./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX --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 45c2395b28f523380bfcff26ce2efb02406d69c6cc122ac9297e3f35ef9c7306 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:55:37,781 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:55:37,870 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:55:37,877 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:55:37,878 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:55:37,919 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:55:37,920 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:55:37,921 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:55:37,922 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:55:37,927 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:55:37,927 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:55:37,928 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:55:37,929 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:55:37,930 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:55:37,931 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:55:37,931 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:55:37,932 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:55:37,932 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:55:37,932 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:55:37,933 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:55:37,933 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:55:37,934 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:55:37,935 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:55:37,935 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:55:37,935 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:55:37,936 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:55:37,936 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:55:37,936 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:55:37,937 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:55:37,937 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:55:37,938 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:55:37,939 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:55:37,939 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:55:37,939 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:55:37,939 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:55:37,939 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:55:37,940 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:55:37,940 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:55:37,940 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:55:37,940 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:55:37,941 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:55:37,941 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:55:37,941 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:55:37,941 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:55:37,942 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:55:37,942 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_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45c2395b28f523380bfcff26ce2efb02406d69c6cc122ac9297e3f35ef9c7306 [2023-11-12 00:55:38,246 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:55:38,278 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:55:38,280 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:55:38,282 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:55:38,282 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:55:38,284 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.i [2023-11-12 00:55:41,436 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:55:41,628 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:55:41,628 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i [2023-11-12 00:55:41,637 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/data/441c9f1e8/072717c22ce640da8213af314939d78e/FLAGdc947770a [2023-11-12 00:55:41,653 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/data/441c9f1e8/072717c22ce640da8213af314939d78e [2023-11-12 00:55:41,656 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:55:41,658 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:55:41,659 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:55:41,659 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:55:41,665 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:55:41,666 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,667 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1411d519 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41, skipping insertion in model container [2023-11-12 00:55:41,667 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,690 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:55:41,848 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_eb63d864-9f4c-4171-8f29-f4fd11b831b8/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i[817,830] [2023-11-12 00:55:41,867 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:55:41,877 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:55:41,890 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_eb63d864-9f4c-4171-8f29-f4fd11b831b8/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i[817,830] [2023-11-12 00:55:41,899 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:55:41,915 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:55:41,915 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41 WrapperNode [2023-11-12 00:55:41,916 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:55:41,917 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:55:41,917 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:55:41,917 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:55:41,926 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,933 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,955 INFO L138 Inliner]: procedures = 16, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 85 [2023-11-12 00:55:41,955 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:55:41,956 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:55:41,956 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:55:41,956 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:55:41,965 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,965 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,967 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,967 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,973 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,983 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,984 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,985 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:41,988 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:55:41,989 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:55:41,989 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:55:41,989 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:55:41,990 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (1/1) ... [2023-11-12 00:55:42,005 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:55:42,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:42,037 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:55:42,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:55:42,085 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:55:42,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:55:42,086 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:55:42,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:55:42,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:55:42,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:55:42,088 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:55:42,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:55:42,180 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:55:42,183 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:55:42,438 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:55:42,504 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:55:42,504 INFO L302 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-12 00:55:42,511 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:55:42 BoogieIcfgContainer [2023-11-12 00:55:42,512 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:55:42,515 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:55:42,516 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:55:42,519 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:55:42,520 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:55:41" (1/3) ... [2023-11-12 00:55:42,522 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c2867c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:55:42, skipping insertion in model container [2023-11-12 00:55:42,522 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:55:41" (2/3) ... [2023-11-12 00:55:42,524 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c2867c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:55:42, skipping insertion in model container [2023-11-12 00:55:42,524 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:55:42" (3/3) ... [2023-11-12 00:55:42,526 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_allDiff2_ground.i [2023-11-12 00:55:42,548 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:55:42,548 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:55:42,601 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:55:42,612 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;@1c5f0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:55:42,613 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:55:42,618 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:42,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:55:42,625 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:42,627 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:42,627 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:42,636 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:42,637 INFO L85 PathProgramCache]: Analyzing trace with hash 1351508791, now seen corresponding path program 1 times [2023-11-12 00:55:42,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:42,651 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22012946] [2023-11-12 00:55:42,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:42,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:42,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:42,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:42,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:42,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22012946] [2023-11-12 00:55:42,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22012946] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:42,859 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:55:42,859 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:55:42,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429140804] [2023-11-12 00:55:42,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:42,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:55:42,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:42,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:55:42,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:55:42,899 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2023-11-12 00:55:42,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:42,941 INFO L93 Difference]: Finished difference Result 25 states and 37 transitions. [2023-11-12 00:55:42,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:55:42,944 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 [2023-11-12 00:55:42,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:42,952 INFO L225 Difference]: With dead ends: 25 [2023-11-12 00:55:42,952 INFO L226 Difference]: Without dead ends: 12 [2023-11-12 00:55:42,955 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 [2023-11-12 00:55:42,965 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:42,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:55:42,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-12 00:55:42,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-12 00:55:42,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 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) [2023-11-12 00:55:42,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2023-11-12 00:55:42,996 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 8 [2023-11-12 00:55:42,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:42,996 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2023-11-12 00:55:42,997 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) [2023-11-12 00:55:42,997 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2023-11-12 00:55:42,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:55:42,997 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:42,998 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:42,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:55:42,998 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:42,999 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:42,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1990215639, now seen corresponding path program 1 times [2023-11-12 00:55:42,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:43,000 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784064976] [2023-11-12 00:55:43,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:43,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:43,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:43,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:55:43,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:43,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784064976] [2023-11-12 00:55:43,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784064976] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:43,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549892775] [2023-11-12 00:55:43,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:43,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:43,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:43,137 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:43,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:55:43,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:43,261 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:55:43,266 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:43,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:55:43,310 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:55:43,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [549892775] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:43,311 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:55:43,312 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3] total 5 [2023-11-12 00:55:43,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608291387] [2023-11-12 00:55:43,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:43,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:55:43,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:43,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:55:43,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:55:43,315 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2023-11-12 00:55:43,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:43,378 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2023-11-12 00:55:43,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:55:43,379 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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 [2023-11-12 00:55:43,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:43,379 INFO L225 Difference]: With dead ends: 21 [2023-11-12 00:55:43,380 INFO L226 Difference]: Without dead ends: 14 [2023-11-12 00:55:43,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:55:43,382 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 3 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:43,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 17 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:55:43,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-12 00:55:43,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2023-11-12 00:55:43,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:43,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2023-11-12 00:55:43,390 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 9 [2023-11-12 00:55:43,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:43,390 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2023-11-12 00:55:43,391 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2023-11-12 00:55:43,391 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2023-11-12 00:55:43,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:55:43,392 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:43,392 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:43,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-12 00:55:43,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:43,595 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:43,595 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:43,595 INFO L85 PathProgramCache]: Analyzing trace with hash -2013335574, now seen corresponding path program 1 times [2023-11-12 00:55:43,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:43,596 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271794482] [2023-11-12 00:55:43,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:43,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:43,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:43,733 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:55:43,734 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:43,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271794482] [2023-11-12 00:55:43,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271794482] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:43,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946550131] [2023-11-12 00:55:43,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:43,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:43,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:43,736 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:43,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:55:43,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:43,798 INFO L262 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:55:43,800 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:43,816 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:55:43,816 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:43,838 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:55:43,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946550131] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:43,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1634507527] [2023-11-12 00:55:43,869 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:55:43,870 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:43,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:43,880 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:43,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:44,297 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:44,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1634507527] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:44,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:44,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2023-11-12 00:55:44,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154836715] [2023-11-12 00:55:44,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:44,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:55:44,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:44,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:55:44,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:55:44,370 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 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) [2023-11-12 00:55:44,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:44,418 INFO L93 Difference]: Finished difference Result 24 states and 33 transitions. [2023-11-12 00:55:44,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:55:44,419 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 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) Word has length 11 [2023-11-12 00:55:44,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:44,420 INFO L225 Difference]: With dead ends: 24 [2023-11-12 00:55:44,420 INFO L226 Difference]: Without dead ends: 15 [2023-11-12 00:55:44,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:55:44,422 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:44,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 8 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:55:44,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-12 00:55:44,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2023-11-12 00:55:44,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:44,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2023-11-12 00:55:44,429 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 11 [2023-11-12 00:55:44,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:44,429 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2023-11-12 00:55:44,430 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 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) [2023-11-12 00:55:44,430 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2023-11-12 00:55:44,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 00:55:44,431 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:44,431 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:44,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:44,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:44,641 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:44,642 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:44,642 INFO L85 PathProgramCache]: Analyzing trace with hash -1618153397, now seen corresponding path program 1 times [2023-11-12 00:55:44,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:44,642 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773746604] [2023-11-12 00:55:44,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:44,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:44,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:44,750 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:55:44,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:44,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773746604] [2023-11-12 00:55:44,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773746604] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:44,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880638888] [2023-11-12 00:55:44,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:44,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:44,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:44,753 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:44,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:55:44,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:44,817 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:55:44,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:44,829 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:55:44,829 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:44,847 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:55:44,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880638888] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:44,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029536173] [2023-11-12 00:55:44,853 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:55:44,854 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:44,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:44,854 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:44,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:45,289 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:45,506 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '356#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-12 00:55:45,506 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:45,506 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:45,506 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-12 00:55:45,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908730968] [2023-11-12 00:55:45,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:45,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:55:45,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:45,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:55:45,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:55:45,509 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:45,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:45,585 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2023-11-12 00:55:45,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:55:45,586 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-12 00:55:45,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:45,587 INFO L225 Difference]: With dead ends: 46 [2023-11-12 00:55:45,587 INFO L226 Difference]: Without dead ends: 35 [2023-11-12 00:55:45,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:55:45,592 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 35 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:45,594 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 24 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:55:45,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-12 00:55:45,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 17. [2023-11-12 00:55:45,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 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) [2023-11-12 00:55:45,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-12 00:55:45,609 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2023-11-12 00:55:45,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:45,610 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-12 00:55:45,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:45,610 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-12 00:55:45,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:55:45,611 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:45,612 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:45,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:45,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:45,817 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:45,818 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:45,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1151635221, now seen corresponding path program 2 times [2023-11-12 00:55:45,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:45,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216689113] [2023-11-12 00:55:45,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:45,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:45,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:45,971 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-12 00:55:45,971 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:45,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216689113] [2023-11-12 00:55:45,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216689113] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:45,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294436071] [2023-11-12 00:55:45,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:55:45,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:45,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:45,977 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:46,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:55:46,051 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:55:46,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:55:46,053 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:55:46,054 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:46,074 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-12 00:55:46,075 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:46,119 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-12 00:55:46,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294436071] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:46,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1453395273] [2023-11-12 00:55:46,126 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:55:46,127 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:46,127 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:46,127 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:46,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:46,450 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:46,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '555#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-12 00:55:46,694 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:46,694 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:46,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-11-12 00:55:46,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290595824] [2023-11-12 00:55:46,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:46,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 00:55:46,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:46,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 00:55:46,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2023-11-12 00:55:46,698 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 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) [2023-11-12 00:55:46,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:46,799 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2023-11-12 00:55:46,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 00:55:46,800 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 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) Word has length 15 [2023-11-12 00:55:46,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:46,801 INFO L225 Difference]: With dead ends: 32 [2023-11-12 00:55:46,802 INFO L226 Difference]: Without dead ends: 23 [2023-11-12 00:55:46,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2023-11-12 00:55:46,804 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 8 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:46,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:46,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-12 00:55:46,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-12 00:55:46,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:46,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2023-11-12 00:55:46,816 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 15 [2023-11-12 00:55:46,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:46,817 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2023-11-12 00:55:46,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 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) [2023-11-12 00:55:46,817 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2023-11-12 00:55:46,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-12 00:55:46,818 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:46,819 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:46,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:47,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:47,024 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:47,025 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:47,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1122021404, now seen corresponding path program 3 times [2023-11-12 00:55:47,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:47,025 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310337447] [2023-11-12 00:55:47,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:47,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:47,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:47,189 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:55:47,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:47,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310337447] [2023-11-12 00:55:47,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310337447] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:47,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748330875] [2023-11-12 00:55:47,193 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:55:47,193 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:47,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:47,194 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:47,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:55:47,271 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:55:47,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:55:47,273 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-12 00:55:47,275 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:47,306 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-12 00:55:47,306 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:47,388 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-12 00:55:47,389 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748330875] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:47,389 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1942515210] [2023-11-12 00:55:47,392 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:55:47,392 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:47,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:47,393 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:47,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:47,669 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:47,915 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '794#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-12 00:55:47,916 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:47,916 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:47,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 14 [2023-11-12 00:55:47,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100200457] [2023-11-12 00:55:47,917 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:47,917 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 00:55:47,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:47,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 00:55:47,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=349, Unknown=0, NotChecked=0, Total=462 [2023-11-12 00:55:47,920 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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) [2023-11-12 00:55:48,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:48,153 INFO L93 Difference]: Finished difference Result 65 states and 97 transitions. [2023-11-12 00:55:48,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-12 00:55:48,154 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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 21 [2023-11-12 00:55:48,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:48,155 INFO L225 Difference]: With dead ends: 65 [2023-11-12 00:55:48,155 INFO L226 Difference]: Without dead ends: 42 [2023-11-12 00:55:48,158 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=589, Unknown=0, NotChecked=0, Total=756 [2023-11-12 00:55:48,159 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 23 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:48,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 35 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:55:48,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-12 00:55:48,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-11-12 00:55:48,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.3414634146341464) internal successors, (55), 41 states have internal predecessors, (55), 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) [2023-11-12 00:55:48,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2023-11-12 00:55:48,181 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 21 [2023-11-12 00:55:48,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:48,181 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2023-11-12 00:55:48,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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) [2023-11-12 00:55:48,183 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2023-11-12 00:55:48,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-12 00:55:48,185 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:48,185 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:48,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:48,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-12 00:55:48,392 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:48,392 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:48,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1970982134, now seen corresponding path program 4 times [2023-11-12 00:55:48,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:48,393 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993944405] [2023-11-12 00:55:48,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:48,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:48,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:48,686 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-11-12 00:55:48,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:48,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993944405] [2023-11-12 00:55:48,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993944405] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:48,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150747419] [2023-11-12 00:55:48,690 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:55:48,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:48,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:48,691 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:48,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:55:48,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:48,806 INFO L262 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-12 00:55:48,808 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:48,848 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-11-12 00:55:48,848 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:49,116 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-11-12 00:55:49,116 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150747419] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:49,117 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [340098954] [2023-11-12 00:55:49,119 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:55:49,119 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:49,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:49,120 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:49,120 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:49,376 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:49,656 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1266#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-12 00:55:49,656 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:49,656 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:49,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2023-11-12 00:55:49,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333108371] [2023-11-12 00:55:49,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:49,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-12 00:55:49,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:49,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-12 00:55:49,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=806, Unknown=0, NotChecked=0, Total=1190 [2023-11-12 00:55:49,660 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 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) [2023-11-12 00:55:50,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:50,001 INFO L93 Difference]: Finished difference Result 201 states and 278 transitions. [2023-11-12 00:55:50,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-12 00:55:50,002 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 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 40 [2023-11-12 00:55:50,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:50,004 INFO L225 Difference]: With dead ends: 201 [2023-11-12 00:55:50,004 INFO L226 Difference]: Without dead ends: 172 [2023-11-12 00:55:50,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=384, Invalid=806, Unknown=0, NotChecked=0, Total=1190 [2023-11-12 00:55:50,006 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 365 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:50,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [365 Valid, 96 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:55:50,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2023-11-12 00:55:50,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 55. [2023-11-12 00:55:50,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 54 states have internal predecessors, (68), 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) [2023-11-12 00:55:50,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2023-11-12 00:55:50,025 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 40 [2023-11-12 00:55:50,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:50,025 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2023-11-12 00:55:50,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 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) [2023-11-12 00:55:50,025 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2023-11-12 00:55:50,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-11-12 00:55:50,027 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:50,027 INFO L195 NwaCegarLoop]: trace histogram [24, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:50,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:50,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:50,234 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:50,234 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:50,234 INFO L85 PathProgramCache]: Analyzing trace with hash -36652650, now seen corresponding path program 5 times [2023-11-12 00:55:50,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:50,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852362847] [2023-11-12 00:55:50,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:50,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:50,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:51,099 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-11-12 00:55:51,099 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:51,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852362847] [2023-11-12 00:55:51,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1852362847] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:51,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221918289] [2023-11-12 00:55:51,099 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:55:51,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:51,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:51,101 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:51,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:55:51,208 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:55:51,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:55:51,210 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:55:51,214 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:51,301 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2023-11-12 00:55:51,302 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:55:51,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221918289] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:55:51,302 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:55:51,302 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [26] total 30 [2023-11-12 00:55:51,302 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131670343] [2023-11-12 00:55:51,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:55:51,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:55:51,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:51,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:55:51,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=510, Unknown=0, NotChecked=0, Total=870 [2023-11-12 00:55:51,304 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:51,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:51,401 INFO L93 Difference]: Finished difference Result 96 states and 136 transitions. [2023-11-12 00:55:51,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:55:51,402 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2023-11-12 00:55:51,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:51,404 INFO L225 Difference]: With dead ends: 96 [2023-11-12 00:55:51,404 INFO L226 Difference]: Without dead ends: 89 [2023-11-12 00:55:51,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2023-11-12 00:55:51,407 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:51,407 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 17 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:55:51,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-12 00:55:51,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 56. [2023-11-12 00:55:51,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 55 states have internal predecessors, (70), 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) [2023-11-12 00:55:51,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2023-11-12 00:55:51,430 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 53 [2023-11-12 00:55:51,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:51,431 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2023-11-12 00:55:51,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:55:51,431 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2023-11-12 00:55:51,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-12 00:55:51,432 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:51,432 INFO L195 NwaCegarLoop]: trace histogram [24, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:51,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:51,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:51,638 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:51,639 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:51,639 INFO L85 PathProgramCache]: Analyzing trace with hash -470524897, now seen corresponding path program 6 times [2023-11-12 00:55:51,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:51,639 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383543314] [2023-11-12 00:55:51,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:51,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:51,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:52,518 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-11-12 00:55:52,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:52,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383543314] [2023-11-12 00:55:52,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383543314] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:52,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996720703] [2023-11-12 00:55:52,519 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:55:52,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:52,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:52,523 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:52,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:55:52,676 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:55:52,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:55:52,678 INFO L262 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-12 00:55:52,683 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:52,743 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2023-11-12 00:55:52,743 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:53,145 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2023-11-12 00:55:53,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [996720703] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:53,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2083058544] [2023-11-12 00:55:53,148 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:55:53,148 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:53,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:53,148 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:53,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:53,416 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:55:53,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2536#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-12 00:55:53,769 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:55:53,769 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:55:53,770 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14, 14] total 39 [2023-11-12 00:55:53,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063392564] [2023-11-12 00:55:53,773 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:55:53,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-11-12 00:55:53,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:55:53,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-11-12 00:55:53,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=738, Invalid=1424, Unknown=0, NotChecked=0, Total=2162 [2023-11-12 00:55:53,776 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 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) [2023-11-12 00:55:54,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:55:54,925 INFO L93 Difference]: Finished difference Result 224 states and 338 transitions. [2023-11-12 00:55:54,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2023-11-12 00:55:54,926 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 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 54 [2023-11-12 00:55:54,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:55:54,932 INFO L225 Difference]: With dead ends: 224 [2023-11-12 00:55:54,932 INFO L226 Difference]: Without dead ends: 169 [2023-11-12 00:55:54,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 833 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1438, Invalid=3674, Unknown=0, NotChecked=0, Total=5112 [2023-11-12 00:55:54,937 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 216 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:55:54,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [216 Valid, 23 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:55:54,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2023-11-12 00:55:54,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 118. [2023-11-12 00:55:54,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.3418803418803418) internal successors, (157), 117 states have internal predecessors, (157), 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) [2023-11-12 00:55:54,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 157 transitions. [2023-11-12 00:55:54,989 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 157 transitions. Word has length 54 [2023-11-12 00:55:54,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:55:54,990 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 157 transitions. [2023-11-12 00:55:54,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 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) [2023-11-12 00:55:54,990 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 157 transitions. [2023-11-12 00:55:54,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-11-12 00:55:54,992 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:55:54,992 INFO L195 NwaCegarLoop]: trace histogram [36, 35, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:55:55,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:55:55,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:55,198 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:55:55,199 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:55:55,199 INFO L85 PathProgramCache]: Analyzing trace with hash 1630936164, now seen corresponding path program 7 times [2023-11-12 00:55:55,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:55:55,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831370186] [2023-11-12 00:55:55,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:55:55,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:55:55,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:57,029 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2023-11-12 00:55:57,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:55:57,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831370186] [2023-11-12 00:55:57,029 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831370186] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:55:57,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259027104] [2023-11-12 00:55:57,030 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:55:57,030 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:55:57,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:55:57,033 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:55:57,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:55:57,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:55:57,244 INFO L262 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 38 conjunts are in the unsatisfiable core [2023-11-12 00:55:57,250 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:55:57,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2023-11-12 00:55:57,326 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:55:59,419 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2023-11-12 00:55:59,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259027104] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:55:59,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553379289] [2023-11-12 00:55:59,421 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:55:59,422 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:55:59,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:55:59,422 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:55:59,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:55:59,628 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:00,051 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4003#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-12 00:56:00,051 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:00,051 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:00,052 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 76 [2023-11-12 00:56:00,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568070743] [2023-11-12 00:56:00,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:00,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2023-11-12 00:56:00,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:00,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2023-11-12 00:56:00,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2959, Invalid=4181, Unknown=0, NotChecked=0, Total=7140 [2023-11-12 00:56:00,059 INFO L87 Difference]: Start difference. First operand 118 states and 157 transitions. Second operand has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 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) [2023-11-12 00:56:01,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:01,763 INFO L93 Difference]: Finished difference Result 655 states and 922 transitions. [2023-11-12 00:56:01,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2023-11-12 00:56:01,765 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 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 116 [2023-11-12 00:56:01,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:01,769 INFO L225 Difference]: With dead ends: 655 [2023-11-12 00:56:01,769 INFO L226 Difference]: Without dead ends: 575 [2023-11-12 00:56:01,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2959, Invalid=4181, Unknown=0, NotChecked=0, Total=7140 [2023-11-12 00:56:01,774 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2088 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 326 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2088 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 326 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:01,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2088 Valid, 258 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [326 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-12 00:56:01,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2023-11-12 00:56:01,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 156. [2023-11-12 00:56:01,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.2580645161290323) internal successors, (195), 155 states have internal predecessors, (195), 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) [2023-11-12 00:56:01,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 195 transitions. [2023-11-12 00:56:01,837 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 195 transitions. Word has length 116 [2023-11-12 00:56:01,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:01,837 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 195 transitions. [2023-11-12 00:56:01,838 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 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) [2023-11-12 00:56:01,838 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 195 transitions. [2023-11-12 00:56:01,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-11-12 00:56:01,840 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:01,841 INFO L195 NwaCegarLoop]: trace histogram [74, 35, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:01,847 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-12 00:56:02,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:56:02,047 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:02,048 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:02,048 INFO L85 PathProgramCache]: Analyzing trace with hash 532944996, now seen corresponding path program 8 times [2023-11-12 00:56:02,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:02,048 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109087802] [2023-11-12 00:56:02,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:02,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:02,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:07,500 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 0 proven. 2775 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2023-11-12 00:56:07,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:07,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109087802] [2023-11-12 00:56:07,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109087802] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:07,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149330164] [2023-11-12 00:56:07,501 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:56:07,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:07,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:07,503 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:07,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_eb63d864-9f4c-4171-8f29-f4fd11b831b8/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:56:07,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-12 00:56:07,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:56:07,724 INFO L262 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:56:07,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:07,926 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 105 proven. 1 refuted. 0 times theorem prover too weak. 3965 trivial. 0 not checked. [2023-11-12 00:56:07,926 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:56:08,192 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 105 proven. 1 refuted. 0 times theorem prover too weak. 3965 trivial. 0 not checked. [2023-11-12 00:56:08,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149330164] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:56:08,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020094252] [2023-11-12 00:56:08,194 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:56:08,194 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:56:08,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:56:08,195 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:56:08,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:56:08,399 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:56:09,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6428#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-12 00:56:09,001 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:56:09,001 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:56:09,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 6, 6] total 84 [2023-11-12 00:56:09,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964772295] [2023-11-12 00:56:09,001 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:56:09,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2023-11-12 00:56:09,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:09,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2023-11-12 00:56:09,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3210, Invalid=5162, Unknown=0, NotChecked=0, Total=8372 [2023-11-12 00:56:09,007 INFO L87 Difference]: Start difference. First operand 156 states and 195 transitions. Second operand has 84 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 84 states have internal predecessors, (100), 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)