/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 EqDomain -i ../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:10:35,792 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:10:35,794 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:10:35,827 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:10:35,828 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:10:35,828 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:10:35,836 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:10:35,838 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:10:35,840 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:10:35,844 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:10:35,846 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:10:35,847 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:10:35,847 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:10:35,851 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:10:35,852 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:10:35,855 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:10:35,856 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:10:35,856 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:10:35,857 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:10:35,859 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:10:35,859 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:10:35,862 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:10:35,863 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:10:35,865 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:10:35,872 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-01 11:10:35,874 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:10:35,875 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:10:35,875 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:10:35,876 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:10:35,876 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:10:35,877 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:10:35,877 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:10:35,877 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:10:35,878 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:10:35,878 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:10:35,879 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:10:35,884 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 11:10:35,912 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:10:35,913 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:10:35,913 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:10:35,913 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:10:35,914 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:10:35,914 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:10:35,914 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:10:35,914 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:10:35,914 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:10:35,914 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:10:35,915 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:10:35,915 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:10:35,915 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:10:35,915 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:10:35,915 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:10:35,916 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:10:35,916 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:10:35,916 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:10:35,916 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:10:35,916 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:10:35,917 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:10:35,918 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:10:35,918 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:10:35,918 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:10:35,918 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:10:35,918 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:10:35,918 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:10:35,918 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:10:35,919 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:10:35,919 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:10:35,919 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:10:35,919 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:10:35,919 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:10:36,131 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:10:36,147 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:10:36,149 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:10:36,150 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:10:36,151 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:10:36,152 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c [2023-04-01 11:10:37,292 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:10:37,459 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:10:37,459 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c [2023-04-01 11:10:37,464 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/60870ae36/151da86ab19d4d688fb27334afae112c/FLAG8c24ab403 [2023-04-01 11:10:37,477 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/60870ae36/151da86ab19d4d688fb27334afae112c [2023-04-01 11:10:37,479 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:10:37,480 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:10:37,481 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:10:37,481 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:10:37,484 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:10:37,484 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,485 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54f963e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37, skipping insertion in model container [2023-04-01 11:10:37,485 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,492 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:10:37,510 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:10:37,635 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_notd2.c[468,481] [2023-04-01 11:10:37,646 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:10:37,653 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:10:37,661 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_notd2.c[468,481] [2023-04-01 11:10:37,666 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:10:37,675 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:10:37,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37 WrapperNode [2023-04-01 11:10:37,676 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:10:37,676 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:10:37,676 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:10:37,676 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:10:37,683 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,687 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,687 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,691 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,694 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,694 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,695 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,696 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:10:37,697 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:10:37,697 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:10:37,697 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:10:37,698 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (1/1) ... [2023-04-01 11:10:37,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:10:37,712 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:37,722 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 11:10:37,723 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 11:10:37,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:10:37,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:10:37,750 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:10:37,750 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 11:10:37,750 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 11:10:37,750 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:10:37,751 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:10:37,752 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:10:37,752 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:10:37,752 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:10:37,752 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:10:37,752 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:10:37,812 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:10:37,813 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:10:37,935 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:10:38,068 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:10:38,068 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 11:10:38,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:10:38 BoogieIcfgContainer [2023-04-01 11:10:38,070 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:10:38,072 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:10:38,072 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:10:38,075 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:10:38,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:10:37" (1/3) ... [2023-04-01 11:10:38,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e1ee93e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:10:38, skipping insertion in model container [2023-04-01 11:10:38,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:10:37" (2/3) ... [2023-04-01 11:10:38,076 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e1ee93e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:10:38, skipping insertion in model container [2023-04-01 11:10:38,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:10:38" (3/3) ... [2023-04-01 11:10:38,077 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_delay_notd2.c [2023-04-01 11:10:38,090 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:10:38,090 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:10:38,127 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:10:38,133 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;@6148f793, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:10:38,133 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:10:38,137 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) [2023-04-01 11:10:38,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 11:10:38,143 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:38,143 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:38,144 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:38,148 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:38,148 INFO L85 PathProgramCache]: Analyzing trace with hash -1065726219, now seen corresponding path program 1 times [2023-04-01 11:10:38,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:38,158 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069830434] [2023-04-01 11:10:38,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:38,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:38,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:38,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:38,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:38,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069830434] [2023-04-01 11:10:38,500 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069830434] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:10:38,500 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:10:38,500 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 11:10:38,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250269227] [2023-04-01 11:10:38,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:10:38,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 11:10:38,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:10:38,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 11:10:38,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:10:38,532 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) [2023-04-01 11:10:38,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:10:38,586 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2023-04-01 11:10:38,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 11:10:38,588 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 [2023-04-01 11:10:38,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:10:38,592 INFO L225 Difference]: With dead ends: 32 [2023-04-01 11:10:38,593 INFO L226 Difference]: Without dead ends: 20 [2023-04-01 11:10:38,595 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 [2023-04-01 11:10:38,598 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 [2023-04-01 11:10:38,599 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] [2023-04-01 11:10:38,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-01 11:10:38,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2023-04-01 11:10:38,629 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) [2023-04-01 11:10:38,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-04-01 11:10:38,631 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2023-04-01 11:10:38,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:10:38,633 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-04-01 11:10:38,633 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) [2023-04-01 11:10:38,633 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-04-01 11:10:38,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-01 11:10:38,635 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:38,635 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:38,636 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 11:10:38,637 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:38,638 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:38,638 INFO L85 PathProgramCache]: Analyzing trace with hash 1088035662, now seen corresponding path program 1 times [2023-04-01 11:10:38,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:38,638 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586252905] [2023-04-01 11:10:38,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:38,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:38,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:38,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:38,786 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:38,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586252905] [2023-04-01 11:10:38,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586252905] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:10:38,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979823005] [2023-04-01 11:10:38,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:38,788 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:38,788 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:38,791 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:10:38,813 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 11:10:38,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:38,852 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 11:10:38,856 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:10:38,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:38,940 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:10:39,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:39,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979823005] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:10:39,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [967060911] [2023-04-01 11:10:39,065 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:10:39,065 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:10:39,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:10:39,072 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:10:39,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:10:39,244 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:10:39,817 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:10:39,986 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:10:40,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:10:40,017 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:10:40,959 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 [2023-04-01 11:10:40,959 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:10:40,959 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:10:40,960 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-04-01 11:10:40,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359119005] [2023-04-01 11:10:40,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:10:40,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 11:10:40,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:10:40,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 11:10:40,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2023-04-01 11:10:40,963 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) [2023-04-01 11:10:41,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:10:41,038 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2023-04-01 11:10:41,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 11:10:41,039 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 [2023-04-01 11:10:41,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:10:41,040 INFO L225 Difference]: With dead ends: 33 [2023-04-01 11:10:41,040 INFO L226 Difference]: Without dead ends: 23 [2023-04-01 11:10:41,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2023-04-01 11:10:41,043 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 [2023-04-01 11:10:41,044 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] [2023-04-01 11:10:41,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-04-01 11:10:41,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-04-01 11:10:41,051 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) [2023-04-01 11:10:41,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-04-01 11:10:41,052 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 16 [2023-04-01 11:10:41,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:10:41,053 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-04-01 11:10:41,053 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) [2023-04-01 11:10:41,053 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-04-01 11:10:41,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 11:10:41,054 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:41,054 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:41,064 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 11:10:41,260 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 [2023-04-01 11:10:41,261 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:41,261 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:41,261 INFO L85 PathProgramCache]: Analyzing trace with hash -1070129867, now seen corresponding path program 2 times [2023-04-01 11:10:41,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:41,263 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518990034] [2023-04-01 11:10:41,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:41,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:41,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:41,443 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:41,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:41,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518990034] [2023-04-01 11:10:41,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518990034] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:10:41,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760426726] [2023-04-01 11:10:41,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:10:41,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:41,446 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:41,449 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) [2023-04-01 11:10:41,452 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 11:10:41,500 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 11:10:41,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:10:41,501 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 11:10:41,503 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:10:41,580 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:41,580 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:10:41,661 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:41,661 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760426726] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:10:41,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [275717791] [2023-04-01 11:10:41,663 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:10:41,663 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:10:41,663 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:10:41,663 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:10:41,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:10:41,705 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:10:41,962 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:10:42,035 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:10:42,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:10:42,054 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:10:44,969 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 [2023-04-01 11:10:44,970 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:10:44,970 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:10:44,970 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2023-04-01 11:10:44,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264682288] [2023-04-01 11:10:44,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:10:44,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-01 11:10:44,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:10:44,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-01 11:10:44,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=780, Unknown=0, NotChecked=0, Total=992 [2023-04-01 11:10:44,973 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) [2023-04-01 11:10:45,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:10:45,132 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2023-04-01 11:10:45,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 11:10:45,132 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 [2023-04-01 11:10:45,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:10:45,133 INFO L225 Difference]: With dead ends: 42 [2023-04-01 11:10:45,133 INFO L226 Difference]: Without dead ends: 29 [2023-04-01 11:10:45,134 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=292, Invalid=1040, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 11:10:45,135 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 [2023-04-01 11:10:45,135 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] [2023-04-01 11:10:45,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-04-01 11:10:45,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2023-04-01 11:10:45,139 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) [2023-04-01 11:10:45,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2023-04-01 11:10:45,140 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 19 [2023-04-01 11:10:45,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:10:45,140 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2023-04-01 11:10:45,140 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) [2023-04-01 11:10:45,142 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2023-04-01 11:10:45,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 11:10:45,142 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:45,143 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:45,149 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 11:10:45,348 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 [2023-04-01 11:10:45,349 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:45,349 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:45,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1875954027, now seen corresponding path program 3 times [2023-04-01 11:10:45,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:45,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943897057] [2023-04-01 11:10:45,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:45,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:45,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:45,658 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:45,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:45,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943897057] [2023-04-01 11:10:45,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943897057] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:10:45,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527861263] [2023-04-01 11:10:45,659 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:10:45,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:45,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:45,660 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) [2023-04-01 11:10:45,684 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 11:10:45,712 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:10:45,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:10:45,715 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 40 conjunts are in the unsatisfiable core [2023-04-01 11:10:45,718 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:10:47,196 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 45 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:47,196 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:10:49,249 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 28 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:10:49,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527861263] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:10:49,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1280097235] [2023-04-01 11:10:49,251 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:10:49,251 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:10:49,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:10:49,252 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:10:49,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:10:49,286 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:10:49,508 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:10:49,579 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:10:49,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:10:49,590 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:10:52,788 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 [2023-04-01 11:10:52,788 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:10:52,788 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:10:52,788 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 44 [2023-04-01 11:10:52,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455950980] [2023-04-01 11:10:52,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:10:52,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-01 11:10:52,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:10:52,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-01 11:10:52,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=2784, Unknown=0, NotChecked=0, Total=3192 [2023-04-01 11:10:52,792 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) [2023-04-01 11:10:58,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:10:58,497 INFO L93 Difference]: Finished difference Result 84 states and 95 transitions. [2023-04-01 11:10:58,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-04-01 11:10:58,497 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 [2023-04-01 11:10:58,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:10:58,499 INFO L225 Difference]: With dead ends: 84 [2023-04-01 11:10:58,499 INFO L226 Difference]: Without dead ends: 65 [2023-04-01 11:10:58,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2658 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=1410, Invalid=8290, Unknown=2, NotChecked=0, Total=9702 [2023-04-01 11:10:58,504 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 74 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 11:10:58,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 128 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 11:10:58,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-04-01 11:10:58,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2023-04-01 11:10:58,519 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) [2023-04-01 11:10:58,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2023-04-01 11:10:58,521 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 25 [2023-04-01 11:10:58,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:10:58,521 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2023-04-01 11:10:58,521 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) [2023-04-01 11:10:58,521 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2023-04-01 11:10:58,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-04-01 11:10:58,523 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:10:58,523 INFO L195 NwaCegarLoop]: trace histogram [34, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:10:58,531 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-01 11:10:58,731 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 [2023-04-01 11:10:58,731 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:10:58,732 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:10:58,732 INFO L85 PathProgramCache]: Analyzing trace with hash 1091525759, now seen corresponding path program 1 times [2023-04-01 11:10:58,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:10:58,732 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447458190] [2023-04-01 11:10:58,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:58,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:10:58,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:59,111 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 306 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-04-01 11:10:59,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:10:59,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447458190] [2023-04-01 11:10:59,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447458190] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:10:59,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703678664] [2023-04-01 11:10:59,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:10:59,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:10:59,112 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:10:59,117 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) [2023-04-01 11:10:59,119 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 11:10:59,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:10:59,201 INFO L262 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-01 11:10:59,204 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:10:59,375 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 302 proven. 66 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-01 11:10:59,375 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:10:59,562 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 306 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2023-04-01 11:10:59,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703678664] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:10:59,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1438121041] [2023-04-01 11:10:59,563 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 11:10:59,563 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:10:59,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:10:59,564 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:10:59,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:10:59,600 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 50 for LOIs [2023-04-01 11:11:00,317 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2023-04-01 11:11:00,329 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 82 for LOIs [2023-04-01 11:11:00,423 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2023-04-01 11:11:00,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:11:00,435 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:11:01,283 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1551#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 11:11:01,283 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:11:01,284 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:11:01,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 36 [2023-04-01 11:11:01,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600548639] [2023-04-01 11:11:01,284 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:11:01,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-01 11:11:01,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:11:01,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-01 11:11:01,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=588, Invalid=1862, Unknown=0, NotChecked=0, Total=2450 [2023-04-01 11:11:01,287 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 36 states have internal predecessors, (55), 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) [2023-04-01 11:11:01,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:11:01,556 INFO L93 Difference]: Finished difference Result 128 states and 163 transitions. [2023-04-01 11:11:01,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-04-01 11:11:01,557 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 36 states have internal predecessors, (55), 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 [2023-04-01 11:11:01,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:11:01,559 INFO L225 Difference]: With dead ends: 128 [2023-04-01 11:11:01,559 INFO L226 Difference]: Without dead ends: 88 [2023-04-01 11:11:01,560 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 151 SyntacticMatches, 4 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1609 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=788, Invalid=2518, Unknown=0, NotChecked=0, Total=3306 [2023-04-01 11:11:01,561 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 34 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:11:01,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 51 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:11:01,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-04-01 11:11:01,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2023-04-01 11:11:01,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 77 states have (on average 1.051948051948052) internal successors, (81), 78 states have internal predecessors, (81), 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) [2023-04-01 11:11:01,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2023-04-01 11:11:01,580 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 63 [2023-04-01 11:11:01,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:11:01,580 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2023-04-01 11:11:01,581 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 36 states have internal predecessors, (55), 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) [2023-04-01 11:11:01,581 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2023-04-01 11:11:01,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-04-01 11:11:01,583 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:11:01,583 INFO L195 NwaCegarLoop]: trace histogram [60, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:11:01,589 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 11:11:01,789 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 [2023-04-01 11:11:01,789 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:11:01,790 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:11:01,790 INFO L85 PathProgramCache]: Analyzing trace with hash 800969589, now seen corresponding path program 2 times [2023-04-01 11:11:01,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:11:01,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662139286] [2023-04-01 11:11:01,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:11:01,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:11:01,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:11:18,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1967 backedges. 2 proven. 1961 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 11:11:18,167 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:11:18,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662139286] [2023-04-01 11:11:18,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662139286] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:11:18,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178722714] [2023-04-01 11:11:18,167 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:11:18,167 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:11:18,167 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:11:18,168 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) [2023-04-01 11:11:18,170 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 11:11:18,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2023-04-01 11:11:18,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:11:18,290 INFO L262 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 151 conjunts are in the unsatisfiable core [2023-04-01 11:11:18,297 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:11:26,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1967 backedges. 29 proven. 1756 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2023-04-01 11:11:26,214 INFO L327 TraceCheckSpWp]: Computing backward predicates...