/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain IntervalDomain -i ../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 00:16:45,420 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 00:16:45,422 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 00:16:45,452 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2023-04-01 00:16:45,465 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 00:16:45,467 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 00:16:45,468 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 00:16:45,469 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 00:16:45,469 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 00:16:45,470 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 00:16:45,471 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 00:16:45,474 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 00:16:45,475 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 00:16:45,476 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 00:16:45,477 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 00:16:45,478 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 00:16:45,484 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-01 00:16:45,489 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 00:16:45,490 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 00:16:45,490 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 00:16:45,491 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 00:16:45,514 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 00:16:45,515 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 00:16:45,515 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 00:16:45,515 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 00:16:45,516 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 00:16:45,516 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 00:16:45,516 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 00:16:45,516 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 00:16:45,516 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 00:16:45,516 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 00:16:45,517 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 00:16:45,517 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 00:16:45,517 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 00:16:45,517 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 00:16:45,517 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 00:16:45,517 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 00:16:45,517 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 00:16:45,517 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 00:16:45,518 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 00:16:45,518 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 00:16:45,519 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 00:16:45,519 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 00:16:45,519 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 00:16:45,520 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-04-01 00:16:45,697 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 00:16:45,712 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 00:16:45,713 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 00:16:45,714 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 00:16:45,714 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 00:16:45,715 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c [2023-04-01 00:16:46,719 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 00:16:46,920 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 00:16:46,920 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c [2023-04-01 00:16:46,930 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0e871978b/fabe97e840bb441bac5df125a99437b4/FLAG3fdf79d66 [2023-04-01 00:16:46,943 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0e871978b/fabe97e840bb441bac5df125a99437b4 [2023-04-01 00:16:46,945 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 00:16:46,946 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 00:16:46,949 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 00:16:46,949 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 00:16:46,951 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 00:16:46,952 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 12:16:46" (1/1) ... [2023-04-01 00:16:46,953 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7180db2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:46, skipping insertion in model container [2023-04-01 00:16:46,953 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 12:16:46" (1/1) ... [2023-04-01 00:16:46,957 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 00:16:46,993 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 00:16:47,166 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c[14371,14384] [2023-04-01 00:16:47,168 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 00:16:47,176 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 00:16:47,213 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c[14371,14384] [2023-04-01 00:16:47,213 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 00:16:47,225 INFO L208 MainTranslator]: Completed translation [2023-04-01 00:16:47,225 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47 WrapperNode [2023-04-01 00:16:47,225 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 00:16:47,233 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 00:16:47,233 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 00:16:47,233 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 00:16:47,242 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,242 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,249 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,249 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,258 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,268 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,269 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,272 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 00:16:47,273 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 00:16:47,273 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 00:16:47,273 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 00:16:47,274 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (1/1) ... [2023-04-01 00:16:47,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 00:16:47,287 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:16:47,307 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 00:16:47,309 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 00:16:47,343 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 00:16:47,343 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 00:16:47,343 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 00:16:47,344 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 00:16:47,344 INFO L138 BoogieDeclarations]: Found implementation of procedure node1 [2023-04-01 00:16:47,344 INFO L138 BoogieDeclarations]: Found implementation of procedure node2 [2023-04-01 00:16:47,344 INFO L138 BoogieDeclarations]: Found implementation of procedure node3 [2023-04-01 00:16:47,344 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2023-04-01 00:16:47,344 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2023-04-01 00:16:47,344 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 00:16:47,344 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2023-04-01 00:16:47,344 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 00:16:47,344 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure read [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure write [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure init [2023-04-01 00:16:47,345 INFO L130 BoogieDeclarations]: Found specification of procedure check [2023-04-01 00:16:47,346 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 00:16:47,346 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 00:16:47,346 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 00:16:47,346 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 00:16:47,346 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 00:16:47,346 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 00:16:47,346 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 00:16:47,512 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 00:16:47,513 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 00:16:47,931 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 00:16:48,327 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 00:16:48,327 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 00:16:48,329 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 12:16:48 BoogieIcfgContainer [2023-04-01 00:16:48,329 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 00:16:48,331 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 00:16:48,331 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 00:16:48,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 00:16:48,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 12:16:46" (1/3) ... [2023-04-01 00:16:48,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37a610b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 12:16:48, skipping insertion in model container [2023-04-01 00:16:48,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:16:47" (2/3) ... [2023-04-01 00:16:48,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37a610b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 12:16:48, skipping insertion in model container [2023-04-01 00:16:48,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 12:16:48" (3/3) ... [2023-04-01 00:16:48,335 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.ufo.BOUNDED-6.pals.c [2023-04-01 00:16:48,347 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 00:16:48,347 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 00:16:48,386 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 00:16:48,390 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@47e287b1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 00:16:48,391 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 00:16:48,394 INFO L276 IsEmpty]: Start isEmpty. Operand has 51 states, 31 states have (on average 1.4193548387096775) internal successors, (44), 32 states have internal predecessors, (44), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 00:16:48,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-04-01 00:16:48,400 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:16:48,401 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2023-04-01 00:16:48,401 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:16:48,407 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:16:48,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1901202102, now seen corresponding path program 1 times [2023-04-01 00:16:48,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:16:48,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255835081] [2023-04-01 00:16:48,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:16:48,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:16:48,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:16:51,339 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:16:51,339 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:16:51,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255835081] [2023-04-01 00:16:51,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255835081] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:16:51,340 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:16:51,340 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2023-04-01 00:16:51,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210879363] [2023-04-01 00:16:51,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:16:51,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 00:16:51,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:16:51,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 00:16:51,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2023-04-01 00:16:51,365 INFO L87 Difference]: Start difference. First operand has 51 states, 31 states have (on average 1.4193548387096775) internal successors, (44), 32 states have internal predecessors, (44), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 17 states, 9 states have (on average 2.0) internal successors, (18), 11 states have internal predecessors, (18), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 00:16:52,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:16:52,201 INFO L93 Difference]: Finished difference Result 123 states and 152 transitions. [2023-04-01 00:16:52,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-01 00:16:52,204 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 9 states have (on average 2.0) internal successors, (18), 11 states have internal predecessors, (18), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 34 [2023-04-01 00:16:52,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:16:52,211 INFO L225 Difference]: With dead ends: 123 [2023-04-01 00:16:52,211 INFO L226 Difference]: Without dead ends: 76 [2023-04-01 00:16:52,215 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2023-04-01 00:16:52,219 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 270 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 00:16:52,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 177 Invalid, 726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 647 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 00:16:52,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-04-01 00:16:52,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 64. [2023-04-01 00:16:52,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 39 states have internal predecessors, (49), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2023-04-01 00:16:52,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 75 transitions. [2023-04-01 00:16:52,267 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 75 transitions. Word has length 34 [2023-04-01 00:16:52,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:16:52,267 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 75 transitions. [2023-04-01 00:16:52,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 9 states have (on average 2.0) internal successors, (18), 11 states have internal predecessors, (18), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 00:16:52,268 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 75 transitions. [2023-04-01 00:16:52,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-01 00:16:52,269 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:16:52,269 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1] [2023-04-01 00:16:52,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 00:16:52,270 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:16:52,270 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:16:52,270 INFO L85 PathProgramCache]: Analyzing trace with hash -1112947322, now seen corresponding path program 1 times [2023-04-01 00:16:52,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:16:52,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054377109] [2023-04-01 00:16:52,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:16:52,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:16:52,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:16:53,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:16:53,483 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:16:53,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054377109] [2023-04-01 00:16:53,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054377109] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:16:53,483 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:16:53,483 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-04-01 00:16:53,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648597437] [2023-04-01 00:16:53,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:16:53,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 00:16:53,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:16:53,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 00:16:53,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-04-01 00:16:53,485 INFO L87 Difference]: Start difference. First operand 64 states and 75 transitions. Second operand has 11 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 00:16:53,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:16:53,814 INFO L93 Difference]: Finished difference Result 128 states and 153 transitions. [2023-04-01 00:16:53,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 00:16:53,814 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 35 [2023-04-01 00:16:53,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:16:53,815 INFO L225 Difference]: With dead ends: 128 [2023-04-01 00:16:53,815 INFO L226 Difference]: Without dead ends: 91 [2023-04-01 00:16:53,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2023-04-01 00:16:53,817 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 135 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 00:16:53,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 97 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 00:16:53,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-04-01 00:16:53,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 65. [2023-04-01 00:16:53,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 40 states have internal predecessors, (50), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2023-04-01 00:16:53,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 76 transitions. [2023-04-01 00:16:53,829 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 76 transitions. Word has length 35 [2023-04-01 00:16:53,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:16:53,829 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 76 transitions. [2023-04-01 00:16:53,830 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 00:16:53,830 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 76 transitions. [2023-04-01 00:16:53,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-01 00:16:53,830 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:16:53,830 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:16:53,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 00:16:53,831 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:16:53,831 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:16:53,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1340141517, now seen corresponding path program 1 times [2023-04-01 00:16:53,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:16:53,831 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92285515] [2023-04-01 00:16:53,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:16:53,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:16:53,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:16:54,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:16:54,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:16:54,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92285515] [2023-04-01 00:16:54,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92285515] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:16:54,947 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:16:54,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-04-01 00:16:54,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346691049] [2023-04-01 00:16:54,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:16:54,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 00:16:54,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:16:54,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 00:16:54,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-04-01 00:16:54,949 INFO L87 Difference]: Start difference. First operand 65 states and 76 transitions. Second operand has 11 states, 7 states have (on average 2.857142857142857) internal successors, (20), 9 states have internal predecessors, (20), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 00:16:55,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:16:55,344 INFO L93 Difference]: Finished difference Result 135 states and 160 transitions. [2023-04-01 00:16:55,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 00:16:55,345 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 7 states have (on average 2.857142857142857) internal successors, (20), 9 states have internal predecessors, (20), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 36 [2023-04-01 00:16:55,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:16:55,346 INFO L225 Difference]: With dead ends: 135 [2023-04-01 00:16:55,346 INFO L226 Difference]: Without dead ends: 98 [2023-04-01 00:16:55,346 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2023-04-01 00:16:55,347 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 97 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 00:16:55,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 116 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 00:16:55,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-04-01 00:16:55,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 66. [2023-04-01 00:16:55,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 40 states have (on average 1.275) internal successors, (51), 41 states have internal predecessors, (51), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2023-04-01 00:16:55,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 77 transitions. [2023-04-01 00:16:55,365 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 77 transitions. Word has length 36 [2023-04-01 00:16:55,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:16:55,365 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 77 transitions. [2023-04-01 00:16:55,365 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 7 states have (on average 2.857142857142857) internal successors, (20), 9 states have internal predecessors, (20), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 00:16:55,365 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 77 transitions. [2023-04-01 00:16:55,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 00:16:55,367 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:16:55,368 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:16:55,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 00:16:55,368 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:16:55,368 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:16:55,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1313484431, now seen corresponding path program 1 times [2023-04-01 00:16:55,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:16:55,369 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355637157] [2023-04-01 00:16:55,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:16:55,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:16:55,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:16:56,388 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:16:56,389 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:16:56,389 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355637157] [2023-04-01 00:16:56,389 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355637157] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:16:56,389 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:16:56,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-04-01 00:16:56,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12623525] [2023-04-01 00:16:56,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:16:56,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 00:16:56,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:16:56,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 00:16:56,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-04-01 00:16:56,391 INFO L87 Difference]: Start difference. First operand 66 states and 77 transitions. Second operand has 11 states, 7 states have (on average 3.0) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 00:16:56,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:16:56,748 INFO L93 Difference]: Finished difference Result 142 states and 167 transitions. [2023-04-01 00:16:56,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 00:16:56,748 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 7 states have (on average 3.0) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 37 [2023-04-01 00:16:56,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:16:56,749 INFO L225 Difference]: With dead ends: 142 [2023-04-01 00:16:56,749 INFO L226 Difference]: Without dead ends: 105 [2023-04-01 00:16:56,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2023-04-01 00:16:56,752 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 104 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 00:16:56,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 109 Invalid, 475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 447 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 00:16:56,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-04-01 00:16:56,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 67. [2023-04-01 00:16:56,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 41 states have (on average 1.2682926829268293) internal successors, (52), 42 states have internal predecessors, (52), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2023-04-01 00:16:56,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2023-04-01 00:16:56,775 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 37 [2023-04-01 00:16:56,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:16:56,776 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2023-04-01 00:16:56,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 7 states have (on average 3.0) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 00:16:56,776 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2023-04-01 00:16:56,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 00:16:56,778 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:16:56,778 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:16:56,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 00:16:56,778 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:16:56,778 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:16:56,778 INFO L85 PathProgramCache]: Analyzing trace with hash 375765047, now seen corresponding path program 1 times [2023-04-01 00:16:56,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:16:56,779 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445926004] [2023-04-01 00:16:56,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:16:56,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:16:56,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:16:58,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:16:58,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:16:58,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445926004] [2023-04-01 00:16:58,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445926004] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:16:58,191 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:16:58,191 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2023-04-01 00:16:58,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353676044] [2023-04-01 00:16:58,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:16:58,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-01 00:16:58,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:16:58,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-01 00:16:58,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2023-04-01 00:16:58,198 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 18 states, 10 states have (on average 2.3) internal successors, (23), 12 states have internal predecessors, (23), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 00:16:59,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:16:59,308 INFO L93 Difference]: Finished difference Result 209 states and 249 transitions. [2023-04-01 00:16:59,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-01 00:16:59,308 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 10 states have (on average 2.3) internal successors, (23), 12 states have internal predecessors, (23), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 39 [2023-04-01 00:16:59,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:16:59,309 INFO L225 Difference]: With dead ends: 209 [2023-04-01 00:16:59,310 INFO L226 Difference]: Without dead ends: 172 [2023-04-01 00:16:59,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=370, Invalid=1270, Unknown=0, NotChecked=0, Total=1640 [2023-04-01 00:16:59,311 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 483 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 897 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 488 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 1030 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 897 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-01 00:16:59,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [488 Valid, 224 Invalid, 1030 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 897 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-01 00:16:59,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2023-04-01 00:16:59,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 81. [2023-04-01 00:16:59,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 54 states have (on average 1.3518518518518519) internal successors, (73), 56 states have internal predecessors, (73), 13 states have call successors, (13), 13 states have call predecessors, (13), 13 states have return successors, (14), 11 states have call predecessors, (14), 12 states have call successors, (14) [2023-04-01 00:16:59,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions. [2023-04-01 00:16:59,345 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 39 [2023-04-01 00:16:59,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:16:59,345 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 100 transitions. [2023-04-01 00:16:59,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 10 states have (on average 2.3) internal successors, (23), 12 states have internal predecessors, (23), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 00:16:59,346 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions. [2023-04-01 00:16:59,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 00:16:59,346 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:16:59,346 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:16:59,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-04-01 00:16:59,347 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:16:59,347 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:16:59,347 INFO L85 PathProgramCache]: Analyzing trace with hash -1423667030, now seen corresponding path program 1 times [2023-04-01 00:16:59,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:16:59,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120010932] [2023-04-01 00:16:59,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:16:59,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:16:59,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:16:59,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:16:59,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:16:59,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120010932] [2023-04-01 00:16:59,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120010932] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:16:59,997 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:16:59,997 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-04-01 00:16:59,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337058146] [2023-04-01 00:16:59,997 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:16:59,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 00:16:59,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:16:59,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 00:16:59,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2023-04-01 00:16:59,998 INFO L87 Difference]: Start difference. First operand 81 states and 100 transitions. Second operand has 11 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 9 states have internal predecessors, (24), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 00:17:00,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:17:00,274 INFO L93 Difference]: Finished difference Result 149 states and 185 transitions. [2023-04-01 00:17:00,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 00:17:00,275 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 9 states have internal predecessors, (24), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 40 [2023-04-01 00:17:00,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:17:00,276 INFO L225 Difference]: With dead ends: 149 [2023-04-01 00:17:00,276 INFO L226 Difference]: Without dead ends: 100 [2023-04-01 00:17:00,276 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2023-04-01 00:17:00,277 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 139 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 396 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 396 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 00:17:00,277 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 96 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 396 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 00:17:00,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-04-01 00:17:00,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 72. [2023-04-01 00:17:00,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 47 states have internal predecessors, (55), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2023-04-01 00:17:00,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 81 transitions. [2023-04-01 00:17:00,310 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 81 transitions. Word has length 40 [2023-04-01 00:17:00,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:17:00,310 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 81 transitions. [2023-04-01 00:17:00,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 9 states have internal predecessors, (24), 5 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-01 00:17:00,310 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 81 transitions. [2023-04-01 00:17:00,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-01 00:17:00,312 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:17:00,312 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:17:00,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-04-01 00:17:00,312 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:17:00,313 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:17:00,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1659490000, now seen corresponding path program 1 times [2023-04-01 00:17:00,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:17:00,313 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218285051] [2023-04-01 00:17:00,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:17:00,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:17:00,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:17:01,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:17:01,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:17:01,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218285051] [2023-04-01 00:17:01,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [218285051] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:17:01,783 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:17:01,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2023-04-01 00:17:01,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564356809] [2023-04-01 00:17:01,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:17:01,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-01 00:17:01,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:17:01,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-01 00:17:01,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2023-04-01 00:17:01,785 INFO L87 Difference]: Start difference. First operand 72 states and 81 transitions. Second operand has 18 states, 10 states have (on average 2.6) internal successors, (26), 12 states have internal predecessors, (26), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 00:17:02,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:17:02,514 INFO L93 Difference]: Finished difference Result 158 states and 180 transitions. [2023-04-01 00:17:02,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-04-01 00:17:02,515 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 10 states have (on average 2.6) internal successors, (26), 12 states have internal predecessors, (26), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 42 [2023-04-01 00:17:02,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:17:02,516 INFO L225 Difference]: With dead ends: 158 [2023-04-01 00:17:02,516 INFO L226 Difference]: Without dead ends: 118 [2023-04-01 00:17:02,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=320, Invalid=1086, Unknown=0, NotChecked=0, Total=1406 [2023-04-01 00:17:02,517 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 268 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 594 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 00:17:02,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [271 Valid, 159 Invalid, 687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 594 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 00:17:02,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2023-04-01 00:17:02,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 75. [2023-04-01 00:17:02,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 49 states have (on average 1.183673469387755) internal successors, (58), 50 states have internal predecessors, (58), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2023-04-01 00:17:02,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 84 transitions. [2023-04-01 00:17:02,567 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 84 transitions. Word has length 42 [2023-04-01 00:17:02,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:17:02,568 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 84 transitions. [2023-04-01 00:17:02,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 10 states have (on average 2.6) internal successors, (26), 12 states have internal predecessors, (26), 7 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2023-04-01 00:17:02,568 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 84 transitions. [2023-04-01 00:17:02,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-04-01 00:17:02,568 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:17:02,568 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:17:02,568 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-04-01 00:17:02,568 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:17:02,569 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:17:02,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1865376330, now seen corresponding path program 1 times [2023-04-01 00:17:02,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:17:02,569 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256765318] [2023-04-01 00:17:02,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:17:02,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:17:02,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:17:03,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:17:03,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:17:03,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256765318] [2023-04-01 00:17:03,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256765318] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 00:17:03,352 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 00:17:03,353 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2023-04-01 00:17:03,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197936797] [2023-04-01 00:17:03,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 00:17:03,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 00:17:03,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 00:17:03,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 00:17:03,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2023-04-01 00:17:03,354 INFO L87 Difference]: Start difference. First operand 75 states and 84 transitions. Second operand has 13 states, 8 states have (on average 3.375) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-01 00:17:03,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 00:17:03,584 INFO L93 Difference]: Finished difference Result 110 states and 127 transitions. [2023-04-01 00:17:03,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-01 00:17:03,584 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 3.375) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) Word has length 43 [2023-04-01 00:17:03,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 00:17:03,587 INFO L225 Difference]: With dead ends: 110 [2023-04-01 00:17:03,587 INFO L226 Difference]: Without dead ends: 108 [2023-04-01 00:17:03,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2023-04-01 00:17:03,589 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 40 mSDsluCounter, 555 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 611 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 00:17:03,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 611 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 00:17:03,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-04-01 00:17:03,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 81. [2023-04-01 00:17:03,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 53 states have (on average 1.169811320754717) internal successors, (62), 54 states have internal predecessors, (62), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (14), 12 states have call predecessors, (14), 13 states have call successors, (14) [2023-04-01 00:17:03,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 90 transitions. [2023-04-01 00:17:03,620 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 90 transitions. Word has length 43 [2023-04-01 00:17:03,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 00:17:03,621 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 90 transitions. [2023-04-01 00:17:03,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 3.375) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2023-04-01 00:17:03,621 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 90 transitions. [2023-04-01 00:17:03,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-04-01 00:17:03,624 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 00:17:03,624 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 00:17:03,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-04-01 00:17:03,624 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 00:17:03,624 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 00:17:03,624 INFO L85 PathProgramCache]: Analyzing trace with hash -557968203, now seen corresponding path program 1 times [2023-04-01 00:17:03,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 00:17:03,625 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206112397] [2023-04-01 00:17:03,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:17:03,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 00:17:03,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:17:06,335 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 00:17:06,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 00:17:06,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206112397] [2023-04-01 00:17:06,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206112397] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 00:17:06,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086567451] [2023-04-01 00:17:06,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 00:17:06,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 00:17:06,336 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 00:17:06,345 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 00:17:06,348 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 00:17:06,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 00:17:06,553 INFO L262 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 105 conjunts are in the unsatisfiable core [2023-04-01 00:17:06,565 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 00:17:17,573 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 00:17:17,573 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 00:17:18,109 WARN L176 XnfTransformerHelper]: Simplifying conjuction of 7864 disjunctions. This might take some time... [2023-04-01 00:17:21,130 INFO L192 XnfTransformerHelper]: Simplified to conjuction of 7864 disjunctions.