-11-19 05:03:06,106 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 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 26 [2023-11-19 05:03:06,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:03:06,110 INFO L225 Difference]: With dead ends: 54 [2023-11-19 05:03:06,111 INFO L226 Difference]: Without dead ends: 41 [2023-11-19 05:03:06,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=429, Invalid=761, Unknown=0, NotChecked=0, Total=1190 [2023-11-19 05:03:06,114 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:03:06,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:03:06,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-19 05:03:06,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-19 05:03:06,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 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) [2023-11-19 05:03:06,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2023-11-19 05:03:06,134 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 26 [2023-11-19 05:03:06,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:03:06,139 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2023-11-19 05:03:06,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 28 states have internal predecessors, (37), 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) [2023-11-19 05:03:06,142 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2023-11-19 05:03:06,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-19 05:03:06,144 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:03:06,145 INFO L195 NwaCegarLoop]: trace histogram [26, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:03:06,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:03:06,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:06,360 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:03:06,360 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:03:06,360 INFO L85 PathProgramCache]: Analyzing trace with hash 481652118, now seen corresponding path program 5 times [2023-11-19 05:03:06,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:03:06,360 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483800116] [2023-11-19 05:03:06,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:03:06,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:03:06,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:07,267 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:03:07,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:03:07,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483800116] [2023-11-19 05:03:07,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483800116] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:03:07,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622579883] [2023-11-19 05:03:07,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:03:07,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:07,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:03:07,270 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:03:07,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:03:07,393 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-19 05:03:07,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:03:07,394 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 05:03:07,397 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:03:07,428 INFO L378 Elim1Store]: Elim1 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 15 treesize of output 11 [2023-11-19 05:03:07,749 INFO L349 Elim1Store]: treesize reduction 8, result has 83.7 percent of original size [2023-11-19 05:03:07,750 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 55 [2023-11-19 05:03:08,019 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-11-19 05:03:08,019 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:03:08,514 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 45 [2023-11-19 05:03:08,536 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:03:08,536 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 58 [2023-11-19 05:03:08,584 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-11-19 05:03:08,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [622579883] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:03:08,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1840200714] [2023-11-19 05:03:08,587 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:03:08,588 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:03:08,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:03:08,588 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:03:08,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:03:08,864 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:03:09,484 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1275#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~main__pos~0#1| 99999) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~main__marker~0#1| 2147483647) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (<= 0 |ULTIMATE.start_main_~main__pos~0#1|) (<= (+ |ULTIMATE.start_main_~main__pos~0#1| 1) |ULTIMATE.start_main_~main__i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~main__marker~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#main__a~0#1.base|) (= ~__return_60~0 0) (= ~__return_main~0 0) (= |ULTIMATE.start_main_~#main__a~0#1.offset| 0))' at error location [2023-11-19 05:03:09,484 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:03:09,485 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:03:09,485 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 11, 11] total 45 [2023-11-19 05:03:09,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725448339] [2023-11-19 05:03:09,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:03:09,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-11-19 05:03:09,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:03:09,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-11-19 05:03:09,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=2036, Unknown=0, NotChecked=0, Total=2550 [2023-11-19 05:03:09,489 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 45 states have internal predecessors, (58), 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) [2023-11-19 05:03:10,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:03:10,482 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2023-11-19 05:03:10,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-11-19 05:03:10,482 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 45 states have internal predecessors, (58), 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 40 [2023-11-19 05:03:10,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:03:10,484 INFO L225 Difference]: With dead ends: 67 [2023-11-19 05:03:10,484 INFO L226 Difference]: Without dead ends: 50 [2023-11-19 05:03:10,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 91 SyntacticMatches, 6 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1173 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=669, Invalid=3237, Unknown=0, NotChecked=0, Total=3906 [2023-11-19 05:03:10,488 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 33 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:03:10,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 24 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:03:10,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-19 05:03:10,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-19 05:03:10,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 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) [2023-11-19 05:03:10,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2023-11-19 05:03:10,499 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 40 [2023-11-19 05:03:10,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:03:10,500 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2023-11-19 05:03:10,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.288888888888889) internal successors, (58), 45 states have internal predecessors, (58), 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) [2023-11-19 05:03:10,500 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2023-11-19 05:03:10,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-11-19 05:03:10,502 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:03:10,502 INFO L195 NwaCegarLoop]: trace histogram [27, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:03:10,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-19 05:03:10,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:10,704 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:03:10,704 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:03:10,704 INFO L85 PathProgramCache]: Analyzing trace with hash 1959265166, now seen corresponding path program 6 times [2023-11-19 05:03:10,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:03:10,704 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227416073] [2023-11-19 05:03:10,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:03:10,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:03:10,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:11,626 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-19 05:03:11,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:03:11,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227416073] [2023-11-19 05:03:11,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227416073] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:03:11,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435115842] [2023-11-19 05:03:11,627 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:03:11,627 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:11,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:03:11,629 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:03:11,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:03:11,772 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:03:11,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:03:11,775 INFO L262 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-19 05:03:11,779 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:03:11,851 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-19 05:03:11,852 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:03:13,000 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-19 05:03:13,001 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435115842] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:03:13,001 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [559590902] [2023-11-19 05:03:13,003 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:03:13,003 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:03:13,004 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:03:13,004 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:03:13,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:03:13,316 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:03:13,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1825#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~main__pos~0#1| 99999) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~main__marker~0#1| 2147483647) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (<= 0 |ULTIMATE.start_main_~main__pos~0#1|) (<= (+ |ULTIMATE.start_main_~main__pos~0#1| 1) |ULTIMATE.start_main_~main__i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~main__marker~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#main__a~0#1.base|) (= ~__return_60~0 0) (= ~__return_main~0 0) (= |ULTIMATE.start_main_~#main__a~0#1.offset| 0))' at error location [2023-11-19 05:03:13,947 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:03:13,947 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:03:13,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 58 [2023-11-19 05:03:13,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455435764] [2023-11-19 05:03:13,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:03:13,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-11-19 05:03:13,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:03:13,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-11-19 05:03:13,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1734, Invalid=2426, Unknown=0, NotChecked=0, Total=4160 [2023-11-19 05:03:13,953 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 58 states have internal predecessors, (67), 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) [2023-11-19 05:03:14,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:03:14,062 INFO L93 Difference]: Finished difference Result 100 states and 130 transitions. [2023-11-19 05:03:14,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-11-19 05:03:14,063 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 58 states have internal predecessors, (67), 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 49 [2023-11-19 05:03:14,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:03:14,064 INFO L225 Difference]: With dead ends: 100 [2023-11-19 05:03:14,064 INFO L226 Difference]: Without dead ends: 79 [2023-11-19 05:03:14,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 103 SyntacticMatches, 8 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1295 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1734, Invalid=2426, Unknown=0, NotChecked=0, Total=4160 [2023-11-19 05:03:14,068 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:03:14,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 35 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:03:14,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-19 05:03:14,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2023-11-19 05:03:14,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 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) [2023-11-19 05:03:14,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2023-11-19 05:03:14,089 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 49 [2023-11-19 05:03:14,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:03:14,089 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2023-11-19 05:03:14,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 58 states have internal predecessors, (67), 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) [2023-11-19 05:03:14,090 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2023-11-19 05:03:14,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-11-19 05:03:14,092 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:03:14,092 INFO L195 NwaCegarLoop]: trace histogram [56, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:03:14,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:03:14,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-19 05:03:14,306 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:03:14,306 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:03:14,306 INFO L85 PathProgramCache]: Analyzing trace with hash -732466782, now seen corresponding path program 7 times [2023-11-19 05:03:14,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:03:14,306 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564810388] [2023-11-19 05:03:14,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:03:14,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:03:14,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:17,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-19 05:03:17,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:03:17,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564810388] [2023-11-19 05:03:17,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564810388] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:03:17,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757480161] [2023-11-19 05:03:17,509 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:03:17,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:17,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:03:17,512 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:03:17,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:03:17,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:17,730 INFO L262 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 58 conjunts are in the unsatisfiable core [2023-11-19 05:03:17,736 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:03:17,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-19 05:03:17,828 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:03:22,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-19 05:03:22,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1757480161] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:03:22,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [577192828] [2023-11-19 05:03:22,197 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:03:22,197 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:03:22,197 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:03:22,198 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:03:22,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:03:22,475 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:03:23,572 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2703#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~main__pos~0#1| 99999) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~main__marker~0#1| 2147483647) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (<= 0 |ULTIMATE.start_main_~main__pos~0#1|) (<= (+ |ULTIMATE.start_main_~main__pos~0#1| 1) |ULTIMATE.start_main_~main__i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~main__marker~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#main__a~0#1.base|) (= ~__return_60~0 0) (= ~__return_main~0 0) (= |ULTIMATE.start_main_~#main__a~0#1.offset| 0))' at error location [2023-11-19 05:03:23,572 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:03:23,572 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:03:23,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 116 [2023-11-19 05:03:23,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725084819] [2023-11-19 05:03:23,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:03:23,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2023-11-19 05:03:23,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:03:23,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2023-11-19 05:03:23,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6809, Invalid=8197, Unknown=0, NotChecked=0, Total=15006 [2023-11-19 05:03:23,584 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 117 states, 117 states have (on average 1.0683760683760684) 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) [2023-11-19 05:03:23,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:03:23,805 INFO L93 Difference]: Finished difference Result 158 states and 217 transitions. [2023-11-19 05:03:23,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2023-11-19 05:03:23,805 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.0683760683760684) 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 78 [2023-11-19 05:03:23,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:03:23,808 INFO L225 Difference]: With dead ends: 158 [2023-11-19 05:03:23,808 INFO L226 Difference]: Without dead ends: 137 [2023-11-19 05:03:23,814 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 161 SyntacticMatches, 8 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2629 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=6809, Invalid=8197, Unknown=0, NotChecked=0, Total=15006 [2023-11-19 05:03:23,816 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:03:23,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:03:23,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2023-11-19 05:03:23,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2023-11-19 05:03:23,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.0147058823529411) internal successors, (138), 136 states have internal predecessors, (138), 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) [2023-11-19 05:03:23,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2023-11-19 05:03:23,866 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 78 [2023-11-19 05:03:23,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:03:23,867 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2023-11-19 05:03:23,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.0683760683760684) 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) [2023-11-19 05:03:23,868 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2023-11-19 05:03:23,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-11-19 05:03:23,875 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:03:23,875 INFO L195 NwaCegarLoop]: trace histogram [114, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:03:23,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:03:24,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:24,092 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:03:24,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:03:24,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1566710050, now seen corresponding path program 8 times [2023-11-19 05:03:24,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:03:24,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178697235] [2023-11-19 05:03:24,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:03:24,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:03:24,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:03:33,654 INFO L134 CoverageAnalysis]: Checked inductivity of 6611 backedges. 0 proven. 6555 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-19 05:03:33,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:03:33,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178697235] [2023-11-19 05:03:33,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178697235] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:03:33,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337968046] [2023-11-19 05:03:33,655 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:03:33,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:03:33,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:03:33,656 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:03:33,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_070c1973-5771-4b06-a9d9-76b5d1ff82cc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:03:34,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-11-19 05:03:34,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:03:34,227 INFO L262 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 49 conjunts are in the unsatisfiable core [2023-11-19 05:03:34,237 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:03:34,583 INFO L378 Elim1Store]: Elim1 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 13 treesize of output 9 [2023-11-19 05:03:36,902 INFO L349 Elim1Store]: treesize reduction 24, result has 86.7 percent of original size [2023-11-19 05:03:36,902 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 7 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 81 treesize of output 187 [2023-11-19 05:03:37,620 INFO L134 CoverageAnalysis]: Checked inductivity of 6611 backedges. 0 proven. 170 refuted. 0 times theorem prover too weak. 6441 trivial. 0 not checked. [2023-11-19 05:03:37,621 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:03:40,916 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 124 treesize of output 110 [2023-11-19 05:03:41,016 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 05:03:41,016 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 129 treesize of output 218 [2023-11-19 05:03:41,257 INFO L134 CoverageAnalysis]: Checked inductivity of 6611 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 6555 trivial. 0 not checked. [2023-11-19 05:03:41,258 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337968046] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:03:41,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [215477136] [2023-11-19 05:03:41,259 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:03:41,260 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:03:41,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:03:41,260 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:03:41,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:03:41,459 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:03:43,592 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4196#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~main__pos~0#1| 99999) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= |ULTIMATE.start_main_~main__marker~0#1| 2147483647) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (<= 0 |ULTIMATE.start_main_~main__pos~0#1|) (<= (+ |ULTIMATE.start_main_~main__pos~0#1| 1) |ULTIMATE.start_main_~main__i~0#1|) (<= 0 (+ |ULTIMATE.start_main_~main__marker~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#main__a~0#1.base|) (= ~__return_60~0 0) (= ~__return_main~0 0) (= |ULTIMATE.start_main_~#main__a~0#1.offset| 0))' at error location [2023-11-19 05:03:43,592 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:03:43,592 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:03:43,592 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 20, 19] total 152 [2023-11-19 05:03:43,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267246525] [2023-11-19 05:03:43,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:03:43,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2023-11-19 05:03:43,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:03:43,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2023-11-19 05:03:43,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7229, Invalid=17577, Unknown=0, NotChecked=0, Total=24806 [2023-11-19 05:03:43,603 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand has 152 states, 152 states have (on average 1.0986842105263157) internal successors, (167), 152 states have internal predecessors, (167), 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)