/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/mono-crafted_13.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:20:41,753 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:20:41,754 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:20:41,776 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:20:41,777 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:20:41,780 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:20:41,783 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:20:41,785 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:20:41,786 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:20:41,790 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:20:41,791 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:20:41,792 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:20:41,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:20:41,795 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:20:41,797 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:20:41,798 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:20:41,798 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:20:41,799 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:20:41,800 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:20:41,804 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:20:41,805 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:20:41,806 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:20:41,806 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:20:41,807 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:20:41,810 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:20:41,810 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:20:41,811 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:20:41,811 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:20:41,812 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:20:41,812 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:20:41,813 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:20:41,813 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:20:41,814 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:20:41,814 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:20:41,815 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:20:41,815 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:20:41,815 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:20:41,815 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:20:41,815 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:20:41,816 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:20:41,816 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:20:41,817 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 22:20:41,840 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:20:41,840 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:20:41,840 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:20:41,840 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:20:41,841 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:20:41,841 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:20:41,841 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:20:41,842 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:20:41,842 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:20:41,842 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:20:41,842 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:20:41,842 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:20:41,842 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:20:41,842 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:20:41,842 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:20:41,842 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:20:41,843 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:20:41,843 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:20:41,843 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:20:41,844 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:20:41,844 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:20:41,844 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:20:41,844 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:20:41,844 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:20:41,844 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:20:41,844 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:20:42,009 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:20:42,022 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:20:42,023 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:20:42,024 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:20:42,024 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:20:42,025 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/mono-crafted_13.c [2023-04-02 22:20:42,922 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:20:43,099 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:20:43,100 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/mono-crafted_13.c [2023-04-02 22:20:43,103 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf78a1a45/35e5500cb6684693923e3d7f649e6dc6/FLAGc6ea6f60e [2023-04-02 22:20:43,113 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf78a1a45/35e5500cb6684693923e3d7f649e6dc6 [2023-04-02 22:20:43,117 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:20:43,118 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:20:43,119 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:20:43,119 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:20:43,121 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:20:43,122 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,123 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@689e63a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43, skipping insertion in model container [2023-04-02 22:20:43,123 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,128 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:20:43,136 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:20:43,232 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/mono-crafted_13.c[319,332] [2023-04-02 22:20:43,240 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:20:43,246 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:20:43,253 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/mono-crafted_13.c[319,332] [2023-04-02 22:20:43,255 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:20:43,263 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:20:43,263 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43 WrapperNode [2023-04-02 22:20:43,263 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:20:43,267 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:20:43,267 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:20:43,268 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:20:43,274 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,274 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,278 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,278 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,280 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,282 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,283 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,283 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,284 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:20:43,285 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:20:43,285 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:20:43,285 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:20:43,285 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (1/1) ... [2023-04-02 22:20:43,297 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:20:43,304 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:43,321 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 22:20:43,323 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 22:20:43,372 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:20:43,372 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:20:43,373 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:20:43,374 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:20:43,374 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:20:43,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:20:43,375 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:20:43,375 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:20:43,375 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:20:43,464 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:20:43,466 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:20:43,550 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:20:43,586 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:20:43,586 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 22:20:43,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:20:43 BoogieIcfgContainer [2023-04-02 22:20:43,588 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:20:43,589 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:20:43,589 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:20:43,591 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:20:43,591 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:20:43" (1/3) ... [2023-04-02 22:20:43,592 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64541937 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:20:43, skipping insertion in model container [2023-04-02 22:20:43,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:20:43" (2/3) ... [2023-04-02 22:20:43,592 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64541937 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:20:43, skipping insertion in model container [2023-04-02 22:20:43,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:20:43" (3/3) ... [2023-04-02 22:20:43,593 INFO L112 eAbstractionObserver]: Analyzing ICFG mono-crafted_13.c [2023-04-02 22:20:43,610 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:20:43,610 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:20:43,645 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:20:43,652 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;@11d4d73c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:20:43,652 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:20:43,655 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:20:43,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-02 22:20:43,659 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:43,660 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:43,660 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:43,663 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:43,663 INFO L85 PathProgramCache]: Analyzing trace with hash 2129081965, now seen corresponding path program 1 times [2023-04-02 22:20:43,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:43,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201112942] [2023-04-02 22:20:43,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:43,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:43,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:43,796 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 22:20:43,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:43,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201112942] [2023-04-02 22:20:43,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201112942] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:20:43,797 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:20:43,797 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 22:20:43,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740975601] [2023-04-02 22:20:43,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:20:43,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 22:20:43,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:43,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 22:20:43,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:20:43,821 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:43,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:43,844 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2023-04-02 22:20:43,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 22:20:43,855 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-04-02 22:20:43,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:43,858 INFO L225 Difference]: With dead ends: 31 [2023-04-02 22:20:43,858 INFO L226 Difference]: Without dead ends: 13 [2023-04-02 22:20:43,860 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:20:43,867 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:43,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:20:43,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-04-02 22:20:43,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-04-02 22:20:43,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:43,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2023-04-02 22:20:43,889 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2023-04-02 22:20:43,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:43,889 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2023-04-02 22:20:43,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:43,890 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2023-04-02 22:20:43,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-02 22:20:43,890 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:43,890 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:43,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:20:43,890 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:43,891 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:43,891 INFO L85 PathProgramCache]: Analyzing trace with hash 780476817, now seen corresponding path program 1 times [2023-04-02 22:20:43,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:43,891 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998936970] [2023-04-02 22:20:43,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:43,891 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:43,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:43,991 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 22:20:43,991 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:43,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998936970] [2023-04-02 22:20:43,991 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998936970] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:43,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063660250] [2023-04-02 22:20:43,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:43,992 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:43,992 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:44,009 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 22:20:44,010 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 22:20:44,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:44,064 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 22:20:44,067 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:44,092 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 22:20:44,092 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:44,162 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 22:20:44,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063660250] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:44,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051851199] [2023-04-02 22:20:44,175 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-02 22:20:44,176 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:44,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:44,189 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:44,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:44,238 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:44,314 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 22:20:44,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:44,345 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:44,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '165#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:44,529 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:44,529 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:44,532 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 22:20:44,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941651836] [2023-04-02 22:20:44,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:44,533 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 22:20:44,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:44,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 22:20:44,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2023-04-02 22:20:44,536 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:44,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:44,556 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2023-04-02 22:20:44,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:20:44,556 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-04-02 22:20:44,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:44,557 INFO L225 Difference]: With dead ends: 22 [2023-04-02 22:20:44,557 INFO L226 Difference]: Without dead ends: 16 [2023-04-02 22:20:44,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2023-04-02 22:20:44,558 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 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 22:20:44,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:20:44,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-02 22:20:44,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-04-02 22:20:44,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:44,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2023-04-02 22:20:44,562 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 12 [2023-04-02 22:20:44,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:44,562 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2023-04-02 22:20:44,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:44,562 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2023-04-02 22:20:44,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 22:20:44,562 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:44,562 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:44,579 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 22:20:44,767 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 22:20:44,767 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:44,768 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:44,768 INFO L85 PathProgramCache]: Analyzing trace with hash 1822089069, now seen corresponding path program 2 times [2023-04-02 22:20:44,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:44,769 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27091495] [2023-04-02 22:20:44,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:44,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:44,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:44,887 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 22:20:44,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:44,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27091495] [2023-04-02 22:20:44,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27091495] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:44,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202718518] [2023-04-02 22:20:44,888 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:20:44,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:44,888 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:44,889 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 22:20:44,908 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 22:20:44,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:20:44,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:20:44,939 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 22:20:44,941 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:44,968 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 22:20:44,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:45,117 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 22:20:45,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [202718518] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:45,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1436839564] [2023-04-02 22:20:45,123 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-02 22:20:45,123 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:45,123 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:45,123 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:45,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:45,141 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:45,171 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 22:20:45,186 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:45,190 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:45,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:45,335 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:45,335 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:45,335 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-02 22:20:45,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805571311] [2023-04-02 22:20:45,335 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:45,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-02 22:20:45,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:45,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-02 22:20:45,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:20:45,337 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:45,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:45,368 INFO L93 Difference]: Finished difference Result 28 states and 35 transitions. [2023-04-02 22:20:45,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 22:20:45,369 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-02 22:20:45,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:45,369 INFO L225 Difference]: With dead ends: 28 [2023-04-02 22:20:45,369 INFO L226 Difference]: Without dead ends: 22 [2023-04-02 22:20:45,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:20:45,372 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:45,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 39 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:20:45,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-02 22:20:45,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-02 22:20:45,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:45,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-04-02 22:20:45,382 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 15 [2023-04-02 22:20:45,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:45,382 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-04-02 22:20:45,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:45,382 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-04-02 22:20:45,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:20:45,383 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:45,383 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:45,388 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 22:20:45,587 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 22:20:45,587 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:45,588 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:45,588 INFO L85 PathProgramCache]: Analyzing trace with hash 1520626925, now seen corresponding path program 3 times [2023-04-02 22:20:45,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:45,588 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386594227] [2023-04-02 22:20:45,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:45,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:45,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:45,838 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 22:20:45,838 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:45,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386594227] [2023-04-02 22:20:45,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386594227] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:45,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299716594] [2023-04-02 22:20:45,840 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:20:45,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:45,840 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:45,856 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 22:20:45,863 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 22:20:45,894 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:20:45,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:20:45,895 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 22:20:45,897 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:45,918 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 22:20:45,918 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:46,187 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 22:20:46,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299716594] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:46,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [819548338] [2023-04-02 22:20:46,189 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-02 22:20:46,189 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:46,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:46,190 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:46,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:46,206 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:46,242 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 22:20:46,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:46,269 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:46,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '585#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:46,439 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:46,439 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:46,439 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-02 22:20:46,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619447092] [2023-04-02 22:20:46,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:46,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 22:20:46,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:46,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 22:20:46,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=791, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:20:46,440 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:46,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:46,476 INFO L93 Difference]: Finished difference Result 40 states and 53 transitions. [2023-04-02 22:20:46,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 22:20:46,477 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2023-04-02 22:20:46,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:46,478 INFO L225 Difference]: With dead ends: 40 [2023-04-02 22:20:46,478 INFO L226 Difference]: Without dead ends: 34 [2023-04-02 22:20:46,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=331, Invalid=791, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:20:46,480 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:46,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:20:46,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-02 22:20:46,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-04-02 22:20:46,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:46,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2023-04-02 22:20:46,484 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 21 [2023-04-02 22:20:46,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:46,485 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2023-04-02 22:20:46,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:46,485 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2023-04-02 22:20:46,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-02 22:20:46,485 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:46,485 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:46,497 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-02 22:20:46,690 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 22:20:46,690 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:46,690 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:46,690 INFO L85 PathProgramCache]: Analyzing trace with hash -777345043, now seen corresponding path program 4 times [2023-04-02 22:20:46,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:46,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419962877] [2023-04-02 22:20:46,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:46,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:46,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:47,379 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:20:47,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:47,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419962877] [2023-04-02 22:20:47,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419962877] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:47,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941092645] [2023-04-02 22:20:47,380 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:20:47,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:47,380 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:47,389 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 22:20:47,397 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 22:20:47,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:47,433 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 22:20:47,436 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:47,474 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:20:47,474 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:48,229 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:20:48,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [941092645] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:48,229 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1837682143] [2023-04-02 22:20:48,230 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-02 22:20:48,230 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:48,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:48,231 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:48,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:48,258 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:48,275 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 22:20:48,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:48,282 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:48,477 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '975#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:48,477 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:48,477 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:48,477 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-04-02 22:20:48,477 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377090125] [2023-04-02 22:20:48,477 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:48,478 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-02 22:20:48,478 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:48,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-02 22:20:48,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1207, Invalid=2099, Unknown=0, NotChecked=0, Total=3306 [2023-04-02 22:20:48,480 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:48,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:48,521 INFO L93 Difference]: Finished difference Result 64 states and 89 transitions. [2023-04-02 22:20:48,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-02 22:20:48,521 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2023-04-02 22:20:48,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:48,522 INFO L225 Difference]: With dead ends: 64 [2023-04-02 22:20:48,522 INFO L226 Difference]: Without dead ends: 58 [2023-04-02 22:20:48,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1207, Invalid=2099, Unknown=0, NotChecked=0, Total=3306 [2023-04-02 22:20:48,523 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:48,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:20:48,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-04-02 22:20:48,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-04-02 22:20:48,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:48,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2023-04-02 22:20:48,528 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 33 [2023-04-02 22:20:48,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:48,528 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2023-04-02 22:20:48,528 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:48,528 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2023-04-02 22:20:48,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-02 22:20:48,529 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:48,529 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:48,545 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-02 22:20:48,733 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 22:20:48,734 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:48,734 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:48,734 INFO L85 PathProgramCache]: Analyzing trace with hash -2043109907, now seen corresponding path program 5 times [2023-04-02 22:20:48,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:48,734 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599038878] [2023-04-02 22:20:48,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:48,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:48,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:50,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:20:50,767 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:50,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599038878] [2023-04-02 22:20:50,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599038878] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:50,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476913222] [2023-04-02 22:20:50,767 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:20:50,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:50,768 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:50,769 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 22:20:50,775 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 22:20:50,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2023-04-02 22:20:50,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:20:50,837 INFO L262 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-02 22:20:50,840 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:50,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:20:50,908 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:53,513 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:20:53,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1476913222] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:53,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1729080184] [2023-04-02 22:20:53,515 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-02 22:20:53,515 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:53,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:53,515 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:53,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:53,525 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:53,543 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 22:20:53,548 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:53,550 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:53,872 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1653#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:53,873 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:53,873 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:53,873 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2023-04-02 22:20:53,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885342579] [2023-04-02 22:20:53,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:53,874 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-04-02 22:20:53,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:53,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-04-02 22:20:53,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4687, Invalid=6443, Unknown=0, NotChecked=0, Total=11130 [2023-04-02 22:20:53,880 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:53,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:53,975 INFO L93 Difference]: Finished difference Result 112 states and 161 transitions. [2023-04-02 22:20:53,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-04-02 22:20:53,975 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2023-04-02 22:20:53,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:53,977 INFO L225 Difference]: With dead ends: 112 [2023-04-02 22:20:53,977 INFO L226 Difference]: Without dead ends: 106 [2023-04-02 22:20:53,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1462 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4687, Invalid=6443, Unknown=0, NotChecked=0, Total=11130 [2023-04-02 22:20:53,980 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:53,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 39 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:20:53,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2023-04-02 22:20:53,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2023-04-02 22:20:53,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0198019801980198) internal successors, (103), 101 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:53,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2023-04-02 22:20:53,995 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 57 [2023-04-02 22:20:53,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:53,996 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2023-04-02 22:20:53,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:53,996 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2023-04-02 22:20:54,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-04-02 22:20:54,001 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:54,001 INFO L195 NwaCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:54,009 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-02 22:20:54,206 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 22:20:54,207 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:54,207 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:54,207 INFO L85 PathProgramCache]: Analyzing trace with hash -833713683, now seen corresponding path program 6 times [2023-04-02 22:20:54,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:54,207 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82960387] [2023-04-02 22:20:54,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:54,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:54,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:21:00,432 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:21:00,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:21:00,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82960387] [2023-04-02 22:21:00,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82960387] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:21:00,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [673061821] [2023-04-02 22:21:00,433 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:21:00,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:21:00,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:21:00,434 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 22:21:00,435 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 22:21:00,508 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:21:00,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:21:00,510 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 96 conjunts are in the unsatisfiable core [2023-04-02 22:21:00,516 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:21:00,640 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:21:00,640 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:21:07,806 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:21:07,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [673061821] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:21:07,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [334573819] [2023-04-02 22:21:07,808 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-02 22:21:07,808 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:21:07,808 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:21:07,808 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:21:07,808 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:21:07,819 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:21:07,845 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 22:21:07,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:21:07,865 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:21:08,307 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2907#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:21:08,307 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:21:08,307 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:21:08,307 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2023-04-02 22:21:08,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603140737] [2023-04-02 22:21:08,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:21:08,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2023-04-02 22:21:08,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:21:08,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2023-04-02 22:21:08,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18559, Invalid=22043, Unknown=0, NotChecked=0, Total=40602 [2023-04-02 22:21:08,318 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:21:08,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:21:08,585 INFO L93 Difference]: Finished difference Result 208 states and 305 transitions. [2023-04-02 22:21:08,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2023-04-02 22:21:08,586 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2023-04-02 22:21:08,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:21:08,588 INFO L225 Difference]: With dead ends: 208 [2023-04-02 22:21:08,588 INFO L226 Difference]: Without dead ends: 202 [2023-04-02 22:21:08,590 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 211 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2950 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=18559, Invalid=22043, Unknown=0, NotChecked=0, Total=40602 [2023-04-02 22:21:08,591 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:21:08,591 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 39 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:21:08,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2023-04-02 22:21:08,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2023-04-02 22:21:08,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.0101522842639594) internal successors, (199), 197 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:21:08,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2023-04-02 22:21:08,601 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 105 [2023-04-02 22:21:08,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:21:08,601 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2023-04-02 22:21:08,601 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:21:08,601 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2023-04-02 22:21:08,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2023-04-02 22:21:08,602 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:21:08,602 INFO L195 NwaCegarLoop]: trace histogram [190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:21:08,619 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 22:21:08,803 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 22:21:08,803 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:21:08,803 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:21:08,803 INFO L85 PathProgramCache]: Analyzing trace with hash 40002029, now seen corresponding path program 7 times [2023-04-02 22:21:08,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:21:08,803 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209564295] [2023-04-02 22:21:08,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:21:08,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:21:08,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:21:32,882 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:21:32,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:21:32,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209564295] [2023-04-02 22:21:32,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209564295] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:21:32,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627279633] [2023-04-02 22:21:32,882 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:21:32,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:21:32,882 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:21:32,883 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 22:21:32,922 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 22:21:33,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:21:33,031 INFO L262 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 192 conjunts are in the unsatisfiable core [2023-04-02 22:21:33,040 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:21:33,306 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:21:33,307 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:21:59,074 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:21:59,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627279633] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:21:59,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [492476432] [2023-04-02 22:21:59,075 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-04-02 22:21:59,075 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:21:59,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:21:59,076 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:21:59,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:21:59,084 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:21:59,100 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 22:21:59,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:21:59,113 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:21:59,711 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5313#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:21:59,711 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:21:59,711 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:21:59,711 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 385 [2023-04-02 22:21:59,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721665402] [2023-04-02 22:21:59,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:21:59,712 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2023-04-02 22:21:59,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:21:59,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2023-04-02 22:21:59,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73951, Invalid=80891, Unknown=0, NotChecked=0, Total=154842 [2023-04-02 22:21:59,734 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:22:00,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:22:00,872 INFO L93 Difference]: Finished difference Result 400 states and 593 transitions. [2023-04-02 22:22:00,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2023-04-02 22:22:00,874 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 201 [2023-04-02 22:22:00,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:22:00,877 INFO L225 Difference]: With dead ends: 400 [2023-04-02 22:22:00,877 INFO L226 Difference]: Without dead ends: 394 [2023-04-02 22:22:00,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 795 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 392 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5926 ImplicationChecksByTransitivity, 34.1s TimeCoverageRelationStatistics Valid=73951, Invalid=80891, Unknown=0, NotChecked=0, Total=154842 [2023-04-02 22:22:00,883 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:22:00,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 51 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:22:00,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2023-04-02 22:22:00,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 394. [2023-04-02 22:22:00,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 389 states have (on average 1.0051413881748072) internal successors, (391), 389 states have internal predecessors, (391), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:22:00,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 395 transitions. [2023-04-02 22:22:00,907 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 395 transitions. Word has length 201 [2023-04-02 22:22:00,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:22:00,908 INFO L495 AbstractCegarLoop]: Abstraction has 394 states and 395 transitions. [2023-04-02 22:22:00,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:22:00,908 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 395 transitions. [2023-04-02 22:22:00,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 394 [2023-04-02 22:22:00,911 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:22:00,911 INFO L195 NwaCegarLoop]: trace histogram [382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:22:00,917 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-04-02 22:22:01,115 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 22:22:01,116 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:22:01,116 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:22:01,116 INFO L85 PathProgramCache]: Analyzing trace with hash 975835629, now seen corresponding path program 8 times [2023-04-02 22:22:01,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:22:01,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714647219] [2023-04-02 22:22:01,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:22:01,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:22:01,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:23:48,645 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:23:48,646 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:23:48,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714647219] [2023-04-02 22:23:48,646 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714647219] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:23:48,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331907213] [2023-04-02 22:23:48,646 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:23:48,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:23:48,646 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:23:48,648 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 22:23:48,649 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 22:23:51,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 192 check-sat command(s) [2023-04-02 22:23:51,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:23:51,661 INFO L262 TraceCheckSpWp]: Trace formula consists of 819 conjuncts, 384 conjunts are in the unsatisfiable core [2023-04-02 22:23:51,678 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:23:52,160 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:23:52,161 INFO L327 TraceCheckSpWp]: Computing backward predicates...