./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/toy.cil.c --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_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/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_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/toy.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/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_f6bac810-9fec-46e2-a280-62723c4f5b06/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 4a8eabec1830ab654b41f6937ec2f9359cd3dd371ede66eafc352bac48edda3b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:15:08,476 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:15:08,597 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:15:08,603 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:15:08,603 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:15:08,642 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:15:08,643 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:15:08,644 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:15:08,645 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:15:08,651 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:15:08,651 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:15:08,652 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:15:08,652 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:15:08,654 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:15:08,654 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:15:08,655 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:15:08,655 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:15:08,656 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:15:08,656 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:15:08,656 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:15:08,657 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:15:08,657 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:15:08,659 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:15:08,659 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:15:08,660 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:15:08,660 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:15:08,660 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:15:08,661 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:15:08,661 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:15:08,662 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:15:08,663 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:15:08,663 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:15:08,663 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:15:08,664 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:15:08,664 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:15:08,664 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:15:08,664 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:15:08,665 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:15:08,665 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:15:08,665 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:15:08,665 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:15:08,666 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:15:08,666 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:15:08,666 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:15:08,667 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:15:08,667 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_f6bac810-9fec-46e2-a280-62723c4f5b06/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4a8eabec1830ab654b41f6937ec2f9359cd3dd371ede66eafc352bac48edda3b [2023-11-12 00:15:08,916 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:15:08,973 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:15:08,978 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:15:08,979 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:15:08,979 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:15:08,982 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/systemc/toy.cil.c [2023-11-12 00:15:12,149 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:15:12,415 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:15:12,416 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/sv-benchmarks/c/systemc/toy.cil.c [2023-11-12 00:15:12,427 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/data/bddb130e4/d03dfd57846445b4a844dd23268721b6/FLAGcd545b513 [2023-11-12 00:15:12,443 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/data/bddb130e4/d03dfd57846445b4a844dd23268721b6 [2023-11-12 00:15:12,445 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:15:12,447 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:15:12,449 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:15:12,449 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:15:12,455 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:15:12,456 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,457 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2238a5c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12, skipping insertion in model container [2023-11-12 00:15:12,457 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,512 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:15:12,671 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_f6bac810-9fec-46e2-a280-62723c4f5b06/sv-benchmarks/c/systemc/toy.cil.c[697,710] [2023-11-12 00:15:12,750 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:15:12,763 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:15:12,779 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_f6bac810-9fec-46e2-a280-62723c4f5b06/sv-benchmarks/c/systemc/toy.cil.c[697,710] [2023-11-12 00:15:12,835 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:15:12,854 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:15:12,855 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12 WrapperNode [2023-11-12 00:15:12,855 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:15:12,856 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:15:12,856 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:15:12,856 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:15:12,862 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,872 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,903 INFO L138 Inliner]: procedures = 20, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 366 [2023-11-12 00:15:12,903 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:15:12,904 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:15:12,904 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:15:12,904 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:15:12,913 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,913 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,917 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,917 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,924 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,933 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,935 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,937 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,941 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:15:12,942 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:15:12,942 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:15:12,943 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:15:12,943 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (1/1) ... [2023-11-12 00:15:12,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:15:12,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:15:12,988 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:15:13,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:15:13,028 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:15:13,028 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:15:13,029 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:15:13,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:15:13,110 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:15:13,112 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:15:13,674 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:15:14,036 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:15:14,037 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-12 00:15:14,040 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:15:14 BoogieIcfgContainer [2023-11-12 00:15:14,040 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:15:14,047 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:15:14,047 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:15:14,050 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:15:14,051 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:15:12" (1/3) ... [2023-11-12 00:15:14,051 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@255e5a03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:15:14, skipping insertion in model container [2023-11-12 00:15:14,051 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:15:12" (2/3) ... [2023-11-12 00:15:14,052 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@255e5a03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:15:14, skipping insertion in model container [2023-11-12 00:15:14,052 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:15:14" (3/3) ... [2023-11-12 00:15:14,054 INFO L112 eAbstractionObserver]: Analyzing ICFG toy.cil.c [2023-11-12 00:15:14,074 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:15:14,074 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:15:14,134 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:15:14,140 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;@7aca5928, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:15:14,141 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:15:14,145 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 41 states have (on average 1.6829268292682926) internal successors, (69), 42 states have internal predecessors, (69), 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 00:15:14,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 00:15:14,151 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:14,152 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:14,152 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:14,157 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:14,157 INFO L85 PathProgramCache]: Analyzing trace with hash 834619297, now seen corresponding path program 1 times [2023-11-12 00:15:14,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:14,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758683479] [2023-11-12 00:15:14,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:14,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:14,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:14,481 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 00:15:14,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:14,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758683479] [2023-11-12 00:15:14,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758683479] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:15:14,483 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:15:14,483 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:15:14,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502055163] [2023-11-12 00:15:14,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:15:14,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:15:14,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:15:14,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:15:14,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:15:14,538 INFO L87 Difference]: Start difference. First operand has 43 states, 41 states have (on average 1.6829268292682926) internal successors, (69), 42 states have internal predecessors, (69), 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 4.666666666666667) internal successors, (14), 2 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 00:15:14,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:15:14,703 INFO L93 Difference]: Finished difference Result 111 states and 179 transitions. [2023-11-12 00:15:14,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:15:14,705 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 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 14 [2023-11-12 00:15:14,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:15:14,716 INFO L225 Difference]: With dead ends: 111 [2023-11-12 00:15:14,717 INFO L226 Difference]: Without dead ends: 66 [2023-11-12 00:15:14,720 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 00:15:14,725 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 35 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:15:14,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 85 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:15:14,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-12 00:15:14,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2023-11-12 00:15:14,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.546875) internal successors, (99), 64 states have internal predecessors, (99), 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 00:15:14,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 99 transitions. [2023-11-12 00:15:14,780 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 99 transitions. Word has length 14 [2023-11-12 00:15:14,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:15:14,781 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 99 transitions. [2023-11-12 00:15:14,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 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 00:15:14,782 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 99 transitions. [2023-11-12 00:15:14,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-12 00:15:14,784 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:14,784 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:14,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:15:14,785 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:14,786 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:14,786 INFO L85 PathProgramCache]: Analyzing trace with hash 1145011454, now seen corresponding path program 1 times [2023-11-12 00:15:14,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:14,787 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561900166] [2023-11-12 00:15:14,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:14,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:14,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:15,153 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:15:15,154 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:15,154 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561900166] [2023-11-12 00:15:15,154 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561900166] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:15:15,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887059954] [2023-11-12 00:15:15,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:15,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:15:15,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:15:15,162 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:15:15,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:15:15,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:15,264 INFO L262 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:15:15,269 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:15:15,297 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:15:15,297 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:15:15,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887059954] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:15:15,298 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:15:15,298 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2023-11-12 00:15:15,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345112207] [2023-11-12 00:15:15,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:15:15,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:15:15,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:15:15,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:15:15,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:15:15,301 INFO L87 Difference]: Start difference. First operand 65 states and 99 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:15:15,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:15:15,412 INFO L93 Difference]: Finished difference Result 131 states and 204 transitions. [2023-11-12 00:15:15,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:15:15,412 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-12 00:15:15,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:15:15,416 INFO L225 Difference]: With dead ends: 131 [2023-11-12 00:15:15,416 INFO L226 Difference]: Without dead ends: 95 [2023-11-12 00:15:15,417 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:15:15,419 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 44 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:15:15,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 73 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:15:15,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-11-12 00:15:15,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2023-11-12 00:15:15,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.5604395604395604) internal successors, (142), 91 states have internal predecessors, (142), 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 00:15:15,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 142 transitions. [2023-11-12 00:15:15,442 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 142 transitions. Word has length 23 [2023-11-12 00:15:15,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:15:15,442 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 142 transitions. [2023-11-12 00:15:15,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:15:15,443 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 142 transitions. [2023-11-12 00:15:15,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-12 00:15:15,444 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:15,445 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:15,455 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-12 00:15:15,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-12 00:15:15,650 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:15,652 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:15,652 INFO L85 PathProgramCache]: Analyzing trace with hash 2128652111, now seen corresponding path program 1 times [2023-11-12 00:15:15,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:15,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102570592] [2023-11-12 00:15:15,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:15,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:15,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:15,990 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 00:15:15,991 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:15,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102570592] [2023-11-12 00:15:15,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1102570592] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:15:15,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678329046] [2023-11-12 00:15:15,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:15,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:15:15,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:15:16,003 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:15:16,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:15:16,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:16,126 INFO L262 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:15:16,130 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:15:16,159 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 00:15:16,160 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:15:16,161 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678329046] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:15:16,162 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:15:16,162 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2023-11-12 00:15:16,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822884711] [2023-11-12 00:15:16,169 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:15:16,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:15:16,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:15:16,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:15:16,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:15:16,173 INFO L87 Difference]: Start difference. First operand 92 states and 142 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:15:16,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:15:16,262 INFO L93 Difference]: Finished difference Result 187 states and 296 transitions. [2023-11-12 00:15:16,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:15:16,263 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2023-11-12 00:15:16,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:15:16,265 INFO L225 Difference]: With dead ends: 187 [2023-11-12 00:15:16,265 INFO L226 Difference]: Without dead ends: 124 [2023-11-12 00:15:16,266 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:15:16,267 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 20 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:15:16,268 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 102 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:15:16,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-11-12 00:15:16,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 112. [2023-11-12 00:15:16,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.5675675675675675) internal successors, (174), 111 states have internal predecessors, (174), 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 00:15:16,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 174 transitions. [2023-11-12 00:15:16,280 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 174 transitions. Word has length 34 [2023-11-12 00:15:16,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:15:16,280 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 174 transitions. [2023-11-12 00:15:16,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:15:16,281 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 174 transitions. [2023-11-12 00:15:16,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-12 00:15:16,283 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:16,283 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:16,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:15:16,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-12 00:15:16,490 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:16,490 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:16,490 INFO L85 PathProgramCache]: Analyzing trace with hash -2064882565, now seen corresponding path program 1 times [2023-11-12 00:15:16,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:16,491 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628444787] [2023-11-12 00:15:16,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:16,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:16,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:16,588 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-12 00:15:16,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:16,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628444787] [2023-11-12 00:15:16,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628444787] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:15:16,589 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:15:16,590 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:15:16,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784992268] [2023-11-12 00:15:16,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:15:16,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:15:16,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:15:16,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:15:16,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:15:16,592 INFO L87 Difference]: Start difference. First operand 112 states and 174 transitions. Second operand has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 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 00:15:16,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:15:16,652 INFO L93 Difference]: Finished difference Result 248 states and 391 transitions. [2023-11-12 00:15:16,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:15:16,653 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 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 42 [2023-11-12 00:15:16,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:15:16,654 INFO L225 Difference]: With dead ends: 248 [2023-11-12 00:15:16,655 INFO L226 Difference]: Without dead ends: 165 [2023-11-12 00:15:16,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:15:16,657 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 33 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:15:16,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 114 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:15:16,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2023-11-12 00:15:16,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 160. [2023-11-12 00:15:16,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 1.5974842767295598) internal successors, (254), 159 states have internal predecessors, (254), 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 00:15:16,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 254 transitions. [2023-11-12 00:15:16,673 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 254 transitions. Word has length 42 [2023-11-12 00:15:16,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:15:16,673 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 254 transitions. [2023-11-12 00:15:16,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 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 00:15:16,674 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 254 transitions. [2023-11-12 00:15:16,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-12 00:15:16,676 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:16,676 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:16,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:15:16,677 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:16,677 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:16,677 INFO L85 PathProgramCache]: Analyzing trace with hash 311960591, now seen corresponding path program 1 times [2023-11-12 00:15:16,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:16,678 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815492493] [2023-11-12 00:15:16,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:16,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:16,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:16,738 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-12 00:15:16,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:16,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815492493] [2023-11-12 00:15:16,739 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815492493] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:15:16,739 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:15:16,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:15:16,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843118964] [2023-11-12 00:15:16,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:15:16,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:15:16,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:15:16,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:15:16,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:15:16,741 INFO L87 Difference]: Start difference. First operand 160 states and 254 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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 00:15:16,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:15:16,812 INFO L93 Difference]: Finished difference Result 295 states and 472 transitions. [2023-11-12 00:15:16,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:15:16,813 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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 42 [2023-11-12 00:15:16,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:15:16,814 INFO L225 Difference]: With dead ends: 295 [2023-11-12 00:15:16,814 INFO L226 Difference]: Without dead ends: 164 [2023-11-12 00:15:16,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:15:16,817 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 41 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:15:16,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 106 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:15:16,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2023-11-12 00:15:16,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 162. [2023-11-12 00:15:16,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.5590062111801242) internal successors, (251), 161 states have internal predecessors, (251), 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 00:15:16,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 251 transitions. [2023-11-12 00:15:16,830 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 251 transitions. Word has length 42 [2023-11-12 00:15:16,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:15:16,830 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 251 transitions. [2023-11-12 00:15:16,830 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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 00:15:16,830 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 251 transitions. [2023-11-12 00:15:16,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-12 00:15:16,832 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:16,833 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:16,833 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 00:15:16,833 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:16,833 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:16,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1919015068, now seen corresponding path program 1 times [2023-11-12 00:15:16,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:16,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657206991] [2023-11-12 00:15:16,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:16,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:16,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:16,932 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:15:16,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:16,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657206991] [2023-11-12 00:15:16,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657206991] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:15:16,933 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:15:16,933 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:15:16,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803468716] [2023-11-12 00:15:16,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:15:16,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:15:16,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:15:16,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:15:16,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:15:16,935 INFO L87 Difference]: Start difference. First operand 162 states and 251 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:15:16,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:15:16,989 INFO L93 Difference]: Finished difference Result 375 states and 576 transitions. [2023-11-12 00:15:16,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:15:16,990 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2023-11-12 00:15:16,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:15:16,991 INFO L225 Difference]: With dead ends: 375 [2023-11-12 00:15:16,992 INFO L226 Difference]: Without dead ends: 217 [2023-11-12 00:15:16,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:15:16,993 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 28 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:15:16,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 111 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:15:16,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2023-11-12 00:15:17,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 174. [2023-11-12 00:15:17,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 173 states have (on average 1.5144508670520231) internal successors, (262), 173 states have internal predecessors, (262), 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 00:15:17,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 262 transitions. [2023-11-12 00:15:17,007 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 262 transitions. Word has length 43 [2023-11-12 00:15:17,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:15:17,007 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 262 transitions. [2023-11-12 00:15:17,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:15:17,008 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 262 transitions. [2023-11-12 00:15:17,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-12 00:15:17,010 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:17,010 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:17,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:15:17,010 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:17,011 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:17,011 INFO L85 PathProgramCache]: Analyzing trace with hash 1052791593, now seen corresponding path program 1 times [2023-11-12 00:15:17,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:17,011 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875059339] [2023-11-12 00:15:17,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:17,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:17,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:17,810 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 13 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:15:17,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:17,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875059339] [2023-11-12 00:15:17,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875059339] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:15:17,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528653524] [2023-11-12 00:15:17,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:17,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:15:17,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:15:17,815 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:15:17,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:15:17,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:17,958 INFO L262 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 42 conjunts are in the unsatisfiable core [2023-11-12 00:15:17,965 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:15:19,371 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 13 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:15:19,371 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:15:22,242 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:15:22,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528653524] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:15:22,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1437635044] [2023-11-12 00:15:22,263 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2023-11-12 00:15:22,264 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:15:22,267 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:15:22,273 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:15:22,273 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:15:29,818 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:15:35,350 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2839#(and (<= 0 (+ |ULTIMATE.start_eval_~tmp~0#1| 2147483648)) (not (= ~d~0 (+ |ULTIMATE.start_write_loop_~t~0#1| 1))) (<= |ULTIMATE.start_eval_~tmp~0#1| 2147483647) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~wl_st~0 1) (= ~t_b~0 |ULTIMATE.start_write_loop_~t~0#1|) (= 2 ~wl_pc~0) (not (= ~d~0 (+ 2 |ULTIMATE.start_write_loop_~t~0#1|))))' at error location [2023-11-12 00:15:35,351 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:15:35,351 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:15:35,351 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 13] total 25 [2023-11-12 00:15:35,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667249064] [2023-11-12 00:15:35,351 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:15:35,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-12 00:15:35,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:15:35,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-12 00:15:35,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2496, Unknown=0, NotChecked=0, Total=2862 [2023-11-12 00:15:35,355 INFO L87 Difference]: Start difference. First operand 174 states and 262 transitions. Second operand has 26 states, 26 states have (on average 4.653846153846154) internal successors, (121), 25 states have internal predecessors, (121), 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 00:15:39,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:15:39,540 INFO L93 Difference]: Finished difference Result 1497 states and 2175 transitions. [2023-11-12 00:15:39,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2023-11-12 00:15:39,541 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.653846153846154) internal successors, (121), 25 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2023-11-12 00:15:39,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:15:39,549 INFO L225 Difference]: With dead ends: 1497 [2023-11-12 00:15:39,549 INFO L226 Difference]: Without dead ends: 1316 [2023-11-12 00:15:39,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7584 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=2525, Invalid=16107, Unknown=0, NotChecked=0, Total=18632 [2023-11-12 00:15:39,560 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 1920 mSDsluCounter, 1717 mSDsCounter, 0 mSdLazyCounter, 1137 mSolverCounterSat, 265 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1920 SdHoareTripleChecker+Valid, 1853 SdHoareTripleChecker+Invalid, 1402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 265 IncrementalHoareTripleChecker+Valid, 1137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:15:39,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1920 Valid, 1853 Invalid, 1402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [265 Valid, 1137 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-11-12 00:15:39,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1316 states. [2023-11-12 00:15:39,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1316 to 464. [2023-11-12 00:15:39,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 1.5140388768898487) internal successors, (701), 463 states have internal predecessors, (701), 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 00:15:39,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 701 transitions. [2023-11-12 00:15:39,603 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 701 transitions. Word has length 50 [2023-11-12 00:15:39,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:15:39,604 INFO L495 AbstractCegarLoop]: Abstraction has 464 states and 701 transitions. [2023-11-12 00:15:39,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.653846153846154) internal successors, (121), 25 states have internal predecessors, (121), 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 00:15:39,605 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 701 transitions. [2023-11-12 00:15:39,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-11-12 00:15:39,614 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:39,615 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:39,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:15:39,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:15:39,827 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:39,828 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:39,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1316296641, now seen corresponding path program 1 times [2023-11-12 00:15:39,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:39,828 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388811372] [2023-11-12 00:15:39,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:39,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:39,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:40,520 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:15:40,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:40,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388811372] [2023-11-12 00:15:40,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388811372] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:15:40,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105792986] [2023-11-12 00:15:40,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:40,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:15:40,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:15:40,523 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:15:40,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:15:40,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:40,636 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-12 00:15:40,639 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:15:40,776 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 32 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:15:40,776 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:15:41,107 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 31 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:15:41,107 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105792986] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:15:41,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [687273490] [2023-11-12 00:15:41,110 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2023-11-12 00:15:41,110 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:15:41,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:15:41,111 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:15:41,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:15:49,697 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:15:51,976 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5554#(and (<= 0 (+ |ULTIMATE.start_eval_~tmp~0#1| 2147483648)) (not (= ~d~0 (+ |ULTIMATE.start_write_loop_~t~0#1| 1))) (<= |ULTIMATE.start_eval_~tmp~0#1| 2147483647) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~wl_st~0 1) (= ~t_b~0 |ULTIMATE.start_write_loop_~t~0#1|) (= 2 ~wl_pc~0) (not (= ~d~0 (+ 2 |ULTIMATE.start_write_loop_~t~0#1|))))' at error location [2023-11-12 00:15:51,977 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:15:51,977 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:15:51,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 9] total 18 [2023-11-12 00:15:51,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605242997] [2023-11-12 00:15:51,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:15:51,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-12 00:15:51,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:15:51,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-12 00:15:51,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1452, Unknown=0, NotChecked=0, Total=1722 [2023-11-12 00:15:51,981 INFO L87 Difference]: Start difference. First operand 464 states and 701 transitions. Second operand has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 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 00:15:52,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:15:52,745 INFO L93 Difference]: Finished difference Result 1004 states and 1503 transitions. [2023-11-12 00:15:52,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-12 00:15:52,746 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 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 58 [2023-11-12 00:15:52,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:15:52,751 INFO L225 Difference]: With dead ends: 1004 [2023-11-12 00:15:52,751 INFO L226 Difference]: Without dead ends: 481 [2023-11-12 00:15:52,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1241 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=525, Invalid=2897, Unknown=0, NotChecked=0, Total=3422 [2023-11-12 00:15:52,754 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 637 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 637 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:15:52,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [637 Valid, 332 Invalid, 548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:15:52,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2023-11-12 00:15:52,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 349. [2023-11-12 00:15:52,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.3563218390804597) internal successors, (472), 348 states have internal predecessors, (472), 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 00:15:52,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 472 transitions. [2023-11-12 00:15:52,781 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 472 transitions. Word has length 58 [2023-11-12 00:15:52,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:15:52,782 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 472 transitions. [2023-11-12 00:15:52,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 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 00:15:52,782 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 472 transitions. [2023-11-12 00:15:52,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-11-12 00:15:52,784 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:15:52,784 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:15:52,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:15:52,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-12 00:15:52,991 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:15:52,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:15:52,991 INFO L85 PathProgramCache]: Analyzing trace with hash 1937701285, now seen corresponding path program 1 times [2023-11-12 00:15:52,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:15:52,991 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731077928] [2023-11-12 00:15:52,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:52,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:15:53,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:56,200 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:15:56,200 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:15:56,200 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731077928] [2023-11-12 00:15:56,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731077928] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:15:56,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553728651] [2023-11-12 00:15:56,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:15:56,201 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:15:56,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:15:56,203 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:15:56,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f6bac810-9fec-46e2-a280-62723c4f5b06/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:15:56,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:15:56,346 INFO L262 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-12 00:15:56,361 INFO L285 TraceCheckSpWp]: Computing forward predicates...