/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 OctagonDomain -i ../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:24:37,735 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:24:37,737 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:24:37,762 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:24:37,763 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:24:37,763 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:24:37,764 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:24:37,769 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:24:37,770 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:24:37,773 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:24:37,774 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:24:37,775 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:24:37,775 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:24:37,778 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:24:37,779 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:24:37,779 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:24:37,780 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:24:37,780 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:24:37,781 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:24:37,782 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:24:37,782 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:24:37,783 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:24:37,783 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:24:37,784 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:24:37,786 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 22:24:37,787 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:24:37,787 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:24:37,788 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:24:37,788 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:24:37,789 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:24:37,789 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:24:37,789 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:24:37,789 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:24:37,790 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:24:37,790 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:24:37,790 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:24:37,791 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 [2023-04-02 22:24:37,803 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:24:37,803 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:24:37,804 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:24:37,804 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:24:37,804 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:24:37,804 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:24:37,804 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:24:37,804 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:24:37,805 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:24:37,805 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:24:37,806 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:24:37,806 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:24:37,806 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:24:37,806 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:24:37,806 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:24:37,806 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:24:37,806 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:24:37,806 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:24:37,806 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:24:37,807 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:24:37,807 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:24:37,807 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:24:37,807 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:24:37,807 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:24:37,807 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:24:37,807 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:24:37,807 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:24:37,807 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:24:37,807 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:24:37,808 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:24:37,808 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:24:37,808 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:24:37,808 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:24:37,808 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:24:37,967 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:24:37,986 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:24:37,988 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:24:37,989 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:24:37,990 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:24:37,991 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2023-04-02 22:24:38,935 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:24:39,061 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:24:39,062 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2023-04-02 22:24:39,066 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7345a8b25/201fe32020784258abef909ae5d124bd/FLAG5fdbe09de [2023-04-02 22:24:39,078 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7345a8b25/201fe32020784258abef909ae5d124bd [2023-04-02 22:24:39,080 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:24:39,080 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:24:39,082 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:24:39,082 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:24:39,084 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:24:39,085 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,086 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@bdfddb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39, skipping insertion in model container [2023-04-02 22:24:39,086 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,091 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:24:39,101 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:24:39,185 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/loops-crafted-1/nested_delay_nd.c[465,478] [2023-04-02 22:24:39,193 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:24:39,199 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:24:39,206 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/loops-crafted-1/nested_delay_nd.c[465,478] [2023-04-02 22:24:39,211 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:24:39,219 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:24:39,219 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39 WrapperNode [2023-04-02 22:24:39,219 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:24:39,220 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:24:39,220 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:24:39,220 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:24:39,227 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,228 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,231 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,231 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,234 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,236 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,236 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,237 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,238 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:24:39,239 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:24:39,239 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:24:39,239 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:24:39,239 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (1/1) ... [2023-04-02 22:24:39,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:24:39,249 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:39,259 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) [2023-04-02 22:24:39,264 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 [2023-04-02 22:24:39,283 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:24:39,283 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:24:39,283 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:24:39,283 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 22:24:39,283 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:24:39,283 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:24:39,283 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:24:39,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:24:39,330 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:24:39,332 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:24:39,493 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:24:39,557 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:24:39,558 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 22:24:39,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:24:39 BoogieIcfgContainer [2023-04-02 22:24:39,559 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:24:39,561 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:24:39,561 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:24:39,563 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:24:39,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:24:39" (1/3) ... [2023-04-02 22:24:39,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@404055fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:24:39, skipping insertion in model container [2023-04-02 22:24:39,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:24:39" (2/3) ... [2023-04-02 22:24:39,564 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@404055fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:24:39, skipping insertion in model container [2023-04-02 22:24:39,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:24:39" (3/3) ... [2023-04-02 22:24:39,565 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2023-04-02 22:24:39,575 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:24:39,576 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:24:39,604 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:24:39,610 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;@2025d7d8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:24:39,610 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:24:39,613 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 22:24:39,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 22:24:39,619 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:24:39,620 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:24:39,620 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:24:39,625 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:24:39,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1065726219, now seen corresponding path program 1 times [2023-04-02 22:24:39,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:24:39,632 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013576539] [2023-04-02 22:24:39,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:39,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:39,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:39,876 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:39,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:39,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013576539] [2023-04-02 22:24:39,877 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013576539] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:24:39,878 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:24:39,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 22:24:39,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164208868] [2023-04-02 22:24:39,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:24:39,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 22:24:39,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:24:39,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 22:24:39,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:24:39,915 INFO L87 Difference]: Start difference. First operand has 21 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:24:39,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:24:39,950 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-04-02 22:24:39,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:24:39,952 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2023-04-02 22:24:39,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:24:39,956 INFO L225 Difference]: With dead ends: 32 [2023-04-02 22:24:39,956 INFO L226 Difference]: Without dead ends: 20 [2023-04-02 22:24:39,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:24:39,960 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 12 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:24:39,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 23 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:24:39,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-02 22:24:39,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2023-04-02 22:24:39,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:24:39,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-04-02 22:24:39,982 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2023-04-02 22:24:39,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:24:39,982 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-04-02 22:24:39,983 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:24:39,983 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-04-02 22:24:39,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-02 22:24:39,983 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:24:39,983 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:24:39,983 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:24:39,984 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:24:39,984 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:24:39,984 INFO L85 PathProgramCache]: Analyzing trace with hash 1059406511, now seen corresponding path program 1 times [2023-04-02 22:24:39,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:24:39,984 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147135046] [2023-04-02 22:24:39,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:39,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:40,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:40,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:40,120 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:40,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147135046] [2023-04-02 22:24:40,121 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147135046] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:24:40,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834718095] [2023-04-02 22:24:40,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:40,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:40,121 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:40,123 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) [2023-04-02 22:24:40,125 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 22:24:40,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:40,175 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 22:24:40,178 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:24:40,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:40,230 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:24:40,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:40,268 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834718095] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:24:40,268 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1139182014] [2023-04-02 22:24:40,299 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:24:40,300 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:24:40,303 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:24:40,307 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:24:40,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:24:40,403 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 16 for LOIs [2023-04-02 22:24:40,811 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 125 for LOIs [2023-04-02 22:24:40,821 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-04-02 22:24:40,825 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-02 22:24:40,835 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:24:41,228 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '209#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:24:41,228 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:24:41,228 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:24:41,228 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-04-02 22:24:41,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642690413] [2023-04-02 22:24:41,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:24:41,229 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-02 22:24:41,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:24:41,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-02 22:24:41,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2023-04-02 22:24:41,231 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-02 22:24:41,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:24:41,276 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2023-04-02 22:24:41,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 22:24:41,276 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 16 [2023-04-02 22:24:41,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:24:41,277 INFO L225 Difference]: With dead ends: 33 [2023-04-02 22:24:41,277 INFO L226 Difference]: Without dead ends: 23 [2023-04-02 22:24:41,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2023-04-02 22:24:41,278 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 22 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:24:41,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 30 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:24:41,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-04-02 22:24:41,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-04-02 22:24:41,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:24:41,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-04-02 22:24:41,284 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 16 [2023-04-02 22:24:41,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:24:41,284 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-04-02 22:24:41,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-02 22:24:41,285 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-04-02 22:24:41,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 22:24:41,285 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:24:41,285 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:24:41,295 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 22:24:41,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:41,490 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:24:41,490 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:24:41,491 INFO L85 PathProgramCache]: Analyzing trace with hash -1921618571, now seen corresponding path program 2 times [2023-04-02 22:24:41,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:24:41,491 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28466072] [2023-04-02 22:24:41,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:41,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:41,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:41,613 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:41,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:41,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28466072] [2023-04-02 22:24:41,615 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28466072] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:24:41,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282693514] [2023-04-02 22:24:41,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:24:41,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:41,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:41,616 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:24:41,618 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 22:24:41,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:24:41,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:24:41,661 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:24:41,663 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:24:41,727 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:41,727 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:24:41,803 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:41,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282693514] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:24:41,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [997401727] [2023-04-02 22:24:41,805 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:24:41,805 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:24:41,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:24:41,806 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:24:41,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:24:41,838 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 16 for LOIs [2023-04-02 22:24:42,043 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 125 for LOIs [2023-04-02 22:24:42,046 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-04-02 22:24:42,048 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-02 22:24:42,052 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:24:42,419 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '445#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:24:42,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:24:42,419 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:24:42,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2023-04-02 22:24:42,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867796511] [2023-04-02 22:24:42,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:24:42,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-02 22:24:42,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:24:42,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-02 22:24:42,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=772, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:24:42,421 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-02 22:24:42,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:24:42,554 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2023-04-02 22:24:42,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 22:24:42,554 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 19 [2023-04-02 22:24:42,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:24:42,555 INFO L225 Difference]: With dead ends: 42 [2023-04-02 22:24:42,555 INFO L226 Difference]: Without dead ends: 29 [2023-04-02 22:24:42,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=300, Invalid=1032, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 22:24:42,556 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 28 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:24:42,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 37 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:24:42,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-04-02 22:24:42,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2023-04-02 22:24:42,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.1) internal successors, (22), 21 states have internal predecessors, (22), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:24:42,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2023-04-02 22:24:42,560 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 19 [2023-04-02 22:24:42,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:24:42,560 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2023-04-02 22:24:42,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-02 22:24:42,560 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2023-04-02 22:24:42,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 22:24:42,561 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:24:42,561 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:24:42,569 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 22:24:42,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-02 22:24:42,768 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:24:42,768 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:24:42,768 INFO L85 PathProgramCache]: Analyzing trace with hash -1571650763, now seen corresponding path program 3 times [2023-04-02 22:24:42,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:24:42,768 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945006338] [2023-04-02 22:24:42,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:42,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:42,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:42,943 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:42,943 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:42,943 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945006338] [2023-04-02 22:24:42,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945006338] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:24:42,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842312430] [2023-04-02 22:24:42,945 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:24:42,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:42,945 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:42,946 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:24:42,950 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 22:24:42,986 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:24:42,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:24:42,987 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 40 conjunts are in the unsatisfiable core [2023-04-02 22:24:42,989 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:24:43,936 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 45 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:43,936 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:24:44,887 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 28 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:24:44,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842312430] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:24:44,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1079728795] [2023-04-02 22:24:44,889 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:24:44,889 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:24:44,889 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:24:44,889 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:24:44,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:24:44,904 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 16 for LOIs [2023-04-02 22:24:45,055 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 125 for LOIs [2023-04-02 22:24:45,058 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-04-02 22:24:45,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-02 22:24:45,063 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:24:45,690 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '778#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:24:45,691 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:24:45,691 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:24:45,691 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2023-04-02 22:24:45,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585608860] [2023-04-02 22:24:45,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:24:45,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-02 22:24:45,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:24:45,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-02 22:24:45,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=2776, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 22:24:45,695 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 44 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 42 states have internal predecessors, (51), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 22:24:47,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:24:47,380 INFO L93 Difference]: Finished difference Result 84 states and 95 transitions. [2023-04-02 22:24:47,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-04-02 22:24:47,381 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 42 states have internal predecessors, (51), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 25 [2023-04-02 22:24:47,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:24:47,382 INFO L225 Difference]: With dead ends: 84 [2023-04-02 22:24:47,382 INFO L226 Difference]: Without dead ends: 65 [2023-04-02 22:24:47,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2734 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1420, Invalid=8282, Unknown=0, NotChecked=0, Total=9702 [2023-04-02 22:24:47,385 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 74 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:24:47,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 128 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 22:24:47,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-04-02 22:24:47,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2023-04-02 22:24:47,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 52 states have internal predecessors, (56), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:24:47,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2023-04-02 22:24:47,396 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 25 [2023-04-02 22:24:47,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:24:47,397 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2023-04-02 22:24:47,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 42 states have internal predecessors, (51), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-02 22:24:47,397 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2023-04-02 22:24:47,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-04-02 22:24:47,398 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:24:47,398 INFO L195 NwaCegarLoop]: trace histogram [34, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:24:47,407 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 22:24:47,602 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:47,603 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:24:47,603 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:24:47,603 INFO L85 PathProgramCache]: Analyzing trace with hash -326581571, now seen corresponding path program 1 times [2023-04-02 22:24:47,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:24:47,603 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220028900] [2023-04-02 22:24:47,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:47,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:47,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:47,841 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 306 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-04-02 22:24:47,841 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:47,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220028900] [2023-04-02 22:24:47,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220028900] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:24:47,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203331968] [2023-04-02 22:24:47,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:47,842 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:47,842 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:47,843 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:24:47,844 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 22:24:47,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:47,911 INFO L262 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 22:24:47,914 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:24:48,054 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 302 proven. 66 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-02 22:24:48,054 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:24:48,276 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 306 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-04-02 22:24:48,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203331968] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:24:48,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1592906188] [2023-04-02 22:24:48,280 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:24:48,280 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:24:48,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:24:48,280 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:24:48,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:24:48,296 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 16 for LOIs [2023-04-02 22:24:48,583 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2023-04-02 22:24:48,592 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-04-02 22:24:48,594 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-02 22:24:48,597 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:24:48,845 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1555#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:24:48,845 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:24:48,845 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:24:48,846 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2023-04-02 22:24:48,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298731936] [2023-04-02 22:24:48,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:24:48,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-04-02 22:24:48,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:24:48,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-04-02 22:24:48,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=731, Invalid=2131, Unknown=0, NotChecked=0, Total=2862 [2023-04-02 22:24:48,850 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 40 states, 40 states have (on average 1.45) internal successors, (58), 40 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-02 22:24:49,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:24:49,155 INFO L93 Difference]: Finished difference Result 140 states and 187 transitions. [2023-04-02 22:24:49,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 22:24:49,156 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.45) internal successors, (58), 40 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 63 [2023-04-02 22:24:49,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:24:49,157 INFO L225 Difference]: With dead ends: 140 [2023-04-02 22:24:49,157 INFO L226 Difference]: Without dead ends: 100 [2023-04-02 22:24:49,158 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1845 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1079, Invalid=3211, Unknown=0, NotChecked=0, Total=4290 [2023-04-02 22:24:49,159 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 42 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:24:49,159 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 51 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:24:49,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-04-02 22:24:49,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-04-02 22:24:49,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 89 states have (on average 1.0449438202247192) internal successors, (93), 90 states have internal predecessors, (93), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:24:49,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2023-04-02 22:24:49,172 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 63 [2023-04-02 22:24:49,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:24:49,173 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2023-04-02 22:24:49,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.45) internal successors, (58), 40 states have internal predecessors, (58), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-02 22:24:49,173 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2023-04-02 22:24:49,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-04-02 22:24:49,175 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:24:49,175 INFO L195 NwaCegarLoop]: trace histogram [72, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:24:49,179 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 22:24:49,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:49,377 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:24:49,377 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:24:49,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1526004277, now seen corresponding path program 2 times [2023-04-02 22:24:49,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:24:49,378 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915764741] [2023-04-02 22:24:49,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:49,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:49,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:49,989 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 1256 proven. 300 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-04-02 22:24:49,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:49,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915764741] [2023-04-02 22:24:49,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915764741] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:24:49,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949506875] [2023-04-02 22:24:49,990 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:24:49,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:49,990 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:49,991 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:24:49,993 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 22:24:50,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-04-02 22:24:50,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:24:50,074 INFO L262 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 27 conjunts are in the unsatisfiable core [2023-04-02 22:24:50,077 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:24:50,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 1256 proven. 300 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-04-02 22:24:50,513 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:24:51,243 INFO L134 CoverageAnalysis]: Checked inductivity of 2789 backedges. 6 proven. 1550 refuted. 0 times theorem prover too weak. 1233 trivial. 0 not checked. [2023-04-02 22:24:51,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949506875] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:24:51,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [323714411] [2023-04-02 22:24:51,245 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:24:51,245 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:24:51,245 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:24:51,245 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:24:51,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:24:51,264 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 16 for LOIs [2023-04-02 22:24:51,570 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2023-04-02 22:24:51,579 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-04-02 22:24:51,581 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-02 22:24:51,584 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:24:51,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2725#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:24:51,924 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:24:51,924 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:24:51,924 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 79 [2023-04-02 22:24:51,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149556383] [2023-04-02 22:24:51,924 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:24:51,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2023-04-02 22:24:51,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:24:51,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2023-04-02 22:24:51,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2759, Invalid=5797, Unknown=0, NotChecked=0, Total=8556 [2023-04-02 22:24:51,927 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 79 states, 79 states have (on average 1.3164556962025316) internal successors, (104), 79 states have internal predecessors, (104), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-04-02 22:24:52,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:24:52,733 INFO L93 Difference]: Finished difference Result 243 states and 328 transitions. [2023-04-02 22:24:52,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-04-02 22:24:52,734 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.3164556962025316) internal successors, (104), 79 states have internal predecessors, (104), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 101 [2023-04-02 22:24:52,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:24:52,735 INFO L225 Difference]: With dead ends: 243 [2023-04-02 22:24:52,735 INFO L226 Difference]: Without dead ends: 178 [2023-04-02 22:24:52,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5732 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4134, Invalid=9672, Unknown=0, NotChecked=0, Total=13806 [2023-04-02 22:24:52,738 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 2 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:24:52,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 59 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:24:52,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2023-04-02 22:24:52,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2023-04-02 22:24:52,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 167 states have (on average 1.0239520958083832) internal successors, (171), 168 states have internal predecessors, (171), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:24:52,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 182 transitions. [2023-04-02 22:24:52,760 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 182 transitions. Word has length 101 [2023-04-02 22:24:52,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:24:52,760 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 182 transitions. [2023-04-02 22:24:52,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.3164556962025316) internal successors, (104), 79 states have internal predecessors, (104), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-04-02 22:24:52,760 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 182 transitions. [2023-04-02 22:24:52,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2023-04-02 22:24:52,763 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:24:52,763 INFO L195 NwaCegarLoop]: trace histogram [150, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:24:52,768 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 22:24:52,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:52,965 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:24:52,965 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:24:52,965 INFO L85 PathProgramCache]: Analyzing trace with hash 1989884405, now seen corresponding path program 3 times [2023-04-02 22:24:52,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:24:52,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815657701] [2023-04-02 22:24:52,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:24:52,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:24:53,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:24:54,878 INFO L134 CoverageAnalysis]: Checked inductivity of 11642 backedges. 5208 proven. 1275 refuted. 0 times theorem prover too weak. 5159 trivial. 0 not checked. [2023-04-02 22:24:54,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:24:54,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815657701] [2023-04-02 22:24:54,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815657701] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:24:54,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24891653] [2023-04-02 22:24:54,879 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:24:54,879 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:24:54,879 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:24:54,880 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:24:54,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 22:24:55,030 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:24:55,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:24:55,038 WARN L260 TraceCheckSpWp]: Trace formula consists of 694 conjuncts, 434 conjunts are in the unsatisfiable core [2023-04-02 22:24:55,047 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:25:06,602 INFO L134 CoverageAnalysis]: Checked inductivity of 11642 backedges. 204 proven. 11386 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-04-02 22:25:06,602 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:25:32,479 INFO L134 CoverageAnalysis]: Checked inductivity of 11642 backedges. 1332 proven. 10308 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:25:32,480 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [24891653] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:25:32,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511497035] [2023-04-02 22:25:32,481 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:25:32,481 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:25:32,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:25:32,481 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:25:32,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:25:32,498 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 16 for LOIs [2023-04-02 22:25:32,772 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2023-04-02 22:25:32,780 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-04-02 22:25:32,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-02 22:25:32,784 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:25:34,544 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4999#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:25:34,544 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:25:34,544 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:25:34,544 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 115, 162] total 327 [2023-04-02 22:25:34,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652536950] [2023-04-02 22:25:34,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:25:34,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 327 states [2023-04-02 22:25:34,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:25:34,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 327 interpolants. [2023-04-02 22:25:34,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13904, Invalid=102036, Unknown=0, NotChecked=0, Total=115940 [2023-04-02 22:25:34,557 INFO L87 Difference]: Start difference. First operand 178 states and 182 transitions. Second operand has 327 states, 322 states have (on average 1.0714285714285714) internal successors, (345), 325 states have internal predecessors, (345), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-02 22:25:44,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:25:44,834 INFO L93 Difference]: Finished difference Result 464 states and 629 transitions. [2023-04-02 22:25:44,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2023-04-02 22:25:44,834 INFO L78 Accepts]: Start accepts. Automaton has has 327 states, 322 states have (on average 1.0714285714285714) internal successors, (345), 325 states have internal predecessors, (345), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) Word has length 179 [2023-04-02 22:25:44,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:25:44,837 INFO L225 Difference]: With dead ends: 464 [2023-04-02 22:25:44,837 INFO L226 Difference]: Without dead ends: 347 [2023-04-02 22:25:44,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 238 SyntacticMatches, 15 SemanticMatches, 448 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68437 ImplicationChecksByTransitivity, 40.9s TimeCoverageRelationStatistics Valid=31331, Invalid=170719, Unknown=0, NotChecked=0, Total=202050 [2023-04-02 22:25:44,848 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 775 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 3350 mSolverCounterSat, 515 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 775 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 3865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 515 IncrementalHoareTripleChecker+Valid, 3350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:25:44,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [775 Valid, 221 Invalid, 3865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [515 Valid, 3350 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-04-02 22:25:44,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2023-04-02 22:25:44,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 337. [2023-04-02 22:25:44,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 324 states have (on average 1.0154320987654322) internal successors, (329), 326 states have internal predecessors, (329), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 22:25:44,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 342 transitions. [2023-04-02 22:25:44,899 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 342 transitions. Word has length 179 [2023-04-02 22:25:44,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:25:44,900 INFO L495 AbstractCegarLoop]: Abstraction has 337 states and 342 transitions. [2023-04-02 22:25:44,900 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 327 states, 322 states have (on average 1.0714285714285714) internal successors, (345), 325 states have internal predecessors, (345), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-02 22:25:44,900 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 342 transitions. [2023-04-02 22:25:44,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2023-04-02 22:25:44,903 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:25:44,903 INFO L195 NwaCegarLoop]: trace histogram [304, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:25:44,911 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-02 22:25:45,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:25:45,110 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:25:45,110 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:25:45,111 INFO L85 PathProgramCache]: Analyzing trace with hash 1746916989, now seen corresponding path program 4 times [2023-04-02 22:25:45,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:25:45,111 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294329944] [2023-04-02 22:25:45,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:25:45,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:25:45,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:25:51,478 INFO L134 CoverageAnalysis]: Checked inductivity of 46985 backedges. 20916 proven. 5151 refuted. 0 times theorem prover too weak. 20918 trivial. 0 not checked. [2023-04-02 22:25:51,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:25:51,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294329944] [2023-04-02 22:25:51,478 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294329944] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:25:51,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466095341] [2023-04-02 22:25:51,478 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:25:51,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:25:51,478 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:25:51,479 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:25:51,482 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 22:25:51,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:25:51,696 INFO L262 TraceCheckSpWp]: Trace formula consists of 1341 conjuncts, 104 conjunts are in the unsatisfiable core [2023-04-02 22:25:51,701 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:25:55,477 INFO L134 CoverageAnalysis]: Checked inductivity of 46985 backedges. 20912 proven. 5151 refuted. 0 times theorem prover too weak. 20922 trivial. 0 not checked. [2023-04-02 22:25:55,478 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:26:05,153 INFO L134 CoverageAnalysis]: Checked inductivity of 46985 backedges. 20916 proven. 5151 refuted. 0 times theorem prover too weak. 20918 trivial. 0 not checked. [2023-04-02 22:26:05,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466095341] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:26:05,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [114760496] [2023-04-02 22:26:05,156 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:26:05,157 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:26:05,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:26:05,158 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:26:05,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:26:05,174 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 16 for LOIs [2023-04-02 22:26:05,437 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2023-04-02 22:26:05,445 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-04-02 22:26:05,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-02 22:26:05,449 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:26:06,283 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9101#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:26:06,283 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:26:06,283 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:26:06,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 310 [2023-04-02 22:26:06,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033897606] [2023-04-02 22:26:06,284 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:26:06,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 310 states [2023-04-02 22:26:06,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:26:06,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 310 interpolants. [2023-04-02 22:26:06,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42491, Invalid=62161, Unknown=0, NotChecked=0, Total=104652 [2023-04-02 22:26:06,299 INFO L87 Difference]: Start difference. First operand 337 states and 342 transitions. Second operand has 310 states, 310 states have (on average 1.0580645161290323) internal successors, (328), 310 states have internal predecessors, (328), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-02 22:26:15,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:26:15,956 INFO L93 Difference]: Finished difference Result 865 states and 1182 transitions. [2023-04-02 22:26:15,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 207 states. [2023-04-02 22:26:15,957 INFO L78 Accepts]: Start accepts. Automaton has has 310 states, 310 states have (on average 1.0580645161290323) internal successors, (328), 310 states have internal predecessors, (328), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 333 [2023-04-02 22:26:15,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:26:15,959 INFO L225 Difference]: With dead ends: 865 [2023-04-02 22:26:15,959 INFO L226 Difference]: Without dead ends: 640 [2023-04-02 22:26:15,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1205 GetRequests, 781 SyntacticMatches, 0 SemanticMatches, 424 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70335 ImplicationChecksByTransitivity, 26.1s TimeCoverageRelationStatistics Valid=63809, Invalid=117241, Unknown=0, NotChecked=0, Total=181050 [2023-04-02 22:26:15,968 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 222 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:26:15,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 58 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:26:15,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2023-04-02 22:26:16,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 640. [2023-04-02 22:26:16,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 640 states, 629 states have (on average 1.0063593004769475) internal successors, (633), 630 states have internal predecessors, (633), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:26:16,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 644 transitions. [2023-04-02 22:26:16,073 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 644 transitions. Word has length 333 [2023-04-02 22:26:16,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:26:16,073 INFO L495 AbstractCegarLoop]: Abstraction has 640 states and 644 transitions. [2023-04-02 22:26:16,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 310 states, 310 states have (on average 1.0580645161290323) internal successors, (328), 310 states have internal predecessors, (328), 4 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2023-04-02 22:26:16,074 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 644 transitions. [2023-04-02 22:26:16,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 642 [2023-04-02 22:26:16,081 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:26:16,082 INFO L195 NwaCegarLoop]: trace histogram [612, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:26:16,091 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 22:26:16,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:26:16,290 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:26:16,290 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:26:16,290 INFO L85 PathProgramCache]: Analyzing trace with hash -547448395, now seen corresponding path program 5 times [2023-04-02 22:26:16,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:26:16,290 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60565654] [2023-04-02 22:26:16,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:26:16,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:26:16,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:26:41,698 INFO L134 CoverageAnalysis]: Checked inductivity of 188819 backedges. 84056 proven. 20910 refuted. 0 times theorem prover too weak. 83853 trivial. 0 not checked. [2023-04-02 22:26:41,699 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:26:41,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60565654] [2023-04-02 22:26:41,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60565654] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:26:41,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415112502] [2023-04-02 22:26:41,699 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:26:41,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:26:41,699 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:26:41,700 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:26:41,702 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 22:26:42,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 103 check-sat command(s) [2023-04-02 22:26:42,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:26:42,726 INFO L262 TraceCheckSpWp]: Trace formula consists of 1732 conjuncts, 207 conjunts are in the unsatisfiable core [2023-04-02 22:26:42,734 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:26:57,071 INFO L134 CoverageAnalysis]: Checked inductivity of 188819 backedges. 84056 proven. 20910 refuted. 0 times theorem prover too weak. 83853 trivial. 0 not checked. [2023-04-02 22:26:57,071 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:27:36,327 INFO L134 CoverageAnalysis]: Checked inductivity of 188819 backedges. 6 proven. 104960 refuted. 0 times theorem prover too weak. 83853 trivial. 0 not checked. [2023-04-02 22:27:36,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415112502] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:27:36,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [569033352] [2023-04-02 22:27:36,330 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-02 22:27:36,330 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:27:36,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:27:36,330 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:27:36,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:27:36,343 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 16 for LOIs [2023-04-02 22:27:36,597 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2023-04-02 22:27:36,605 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 26 for LOIs [2023-04-02 22:27:36,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-02 22:27:36,609 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:27:37,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16758#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-02 22:27:37,993 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:27:37,993 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:27:37,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [208, 208, 208] total 619 [2023-04-02 22:27:37,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588726864] [2023-04-02 22:27:37,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:27:37,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 619 states [2023-04-02 22:27:37,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:27:38,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 619 interpolants. [2023-04-02 22:27:38,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169799, Invalid=230257, Unknown=0, NotChecked=0, Total=400056 [2023-04-02 22:27:38,029 INFO L87 Difference]: Start difference. First operand 640 states and 644 transitions. Second operand has 619 states, 619 states have (on average 1.0403877221324718) internal successors, (644), 619 states have internal predecessors, (644), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-04-02 22:28:17,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:28:17,123 INFO L93 Difference]: Finished difference Result 1683 states and 2308 transitions. [2023-04-02 22:28:17,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 413 states. [2023-04-02 22:28:17,124 INFO L78 Accepts]: Start accepts. Automaton has has 619 states, 619 states have (on average 1.0403877221324718) internal successors, (644), 619 states have internal predecessors, (644), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 641 [2023-04-02 22:28:17,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:28:17,128 INFO L225 Difference]: With dead ends: 1683 [2023-04-02 22:28:17,128 INFO L226 Difference]: Without dead ends: 1258 [2023-04-02 22:28:17,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2335 GetRequests, 1499 SyntacticMatches, 0 SemanticMatches, 836 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267992 ImplicationChecksByTransitivity, 102.1s TimeCoverageRelationStatistics Valid=254874, Invalid=446532, Unknown=0, NotChecked=0, Total=701406 [2023-04-02 22:28:17,160 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 4 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 597 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 597 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:28:17,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 86 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 597 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 22:28:17,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1258 states. [2023-04-02 22:28:17,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1258 to 1258. [2023-04-02 22:28:17,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1258 states, 1247 states have (on average 1.0032076984763432) internal successors, (1251), 1248 states have internal predecessors, (1251), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:28:17,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1258 states to 1258 states and 1262 transitions. [2023-04-02 22:28:17,425 INFO L78 Accepts]: Start accepts. Automaton has 1258 states and 1262 transitions. Word has length 641 [2023-04-02 22:28:17,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:28:17,425 INFO L495 AbstractCegarLoop]: Abstraction has 1258 states and 1262 transitions. [2023-04-02 22:28:17,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 619 states, 619 states have (on average 1.0403877221324718) internal successors, (644), 619 states have internal predecessors, (644), 4 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-04-02 22:28:17,426 INFO L276 IsEmpty]: Start isEmpty. Operand 1258 states and 1262 transitions. [2023-04-02 22:28:17,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2023-04-02 22:28:17,436 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:28:17,437 INFO L195 NwaCegarLoop]: trace histogram [1230, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:28:17,445 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-04-02 22:28:17,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-02 22:28:17,645 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:28:17,645 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:28:17,646 INFO L85 PathProgramCache]: Analyzing trace with hash -2054555403, now seen corresponding path program 6 times [2023-04-02 22:28:17,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:28:17,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878518198] [2023-04-02 22:28:17,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:28:17,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:28:18,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat