/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/in-de41.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:17:48,059 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:17:48,061 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:17:48,096 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:17:48,096 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:17:48,098 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:17:48,100 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:17:48,102 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:17:48,103 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:17:48,107 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:17:48,108 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:17:48,109 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:17:48,110 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:17:48,111 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:17:48,112 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:17:48,113 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:17:48,113 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:17:48,114 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:17:48,115 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:17:48,120 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:17:48,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:17:48,122 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:17:48,122 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:17:48,123 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:17:48,129 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:17:48,129 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:17:48,129 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:17:48,130 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:17:48,131 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:17:48,131 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:17:48,131 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:17:48,132 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:17:48,133 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:17:48,133 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:17:48,134 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:17:48,134 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:17:48,134 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:17:48,134 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:17:48,134 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:17:48,135 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:17:48,135 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:17:48,136 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 22:17:48,159 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:17:48,159 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:17:48,159 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:17:48,159 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:17:48,160 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:17:48,160 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:17:48,160 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:17:48,160 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:17:48,160 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:17:48,160 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:17:48,161 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:17:48,161 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:17:48,161 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:17:48,161 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:17:48,161 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:17:48,161 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:17:48,161 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:17:48,161 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:17:48,162 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:17:48,162 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:17:48,162 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:17:48,162 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:17:48,162 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:17:48,162 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:17:48,162 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:17:48,162 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:17:48,163 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:17:48,163 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:17:48,163 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:17:48,163 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:17:48,163 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:17:48,163 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:17:48,163 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:17:48,163 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:17:48,163 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:17:48,163 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:17:48,164 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:17:48,164 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:17:48,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:17:48,164 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:17:48,164 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:17:48,164 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:17:48,363 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:17:48,386 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:17:48,387 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:17:48,389 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:17:48,389 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:17:48,390 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/in-de41.c [2023-04-02 22:17:49,300 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:17:49,467 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:17:49,467 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/in-de41.c [2023-04-02 22:17:49,472 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c42df587/a68842f2103c423cad2673fa31cd0b65/FLAG59c4b9764 [2023-04-02 22:17:49,481 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c42df587/a68842f2103c423cad2673fa31cd0b65 [2023-04-02 22:17:49,483 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:17:49,484 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:17:49,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:17:49,485 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:17:49,487 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:17:49,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,488 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10d20a76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49, skipping insertion in model container [2023-04-02 22:17:49,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,493 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:17:49,504 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:17:49,583 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/in-de41.c[368,381] [2023-04-02 22:17:49,592 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:17:49,598 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:17:49,605 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/in-de41.c[368,381] [2023-04-02 22:17:49,611 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:17:49,619 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:17:49,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49 WrapperNode [2023-04-02 22:17:49,620 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:17:49,621 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:17:49,621 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:17:49,621 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:17:49,628 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,628 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,632 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,632 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,641 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,644 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,648 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,649 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,652 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:17:49,653 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:17:49,653 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:17:49,653 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:17:49,654 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (1/1) ... [2023-04-02 22:17:49,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:17:49,665 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:49,675 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 22:17:49,704 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:17:49,704 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:17:49,704 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:17:49,704 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:17:49,704 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:17:49,692 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 22:17:49,709 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:17:49,709 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:17:49,709 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:17:49,709 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:17:49,710 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:17:49,763 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:17:49,765 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:17:49,910 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:17:49,930 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:17:49,930 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-02 22:17:49,938 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:17:49 BoogieIcfgContainer [2023-04-02 22:17:49,938 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:17:49,955 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:17:49,956 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:17:49,958 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:17:49,958 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:17:49" (1/3) ... [2023-04-02 22:17:49,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cbb1655 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:17:49, skipping insertion in model container [2023-04-02 22:17:49,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:17:49" (2/3) ... [2023-04-02 22:17:49,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cbb1655 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:17:49, skipping insertion in model container [2023-04-02 22:17:49,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:17:49" (3/3) ... [2023-04-02 22:17:49,961 INFO L112 eAbstractionObserver]: Analyzing ICFG in-de41.c [2023-04-02 22:17:49,972 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:17:49,972 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:17:50,014 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:17:50,019 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;@fc3dc30, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:17:50,020 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:17:50,023 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 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 22:17:50,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-02 22:17:50,029 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:50,029 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:50,030 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:50,035 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:50,035 INFO L85 PathProgramCache]: Analyzing trace with hash 1715097009, now seen corresponding path program 1 times [2023-04-02 22:17:50,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:50,042 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086977755] [2023-04-02 22:17:50,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:50,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:50,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:50,597 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 22:17:50,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:50,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086977755] [2023-04-02 22:17:50,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086977755] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:17:50,599 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:17:50,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-04-02 22:17:50,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614646303] [2023-04-02 22:17:50,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:17:50,603 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 22:17:50,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:50,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 22:17:50,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-04-02 22:17:50,623 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 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 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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 22:17:50,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:50,709 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2023-04-02 22:17:50,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:17:50,711 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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 13 [2023-04-02 22:17:50,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:50,715 INFO L225 Difference]: With dead ends: 39 [2023-04-02 22:17:50,715 INFO L226 Difference]: Without dead ends: 18 [2023-04-02 22:17:50,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-04-02 22:17:50,720 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 10 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:50,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 45 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:17:50,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-04-02 22:17:50,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-04-02 22:17:50,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 states have internal predecessors, (20), 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 22:17:50,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 24 transitions. [2023-04-02 22:17:50,743 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 24 transitions. Word has length 13 [2023-04-02 22:17:50,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:50,743 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 24 transitions. [2023-04-02 22:17:50,743 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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 22:17:50,744 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 24 transitions. [2023-04-02 22:17:50,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 22:17:50,744 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:50,744 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:50,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:17:50,744 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:50,745 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:50,745 INFO L85 PathProgramCache]: Analyzing trace with hash -29163576, now seen corresponding path program 1 times [2023-04-02 22:17:50,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:50,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57381888] [2023-04-02 22:17:50,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:50,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:50,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:50,806 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 22:17:50,806 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:50,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57381888] [2023-04-02 22:17:50,807 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57381888] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:50,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573349731] [2023-04-02 22:17:50,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:50,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:50,807 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:50,810 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 22:17:50,811 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 22:17:50,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:50,845 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:17:50,848 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:50,886 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 22:17:50,886 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:50,921 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 22:17:50,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573349731] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:50,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1884200366] [2023-04-02 22:17:50,936 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:50,936 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:50,939 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:50,942 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:50,942 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:50,986 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:51,021 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 22:17:51,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:51,048 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:51,326 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '210#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:51,326 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:51,326 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:51,326 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-04-02 22:17:51,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372952595] [2023-04-02 22:17:51,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:51,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 22:17:51,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:51,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 22:17:51,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-04-02 22:17:51,328 INFO L87 Difference]: Start difference. First operand 18 states and 24 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 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 22:17:51,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:51,450 INFO L93 Difference]: Finished difference Result 50 states and 77 transitions. [2023-04-02 22:17:51,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:17:51,451 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 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 14 [2023-04-02 22:17:51,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:51,452 INFO L225 Difference]: With dead ends: 50 [2023-04-02 22:17:51,452 INFO L226 Difference]: Without dead ends: 43 [2023-04-02 22:17:51,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:17:51,453 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 41 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:51,454 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 41 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:17:51,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-04-02 22:17:51,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2023-04-02 22:17:51,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.5) internal successors, (36), 24 states have internal predecessors, (36), 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 22:17:51,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2023-04-02 22:17:51,461 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 14 [2023-04-02 22:17:51,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:51,461 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2023-04-02 22:17:51,461 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 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 22:17:51,461 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2023-04-02 22:17:51,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 22:17:51,461 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:51,461 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:51,469 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-02 22:17:51,666 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 22:17:51,667 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:51,667 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:51,667 INFO L85 PathProgramCache]: Analyzing trace with hash 665492143, now seen corresponding path program 1 times [2023-04-02 22:17:51,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:51,667 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976337347] [2023-04-02 22:17:51,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:51,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:51,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:51,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:17:51,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:51,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976337347] [2023-04-02 22:17:51,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976337347] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:17:51,688 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:17:51,688 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 22:17:51,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277924305] [2023-04-02 22:17:51,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:17:51,689 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 22:17:51,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:51,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 22:17:51,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:17:51,690 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 22:17:51,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:51,706 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2023-04-02 22:17:51,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 22:17:51,706 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 14 [2023-04-02 22:17:51,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:51,707 INFO L225 Difference]: With dead ends: 38 [2023-04-02 22:17:51,707 INFO L226 Difference]: Without dead ends: 30 [2023-04-02 22:17:51,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 22:17:51,708 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 20 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 22:17:51,708 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 20 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:17:51,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-04-02 22:17:51,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-04-02 22:17:51,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 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 22:17:51,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 42 transitions. [2023-04-02 22:17:51,713 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 42 transitions. Word has length 14 [2023-04-02 22:17:51,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:51,713 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 42 transitions. [2023-04-02 22:17:51,713 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 22:17:51,714 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 42 transitions. [2023-04-02 22:17:51,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 22:17:51,714 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:51,714 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:51,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-02 22:17:51,714 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:51,715 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:51,715 INFO L85 PathProgramCache]: Analyzing trace with hash 252696611, now seen corresponding path program 1 times [2023-04-02 22:17:51,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:51,715 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504392397] [2023-04-02 22:17:51,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:51,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:51,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:51,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:17:51,758 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:51,758 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504392397] [2023-04-02 22:17:51,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504392397] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:17:51,759 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:17:51,759 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 22:17:51,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402038816] [2023-04-02 22:17:51,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:17:51,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 22:17:51,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:51,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 22:17:51,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:17:51,760 INFO L87 Difference]: Start difference. First operand 30 states and 42 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 22:17:51,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:51,785 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2023-04-02 22:17:51,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:17:51,785 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 14 [2023-04-02 22:17:51,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:51,786 INFO L225 Difference]: With dead ends: 37 [2023-04-02 22:17:51,786 INFO L226 Difference]: Without dead ends: 28 [2023-04-02 22:17:51,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:17:51,788 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 1 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:51,789 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 26 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:17:51,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-02 22:17:51,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-04-02 22:17:51,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 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 22:17:51,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2023-04-02 22:17:51,803 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 14 [2023-04-02 22:17:51,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:51,803 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2023-04-02 22:17:51,803 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 22:17:51,803 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2023-04-02 22:17:51,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-02 22:17:51,804 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:51,804 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:51,804 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-02 22:17:51,804 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:51,804 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:51,804 INFO L85 PathProgramCache]: Analyzing trace with hash -648774591, now seen corresponding path program 1 times [2023-04-02 22:17:51,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:51,805 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695882531] [2023-04-02 22:17:51,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:51,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:51,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:51,914 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:17:51,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:51,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695882531] [2023-04-02 22:17:51,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695882531] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:51,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256591545] [2023-04-02 22:17:51,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:51,915 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:51,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:51,916 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 22:17:51,919 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 22:17:51,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:51,948 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 22:17:51,949 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:51,966 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:17:51,966 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:51,986 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:17:51,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256591545] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:51,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1110349673] [2023-04-02 22:17:51,987 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:51,987 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:51,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:51,988 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:51,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:52,005 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:52,044 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:17:52,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:52,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:52,251 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '724#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:52,252 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:52,252 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:52,252 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2023-04-02 22:17:52,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299942849] [2023-04-02 22:17:52,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:52,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 22:17:52,253 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:52,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 22:17:52,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2023-04-02 22:17:52,253 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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 22:17:52,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:52,287 INFO L93 Difference]: Finished difference Result 42 states and 57 transitions. [2023-04-02 22:17:52,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:17:52,288 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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 16 [2023-04-02 22:17:52,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:52,288 INFO L225 Difference]: With dead ends: 42 [2023-04-02 22:17:52,288 INFO L226 Difference]: Without dead ends: 37 [2023-04-02 22:17:52,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2023-04-02 22:17:52,289 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 4 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:52,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 28 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:17:52,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-04-02 22:17:52,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2023-04-02 22:17:52,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 31 states have internal predecessors, (46), 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 22:17:52,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 50 transitions. [2023-04-02 22:17:52,296 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 50 transitions. Word has length 16 [2023-04-02 22:17:52,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:52,296 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 50 transitions. [2023-04-02 22:17:52,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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 22:17:52,296 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 50 transitions. [2023-04-02 22:17:52,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-02 22:17:52,296 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:52,297 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:52,303 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 22:17:52,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:52,501 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:52,502 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:52,502 INFO L85 PathProgramCache]: Analyzing trace with hash 2078382961, now seen corresponding path program 2 times [2023-04-02 22:17:52,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:52,502 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673426257] [2023-04-02 22:17:52,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:52,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:52,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:52,569 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 22:17:52,570 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:52,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673426257] [2023-04-02 22:17:52,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673426257] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:52,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [896745007] [2023-04-02 22:17:52,570 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:17:52,570 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:52,570 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:52,571 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 22:17:52,573 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 22:17:52,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:17:52,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:17:52,604 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2023-04-02 22:17:52,605 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:52,632 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 22:17:52,632 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:52,696 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 22:17:52,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [896745007] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:52,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1915751476] [2023-04-02 22:17:52,698 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:52,698 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:52,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:52,699 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:52,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:52,715 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:52,740 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 22:17:52,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:52,761 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:53,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '993#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:53,070 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:53,070 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:53,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-04-02 22:17:53,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024802934] [2023-04-02 22:17:53,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:53,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:17:53,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:53,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:17:53,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2023-04-02 22:17:53,072 INFO L87 Difference]: Start difference. First operand 36 states and 50 transitions. Second operand has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 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 22:17:53,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:53,753 INFO L93 Difference]: Finished difference Result 129 states and 213 transitions. [2023-04-02 22:17:53,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-02 22:17:53,754 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 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 17 [2023-04-02 22:17:53,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:53,755 INFO L225 Difference]: With dead ends: 129 [2023-04-02 22:17:53,755 INFO L226 Difference]: Without dead ends: 118 [2023-04-02 22:17:53,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=339, Invalid=1301, Unknown=0, NotChecked=0, Total=1640 [2023-04-02 22:17:53,756 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 157 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:53,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 61 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:17:53,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2023-04-02 22:17:53,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 56. [2023-04-02 22:17:53,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.5098039215686274) internal successors, (77), 51 states have internal predecessors, (77), 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 22:17:53,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 81 transitions. [2023-04-02 22:17:53,768 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 81 transitions. Word has length 17 [2023-04-02 22:17:53,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:53,769 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 81 transitions. [2023-04-02 22:17:53,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 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 22:17:53,769 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 81 transitions. [2023-04-02 22:17:53,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-02 22:17:53,769 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:53,770 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:53,774 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 22:17:53,974 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:53,975 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:53,975 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:53,975 INFO L85 PathProgramCache]: Analyzing trace with hash 399916575, now seen corresponding path program 1 times [2023-04-02 22:17:53,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:53,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93314492] [2023-04-02 22:17:53,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:53,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:53,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:54,180 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:17:54,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:54,181 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93314492] [2023-04-02 22:17:54,181 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93314492] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:54,181 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935989203] [2023-04-02 22:17:54,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:54,181 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:54,181 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:54,182 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 22:17:54,185 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 22:17:54,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:54,217 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 23 conjunts are in the unsatisfiable core [2023-04-02 22:17:54,218 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:54,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:17:54,344 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:54,497 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:17:54,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935989203] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:54,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1144186564] [2023-04-02 22:17:54,499 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:54,499 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:54,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:54,499 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:54,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:54,516 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:54,555 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:17:54,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:54,566 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:54,839 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1513#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:54,839 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:54,840 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:54,840 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2023-04-02 22:17:54,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420013070] [2023-04-02 22:17:54,840 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:54,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-02 22:17:54,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:54,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-02 22:17:54,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=660, Unknown=0, NotChecked=0, Total=756 [2023-04-02 22:17:54,841 INFO L87 Difference]: Start difference. First operand 56 states and 81 transitions. Second operand has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:17:55,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:55,326 INFO L93 Difference]: Finished difference Result 84 states and 115 transitions. [2023-04-02 22:17:55,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 22:17:55,327 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2023-04-02 22:17:55,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:55,328 INFO L225 Difference]: With dead ends: 84 [2023-04-02 22:17:55,328 INFO L226 Difference]: Without dead ends: 79 [2023-04-02 22:17:55,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=182, Invalid=1150, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 22:17:55,329 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 15 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:55,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 45 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:17:55,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-04-02 22:17:55,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 62. [2023-04-02 22:17:55,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.4736842105263157) internal successors, (84), 57 states have internal predecessors, (84), 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 22:17:55,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 88 transitions. [2023-04-02 22:17:55,346 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 88 transitions. Word has length 17 [2023-04-02 22:17:55,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:55,346 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 88 transitions. [2023-04-02 22:17:55,346 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.631578947368421) internal successors, (31), 17 states have internal predecessors, (31), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:17:55,346 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 88 transitions. [2023-04-02 22:17:55,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-02 22:17:55,347 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:55,347 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:55,354 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 22:17:55,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:55,555 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:55,555 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:55,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1178152037, now seen corresponding path program 2 times [2023-04-02 22:17:55,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:55,555 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60081154] [2023-04-02 22:17:55,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:55,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:55,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:55,605 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:17:55,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:55,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60081154] [2023-04-02 22:17:55,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60081154] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:55,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062061675] [2023-04-02 22:17:55,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:17:55,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:55,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:55,607 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 22:17:55,609 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 22:17:55,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:17:55,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:17:55,638 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 22:17:55,639 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:55,669 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:17:55,669 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:55,721 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 22:17:55,721 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062061675] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:55,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1531815690] [2023-04-02 22:17:55,722 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:55,723 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:55,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:55,723 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:55,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:55,739 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:55,769 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:17:55,778 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:55,782 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:55,997 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1932#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:55,997 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:55,997 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:55,997 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-04-02 22:17:55,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535304143] [2023-04-02 22:17:55,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:55,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 22:17:55,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:55,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 22:17:55,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:17:55,999 INFO L87 Difference]: Start difference. First operand 62 states and 88 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 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 22:17:56,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:56,138 INFO L93 Difference]: Finished difference Result 90 states and 125 transitions. [2023-04-02 22:17:56,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 22:17:56,140 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 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 17 [2023-04-02 22:17:56,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:56,144 INFO L225 Difference]: With dead ends: 90 [2023-04-02 22:17:56,144 INFO L226 Difference]: Without dead ends: 78 [2023-04-02 22:17:56,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:17:56,145 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 28 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:56,146 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 54 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:17:56,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-04-02 22:17:56,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 62. [2023-04-02 22:17:56,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.456140350877193) internal successors, (83), 57 states have internal predecessors, (83), 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 22:17:56,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 87 transitions. [2023-04-02 22:17:56,171 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 87 transitions. Word has length 17 [2023-04-02 22:17:56,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:56,171 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 87 transitions. [2023-04-02 22:17:56,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 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 22:17:56,171 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 87 transitions. [2023-04-02 22:17:56,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-02 22:17:56,173 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:56,173 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:56,181 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 22:17:56,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:56,380 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:56,380 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:56,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1450395647, now seen corresponding path program 2 times [2023-04-02 22:17:56,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:56,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693649901] [2023-04-02 22:17:56,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:56,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:56,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:56,443 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:17:56,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:56,443 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693649901] [2023-04-02 22:17:56,443 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693649901] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:56,443 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657025036] [2023-04-02 22:17:56,443 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:17:56,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:56,444 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:56,444 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 22:17:56,446 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 22:17:56,475 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:17:56,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:17:56,476 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 22:17:56,477 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:56,492 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:17:56,492 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:56,508 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:17:56,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657025036] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:56,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2108626207] [2023-04-02 22:17:56,510 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:56,510 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:56,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:56,511 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:56,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:56,524 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:56,566 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:17:56,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:56,583 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:56,748 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2353#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:56,748 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:56,748 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:56,748 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2023-04-02 22:17:56,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484126636] [2023-04-02 22:17:56,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:56,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 22:17:56,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:56,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 22:17:56,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2023-04-02 22:17:56,750 INFO L87 Difference]: Start difference. First operand 62 states and 87 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 22:17:56,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:56,790 INFO L93 Difference]: Finished difference Result 70 states and 96 transitions. [2023-04-02 22:17:56,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:17:56,791 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 18 [2023-04-02 22:17:56,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:56,791 INFO L225 Difference]: With dead ends: 70 [2023-04-02 22:17:56,791 INFO L226 Difference]: Without dead ends: 58 [2023-04-02 22:17:56,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2023-04-02 22:17:56,793 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 4 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:56,794 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 28 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:17:56,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-04-02 22:17:56,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2023-04-02 22:17:56,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.4807692307692308) internal successors, (77), 52 states have internal predecessors, (77), 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 22:17:56,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 81 transitions. [2023-04-02 22:17:56,815 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 81 transitions. Word has length 18 [2023-04-02 22:17:56,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:56,815 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 81 transitions. [2023-04-02 22:17:56,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 22:17:56,816 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 81 transitions. [2023-04-02 22:17:56,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 22:17:56,816 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:56,816 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:56,823 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 22:17:57,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:57,021 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:57,022 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:57,022 INFO L85 PathProgramCache]: Analyzing trace with hash 443274365, now seen corresponding path program 3 times [2023-04-02 22:17:57,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:57,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501337064] [2023-04-02 22:17:57,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:57,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:57,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:57,117 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:17:57,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:57,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501337064] [2023-04-02 22:17:57,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501337064] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:57,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035906525] [2023-04-02 22:17:57,118 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:17:57,118 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:57,118 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:57,119 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 22:17:57,122 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 22:17:57,153 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:17:57,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:17:57,154 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 22:17:57,155 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:57,185 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:17:57,186 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:57,242 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:17:57,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035906525] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:57,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1238531313] [2023-04-02 22:17:57,244 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:57,244 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:57,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:57,244 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:57,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:57,256 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:57,306 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:17:57,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:57,318 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:57,532 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2729#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:57,532 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:57,532 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:57,532 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 13 [2023-04-02 22:17:57,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486743039] [2023-04-02 22:17:57,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:57,533 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-02 22:17:57,533 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:57,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-02 22:17:57,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:17:57,534 INFO L87 Difference]: Start difference. First operand 57 states and 81 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 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 22:17:57,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:57,715 INFO L93 Difference]: Finished difference Result 91 states and 125 transitions. [2023-04-02 22:17:57,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 22:17:57,715 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 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 19 [2023-04-02 22:17:57,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:57,716 INFO L225 Difference]: With dead ends: 91 [2023-04-02 22:17:57,716 INFO L226 Difference]: Without dead ends: 74 [2023-04-02 22:17:57,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2023-04-02 22:17:57,717 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 21 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:57,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 47 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:17:57,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-04-02 22:17:57,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 55. [2023-04-02 22:17:57,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.46) internal successors, (73), 50 states have internal predecessors, (73), 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 22:17:57,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 77 transitions. [2023-04-02 22:17:57,735 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 77 transitions. Word has length 19 [2023-04-02 22:17:57,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:57,735 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 77 transitions. [2023-04-02 22:17:57,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 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 22:17:57,735 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 77 transitions. [2023-04-02 22:17:57,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 22:17:57,736 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:57,736 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:57,742 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 22:17:57,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:57,941 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:57,941 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:57,941 INFO L85 PathProgramCache]: Analyzing trace with hash -511235023, now seen corresponding path program 3 times [2023-04-02 22:17:57,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:57,941 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021023344] [2023-04-02 22:17:57,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:57,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:57,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:58,013 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:17:58,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:58,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021023344] [2023-04-02 22:17:58,013 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021023344] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:58,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020851771] [2023-04-02 22:17:58,013 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:17:58,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:58,014 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:58,015 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 22:17:58,016 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 22:17:58,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:17:58,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:17:58,047 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 22:17:58,049 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:58,076 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:17:58,076 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:58,107 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:17:58,107 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020851771] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:58,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1014547401] [2023-04-02 22:17:58,109 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:58,109 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:58,110 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:58,110 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:58,110 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:58,122 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:58,154 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:17:58,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:58,172 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:58,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3144#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:58,391 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:58,392 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:58,392 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 8 [2023-04-02 22:17:58,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050595691] [2023-04-02 22:17:58,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:58,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 22:17:58,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:58,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 22:17:58,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-04-02 22:17:58,393 INFO L87 Difference]: Start difference. First operand 55 states and 77 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 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 22:17:58,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:17:58,492 INFO L93 Difference]: Finished difference Result 77 states and 108 transitions. [2023-04-02 22:17:58,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:17:58,492 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 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 19 [2023-04-02 22:17:58,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:17:58,493 INFO L225 Difference]: With dead ends: 77 [2023-04-02 22:17:58,493 INFO L226 Difference]: Without dead ends: 72 [2023-04-02 22:17:58,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-04-02 22:17:58,494 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 14 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:17:58,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 48 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:17:58,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-04-02 22:17:58,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2023-04-02 22:17:58,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.4461538461538461) internal successors, (94), 65 states have internal predecessors, (94), 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 22:17:58,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 98 transitions. [2023-04-02 22:17:58,523 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 98 transitions. Word has length 19 [2023-04-02 22:17:58,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:17:58,523 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 98 transitions. [2023-04-02 22:17:58,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 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 22:17:58,524 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 98 transitions. [2023-04-02 22:17:58,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:17:58,524 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:17:58,524 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:17:58,531 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 22:17:58,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-02 22:17:58,731 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:17:58,732 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:17:58,732 INFO L85 PathProgramCache]: Analyzing trace with hash 1235266527, now seen corresponding path program 4 times [2023-04-02 22:17:58,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:17:58,732 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895923188] [2023-04-02 22:17:58,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:17:58,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:17:58,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:58,819 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:17:58,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:17:58,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895923188] [2023-04-02 22:17:58,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895923188] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:17:58,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539407627] [2023-04-02 22:17:58,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:17:58,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:17:58,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:17:58,821 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:17:58,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 22:17:58,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:17:58,854 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 17 conjunts are in the unsatisfiable core [2023-04-02 22:17:58,856 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:17:58,879 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:17:58,879 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:17:58,987 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:17:58,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539407627] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:17:58,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489897049] [2023-04-02 22:17:58,988 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:17:58,988 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:17:58,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:17:58,989 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:17:58,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:17:59,012 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:17:59,040 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:17:59,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:17:59,049 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:17:59,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3579#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:17:59,297 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:17:59,297 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:17:59,297 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2023-04-02 22:17:59,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742339771] [2023-04-02 22:17:59,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:17:59,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-02 22:17:59,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:17:59,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-02 22:17:59,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=651, Unknown=0, NotChecked=0, Total=756 [2023-04-02 22:17:59,299 INFO L87 Difference]: Start difference. First operand 70 states and 98 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 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 22:18:01,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:01,977 INFO L93 Difference]: Finished difference Result 205 states and 296 transitions. [2023-04-02 22:18:01,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-04-02 22:18:01,977 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 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 22:18:01,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:01,978 INFO L225 Difference]: With dead ends: 205 [2023-04-02 22:18:01,978 INFO L226 Difference]: Without dead ends: 179 [2023-04-02 22:18:01,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1707 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1176, Invalid=4374, Unknown=0, NotChecked=0, Total=5550 [2023-04-02 22:18:01,980 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 251 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 524 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 524 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:01,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 77 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 524 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 22:18:01,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-04-02 22:18:02,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 79. [2023-04-02 22:18:02,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.4189189189189189) internal successors, (105), 74 states have internal predecessors, (105), 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 22:18:02,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 109 transitions. [2023-04-02 22:18:02,010 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 109 transitions. Word has length 21 [2023-04-02 22:18:02,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:02,011 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 109 transitions. [2023-04-02 22:18:02,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 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 22:18:02,011 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 109 transitions. [2023-04-02 22:18:02,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:18:02,011 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:02,011 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:02,017 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-04-02 22:18:02,216 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:02,216 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:02,217 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:02,217 INFO L85 PathProgramCache]: Analyzing trace with hash 1876110321, now seen corresponding path program 5 times [2023-04-02 22:18:02,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:02,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47678890] [2023-04-02 22:18:02,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:02,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:02,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:02,488 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:18:02,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:02,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47678890] [2023-04-02 22:18:02,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47678890] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:02,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619529152] [2023-04-02 22:18:02,488 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:18:02,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:02,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:02,490 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:02,492 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 22:18:02,536 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:18:02,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:18:02,537 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 35 conjunts are in the unsatisfiable core [2023-04-02 22:18:02,538 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:02,783 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:18:02,784 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:03,000 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:18:03,001 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619529152] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:03,001 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010735985] [2023-04-02 22:18:03,002 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:03,002 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:03,002 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:03,002 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:03,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:03,016 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:03,065 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:18:03,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:03,074 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:03,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4387#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:03,386 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:03,386 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:03,387 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 10] total 25 [2023-04-02 22:18:03,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451989886] [2023-04-02 22:18:03,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:03,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 22:18:03,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:03,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 22:18:03,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=992, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:18:03,388 INFO L87 Difference]: Start difference. First operand 79 states and 109 transitions. Second operand has 25 states, 25 states have (on average 1.64) internal successors, (41), 23 states have internal predecessors, (41), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:18:04,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:04,222 INFO L93 Difference]: Finished difference Result 113 states and 148 transitions. [2023-04-02 22:18:04,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-04-02 22:18:04,222 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 23 states have internal predecessors, (41), 3 states have call successors, (4), 3 states have call predecessors, (4), 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 22:18:04,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:04,223 INFO L225 Difference]: With dead ends: 113 [2023-04-02 22:18:04,223 INFO L226 Difference]: Without dead ends: 97 [2023-04-02 22:18:04,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 22:18:04,224 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:04,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 86 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 22:18:04,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-04-02 22:18:04,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 84. [2023-04-02 22:18:04,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.4050632911392404) internal successors, (111), 79 states have internal predecessors, (111), 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 22:18:04,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 115 transitions. [2023-04-02 22:18:04,257 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 115 transitions. Word has length 21 [2023-04-02 22:18:04,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:04,257 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 115 transitions. [2023-04-02 22:18:04,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 23 states have internal predecessors, (41), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:18:04,258 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 115 transitions. [2023-04-02 22:18:04,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:18:04,258 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:04,258 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:04,266 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 22:18:04,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 22:18:04,463 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:04,463 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:04,463 INFO L85 PathProgramCache]: Analyzing trace with hash 1396580977, now seen corresponding path program 4 times [2023-04-02 22:18:04,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:04,463 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752161992] [2023-04-02 22:18:04,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:04,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:04,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:04,520 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:18:04,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:04,520 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752161992] [2023-04-02 22:18:04,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752161992] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:04,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056068426] [2023-04-02 22:18:04,521 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:18:04,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:04,521 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:04,522 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:04,524 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 22:18:04,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:04,553 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 22:18:04,554 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:04,596 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:18:04,596 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:04,671 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:18:04,671 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056068426] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:04,671 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1292102332] [2023-04-02 22:18:04,672 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:04,672 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:04,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:04,673 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:04,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:04,684 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:04,705 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:18:04,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:04,715 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:04,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4942#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:04,955 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:04,955 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:04,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-04-02 22:18:04,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44365922] [2023-04-02 22:18:04,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:04,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 22:18:04,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:04,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 22:18:04,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:18:04,957 INFO L87 Difference]: Start difference. First operand 84 states and 115 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 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 22:18:05,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:05,144 INFO L93 Difference]: Finished difference Result 105 states and 140 transitions. [2023-04-02 22:18:05,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 22:18:05,145 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 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 22:18:05,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:05,145 INFO L225 Difference]: With dead ends: 105 [2023-04-02 22:18:05,146 INFO L226 Difference]: Without dead ends: 87 [2023-04-02 22:18:05,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=134, Invalid=736, Unknown=0, NotChecked=0, Total=870 [2023-04-02 22:18:05,146 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 25 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:05,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 50 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:18:05,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-04-02 22:18:05,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 76. [2023-04-02 22:18:05,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.3943661971830985) internal successors, (99), 71 states have internal predecessors, (99), 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 22:18:05,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 103 transitions. [2023-04-02 22:18:05,179 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 103 transitions. Word has length 21 [2023-04-02 22:18:05,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:05,180 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 103 transitions. [2023-04-02 22:18:05,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 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 22:18:05,180 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 103 transitions. [2023-04-02 22:18:05,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-02 22:18:05,182 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:05,182 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:05,191 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 22:18:05,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 22:18:05,387 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:05,387 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:05,387 INFO L85 PathProgramCache]: Analyzing trace with hash 178850625, now seen corresponding path program 5 times [2023-04-02 22:18:05,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:05,388 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365262709] [2023-04-02 22:18:05,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:05,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:05,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:05,464 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:18:05,465 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:05,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365262709] [2023-04-02 22:18:05,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [365262709] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:05,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264851496] [2023-04-02 22:18:05,465 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:18:05,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:05,465 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:05,466 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:05,468 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 22:18:05,499 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:18:05,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:18:05,500 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 22:18:05,501 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:05,539 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:18:05,540 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:05,573 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:18:05,573 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264851496] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:05,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1617059227] [2023-04-02 22:18:05,574 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:05,574 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:05,574 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:05,574 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:05,575 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:05,584 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:05,605 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:18:05,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:05,614 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:05,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5451#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:05,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:05,818 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:05,818 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 11 [2023-04-02 22:18:05,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032326208] [2023-04-02 22:18:05,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:05,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 22:18:05,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:05,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 22:18:05,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2023-04-02 22:18:05,820 INFO L87 Difference]: Start difference. First operand 76 states and 103 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 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 22:18:05,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:05,944 INFO L93 Difference]: Finished difference Result 101 states and 139 transitions. [2023-04-02 22:18:05,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:18:05,945 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 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 22 [2023-04-02 22:18:05,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:05,946 INFO L225 Difference]: With dead ends: 101 [2023-04-02 22:18:05,946 INFO L226 Difference]: Without dead ends: 96 [2023-04-02 22:18:05,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2023-04-02 22:18:05,948 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 14 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:05,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 81 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:18:05,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-04-02 22:18:05,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2023-04-02 22:18:05,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.3953488372093024) internal successors, (120), 86 states have internal predecessors, (120), 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 22:18:05,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 124 transitions. [2023-04-02 22:18:05,979 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 124 transitions. Word has length 22 [2023-04-02 22:18:05,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:05,979 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 124 transitions. [2023-04-02 22:18:05,979 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 11 states have internal predecessors, (26), 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 22:18:05,979 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 124 transitions. [2023-04-02 22:18:05,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-02 22:18:05,979 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:05,980 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:05,984 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-04-02 22:18:06,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-02 22:18:06,184 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:06,184 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:06,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1467995547, now seen corresponding path program 6 times [2023-04-02 22:18:06,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:06,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854733071] [2023-04-02 22:18:06,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:06,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:06,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:06,266 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 22:18:06,266 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:06,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854733071] [2023-04-02 22:18:06,266 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854733071] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:06,266 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131117371] [2023-04-02 22:18:06,267 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:18:06,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:06,267 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:06,268 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:06,273 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 22:18:06,304 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:18:06,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:18:06,305 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-02 22:18:06,305 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:06,357 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 22:18:06,357 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:06,438 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 22:18:06,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1131117371] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:06,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407120774] [2023-04-02 22:18:06,439 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:06,439 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:06,439 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:06,440 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:06,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:06,454 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:06,479 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:18:06,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:06,487 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:06,730 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5987#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:06,730 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:06,730 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:06,730 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 18 [2023-04-02 22:18:06,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102213134] [2023-04-02 22:18:06,731 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:06,731 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-02 22:18:06,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:06,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-02 22:18:06,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:18:06,732 INFO L87 Difference]: Start difference. First operand 91 states and 124 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 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 22:18:07,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:07,157 INFO L93 Difference]: Finished difference Result 142 states and 187 transitions. [2023-04-02 22:18:07,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-02 22:18:07,158 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 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 23 [2023-04-02 22:18:07,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:07,159 INFO L225 Difference]: With dead ends: 142 [2023-04-02 22:18:07,159 INFO L226 Difference]: Without dead ends: 125 [2023-04-02 22:18:07,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=135, Invalid=921, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 22:18:07,159 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:07,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 81 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 427 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:18:07,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-04-02 22:18:07,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 88. [2023-04-02 22:18:07,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.3734939759036144) internal successors, (114), 83 states have internal predecessors, (114), 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 22:18:07,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2023-04-02 22:18:07,189 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 23 [2023-04-02 22:18:07,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:07,189 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2023-04-02 22:18:07,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 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 22:18:07,190 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2023-04-02 22:18:07,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-02 22:18:07,190 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:07,190 INFO L195 NwaCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:07,195 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 22:18:07,394 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-04-02 22:18:07,394 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:07,394 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:07,395 INFO L85 PathProgramCache]: Analyzing trace with hash 740273512, now seen corresponding path program 3 times [2023-04-02 22:18:07,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:07,395 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780269581] [2023-04-02 22:18:07,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:07,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:07,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:07,567 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:18:07,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:07,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780269581] [2023-04-02 22:18:07,568 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [780269581] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:07,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925830945] [2023-04-02 22:18:07,568 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:18:07,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:07,568 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:07,569 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:07,570 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 22:18:07,603 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:18:07,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:18:07,604 INFO L262 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 27 conjunts are in the unsatisfiable core [2023-04-02 22:18:07,606 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:07,645 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:18:07,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:07,879 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:18:07,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925830945] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:07,880 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1926973322] [2023-04-02 22:18:07,881 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:07,881 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:07,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:07,881 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:07,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:07,894 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:07,910 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2023-04-02 22:18:07,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:07,926 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:08,312 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6627#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:08,312 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:08,312 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:08,312 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2023-04-02 22:18:08,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127743578] [2023-04-02 22:18:08,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:08,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-02 22:18:08,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:08,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-02 22:18:08,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=1163, Unknown=0, NotChecked=0, Total=1406 [2023-04-02 22:18:08,314 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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 22:18:33,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:33,408 INFO L93 Difference]: Finished difference Result 464 states and 678 transitions. [2023-04-02 22:18:33,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2023-04-02 22:18:33,409 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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 24 [2023-04-02 22:18:33,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:33,410 INFO L225 Difference]: With dead ends: 464 [2023-04-02 22:18:33,410 INFO L226 Difference]: Without dead ends: 430 [2023-04-02 22:18:33,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1654 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=1627, Invalid=4853, Unknown=0, NotChecked=0, Total=6480 [2023-04-02 22:18:33,412 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 823 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 1330 mSolverCounterSat, 428 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 823 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 1758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 428 IncrementalHoareTripleChecker+Valid, 1330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:33,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [823 Valid, 116 Invalid, 1758 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [428 Valid, 1330 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-04-02 22:18:33,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2023-04-02 22:18:33,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 141. [2023-04-02 22:18:33,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.4044117647058822) internal successors, (191), 136 states have internal predecessors, (191), 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 22:18:33,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 195 transitions. [2023-04-02 22:18:33,466 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 195 transitions. Word has length 24 [2023-04-02 22:18:33,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:33,466 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 195 transitions. [2023-04-02 22:18:33,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 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 22:18:33,466 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 195 transitions. [2023-04-02 22:18:33,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 22:18:33,466 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:33,466 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:33,471 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 22:18:33,667 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:33,667 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:33,667 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:33,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1868535119, now seen corresponding path program 6 times [2023-04-02 22:18:33,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:33,668 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141967193] [2023-04-02 22:18:33,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:33,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:33,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:33,791 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 22:18:33,791 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:33,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141967193] [2023-04-02 22:18:33,792 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2141967193] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:33,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890461093] [2023-04-02 22:18:33,792 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:18:33,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:33,792 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:33,793 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:33,798 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 22:18:33,830 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:18:33,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:18:33,831 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 22:18:33,831 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:33,887 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 22:18:33,887 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:33,919 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 22:18:33,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890461093] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:33,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [172872576] [2023-04-02 22:18:33,920 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:33,921 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:33,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:33,921 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:33,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:33,940 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:33,962 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:18:33,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:33,971 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:34,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8082#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:34,191 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:34,191 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:34,191 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 14 [2023-04-02 22:18:34,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630440223] [2023-04-02 22:18:34,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:34,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 22:18:34,191 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:34,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 22:18:34,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2023-04-02 22:18:34,192 INFO L87 Difference]: Start difference. First operand 141 states and 195 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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 22:18:34,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:34,375 INFO L93 Difference]: Finished difference Result 181 states and 254 transitions. [2023-04-02 22:18:34,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:18:34,375 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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 25 [2023-04-02 22:18:34,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:34,376 INFO L225 Difference]: With dead ends: 181 [2023-04-02 22:18:34,376 INFO L226 Difference]: Without dead ends: 176 [2023-04-02 22:18:34,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2023-04-02 22:18:34,377 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 33 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:34,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 87 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:18:34,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2023-04-02 22:18:34,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 169. [2023-04-02 22:18:34,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.4085365853658536) internal successors, (231), 164 states have internal predecessors, (231), 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 22:18:34,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 235 transitions. [2023-04-02 22:18:34,447 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 235 transitions. Word has length 25 [2023-04-02 22:18:34,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:34,447 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 235 transitions. [2023-04-02 22:18:34,447 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 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 22:18:34,447 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 235 transitions. [2023-04-02 22:18:34,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 22:18:34,448 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:34,448 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:34,452 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-04-02 22:18:34,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-04-02 22:18:34,649 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:34,649 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:34,650 INFO L85 PathProgramCache]: Analyzing trace with hash -304968865, now seen corresponding path program 7 times [2023-04-02 22:18:34,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:34,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259106501] [2023-04-02 22:18:34,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:34,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:34,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:34,987 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:18:34,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:34,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259106501] [2023-04-02 22:18:34,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259106501] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:34,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326080898] [2023-04-02 22:18:34,987 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:18:34,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:34,987 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:34,989 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:35,019 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 22:18:35,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:35,075 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-02 22:18:35,076 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:35,728 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:18:35,729 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:36,082 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 22:18:36,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1326080898] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:36,083 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1562998001] [2023-04-02 22:18:36,084 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:36,084 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:36,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:36,084 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:36,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:36,094 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:36,118 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:18:36,124 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:36,131 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:36,511 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8961#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:36,511 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:36,511 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:36,511 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 18, 13] total 33 [2023-04-02 22:18:36,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998316774] [2023-04-02 22:18:36,511 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:36,512 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-04-02 22:18:36,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:36,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-04-02 22:18:36,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1529, Unknown=0, NotChecked=0, Total=1722 [2023-04-02 22:18:36,513 INFO L87 Difference]: Start difference. First operand 169 states and 235 transitions. Second operand has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 31 states have internal predecessors, (51), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:18:38,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:38,571 INFO L93 Difference]: Finished difference Result 265 states and 339 transitions. [2023-04-02 22:18:38,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-04-02 22:18:38,571 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 31 states have internal predecessors, (51), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-04-02 22:18:38,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:38,572 INFO L225 Difference]: With dead ends: 265 [2023-04-02 22:18:38,572 INFO L226 Difference]: Without dead ends: 247 [2023-04-02 22:18:38,573 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 916 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=458, Invalid=3324, Unknown=0, NotChecked=0, Total=3782 [2023-04-02 22:18:38,573 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 31 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:38,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 94 Invalid, 733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 691 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-04-02 22:18:38,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2023-04-02 22:18:38,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 176. [2023-04-02 22:18:38,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 171 states have (on average 1.4035087719298245) internal successors, (240), 171 states have internal predecessors, (240), 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 22:18:38,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 244 transitions. [2023-04-02 22:18:38,652 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 244 transitions. Word has length 25 [2023-04-02 22:18:38,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:38,652 INFO L495 AbstractCegarLoop]: Abstraction has 176 states and 244 transitions. [2023-04-02 22:18:38,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 31 states have internal predecessors, (51), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:18:38,653 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 244 transitions. [2023-04-02 22:18:38,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 22:18:38,653 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:38,653 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:38,658 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-04-02 22:18:38,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:38,857 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:38,857 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:38,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1169112741, now seen corresponding path program 7 times [2023-04-02 22:18:38,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:38,857 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087625785] [2023-04-02 22:18:38,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:38,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:38,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:38,957 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 22:18:38,957 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:38,957 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087625785] [2023-04-02 22:18:38,957 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1087625785] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:38,957 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487283523] [2023-04-02 22:18:38,957 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:18:38,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:38,958 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:38,958 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:38,960 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-04-02 22:18:38,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:38,993 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 22:18:38,994 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:39,064 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 22:18:39,064 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:39,192 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 22:18:39,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487283523] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:39,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [496482670] [2023-04-02 22:18:39,193 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:39,193 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:39,193 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:39,194 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:39,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:39,205 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:39,228 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:18:39,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:39,241 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:39,528 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10049#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:39,528 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:39,528 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:39,528 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 22 [2023-04-02 22:18:39,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34896847] [2023-04-02 22:18:39,528 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:39,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-04-02 22:18:39,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:39,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-04-02 22:18:39,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=849, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:18:39,529 INFO L87 Difference]: Start difference. First operand 176 states and 244 transitions. Second operand has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 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 22:18:39,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:39,957 INFO L93 Difference]: Finished difference Result 273 states and 347 transitions. [2023-04-02 22:18:39,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 22:18:39,958 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 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 25 [2023-04-02 22:18:39,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:39,959 INFO L225 Difference]: With dead ends: 273 [2023-04-02 22:18:39,959 INFO L226 Difference]: Without dead ends: 248 [2023-04-02 22:18:39,960 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=218, Invalid=1188, Unknown=0, NotChecked=0, Total=1406 [2023-04-02 22:18:39,961 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 43 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:39,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 82 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:18:39,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2023-04-02 22:18:40,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 165. [2023-04-02 22:18:40,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.4) internal successors, (224), 160 states have internal predecessors, (224), 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 22:18:40,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 228 transitions. [2023-04-02 22:18:40,045 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 228 transitions. Word has length 25 [2023-04-02 22:18:40,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:40,045 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 228 transitions. [2023-04-02 22:18:40,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 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 22:18:40,045 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 228 transitions. [2023-04-02 22:18:40,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-02 22:18:40,045 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:40,045 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:40,050 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-04-02 22:18:40,246 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:40,246 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:40,246 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:40,246 INFO L85 PathProgramCache]: Analyzing trace with hash -608436317, now seen corresponding path program 8 times [2023-04-02 22:18:40,246 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:40,246 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643084903] [2023-04-02 22:18:40,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:40,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:40,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:40,360 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 22:18:40,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:40,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643084903] [2023-04-02 22:18:40,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643084903] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:40,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155623217] [2023-04-02 22:18:40,360 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:18:40,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:40,361 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:40,361 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:40,362 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-04-02 22:18:40,403 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 22:18:40,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:18:40,404 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-02 22:18:40,405 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:40,490 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 22:18:40,490 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:40,657 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 22:18:40,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155623217] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:40,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1261809143] [2023-04-02 22:18:40,658 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:40,658 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:40,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:40,658 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:40,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:40,667 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:40,688 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:18:40,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:40,705 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:41,026 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11119#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:41,026 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:41,026 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:41,026 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 27 [2023-04-02 22:18:41,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35010847] [2023-04-02 22:18:41,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:41,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-02 22:18:41,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:41,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-02 22:18:41,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1146, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 22:18:41,029 INFO L87 Difference]: Start difference. First operand 165 states and 228 transitions. Second operand has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 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 22:18:42,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:18:42,170 INFO L93 Difference]: Finished difference Result 307 states and 385 transitions. [2023-04-02 22:18:42,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2023-04-02 22:18:42,180 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 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 26 [2023-04-02 22:18:42,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:18:42,181 INFO L225 Difference]: With dead ends: 307 [2023-04-02 22:18:42,181 INFO L226 Difference]: Without dead ends: 286 [2023-04-02 22:18:42,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 790 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=551, Invalid=2871, Unknown=0, NotChecked=0, Total=3422 [2023-04-02 22:18:42,183 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 94 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:18:42,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 123 Invalid, 600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 22:18:42,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2023-04-02 22:18:42,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 168. [2023-04-02 22:18:42,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 163 states have (on average 1.3803680981595092) internal successors, (225), 163 states have internal predecessors, (225), 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 22:18:42,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 229 transitions. [2023-04-02 22:18:42,269 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 229 transitions. Word has length 26 [2023-04-02 22:18:42,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:18:42,269 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 229 transitions. [2023-04-02 22:18:42,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 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 22:18:42,269 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 229 transitions. [2023-04-02 22:18:42,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-02 22:18:42,270 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:18:42,270 INFO L195 NwaCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:18:42,274 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-04-02 22:18:42,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:42,473 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:18:42,473 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:18:42,473 INFO L85 PathProgramCache]: Analyzing trace with hash -1475941802, now seen corresponding path program 8 times [2023-04-02 22:18:42,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:18:42,473 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433220116] [2023-04-02 22:18:42,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:18:42,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:18:42,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:18:42,673 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 79 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:18:42,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:18:42,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433220116] [2023-04-02 22:18:42,673 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433220116] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:18:42,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280263847] [2023-04-02 22:18:42,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:18:42,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:18:42,674 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:18:42,675 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:18:42,696 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-04-02 22:18:42,779 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 22:18:42,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:18:42,781 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 31 conjunts are in the unsatisfiable core [2023-04-02 22:18:42,782 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:18:42,824 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 79 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:18:42,824 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:18:43,126 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 79 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 22:18:43,126 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280263847] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:18:43,126 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [931057146] [2023-04-02 22:18:43,127 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:18:43,127 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:18:43,127 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:18:43,127 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:18:43,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:18:43,140 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:18:43,177 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:18:43,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:18:43,185 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:18:43,515 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12314#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:18:43,515 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:18:43,515 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:18:43,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2023-04-02 22:18:43,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107904868] [2023-04-02 22:18:43,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:18:43,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-04-02 22:18:43,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:18:43,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-04-02 22:18:43,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1456, Unknown=0, NotChecked=0, Total=1722 [2023-04-02 22:18:43,517 INFO L87 Difference]: Start difference. First operand 168 states and 229 transitions. Second operand has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 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 22:19:09,082 WARN L223 SmtUtils]: Spent 5.02s on a formula simplification that was a NOOP. DAG size: 56 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 22:20:21,707 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-04-02 22:20:30,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:30,773 INFO L93 Difference]: Finished difference Result 622 states and 857 transitions. [2023-04-02 22:20:30,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2023-04-02 22:20:30,775 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 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 28 [2023-04-02 22:20:30,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:30,777 INFO L225 Difference]: With dead ends: 622 [2023-04-02 22:20:30,777 INFO L226 Difference]: Without dead ends: 591 [2023-04-02 22:20:30,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7709 ImplicationChecksByTransitivity, 98.7s TimeCoverageRelationStatistics Valid=5110, Invalid=16060, Unknown=0, NotChecked=0, Total=21170 [2023-04-02 22:20:30,781 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 1188 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 1802 mSolverCounterSat, 687 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1188 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 2489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 687 IncrementalHoareTripleChecker+Valid, 1802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:30,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1188 Valid, 127 Invalid, 2489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [687 Valid, 1802 Invalid, 0 Unknown, 0 Unchecked, 8.8s Time] [2023-04-02 22:20:30,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2023-04-02 22:20:30,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 180. [2023-04-02 22:20:30,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.3771428571428572) internal successors, (241), 175 states have internal predecessors, (241), 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 22:20:30,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 245 transitions. [2023-04-02 22:20:30,884 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 245 transitions. Word has length 28 [2023-04-02 22:20:30,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:30,885 INFO L495 AbstractCegarLoop]: Abstraction has 180 states and 245 transitions. [2023-04-02 22:20:30,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 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 22:20:30,885 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 245 transitions. [2023-04-02 22:20:30,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-02 22:20:30,885 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:30,885 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:30,890 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-04-02 22:20:31,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:31,086 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:31,086 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:31,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1982364225, now seen corresponding path program 9 times [2023-04-02 22:20:31,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:31,086 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781089642] [2023-04-02 22:20:31,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:31,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:31,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:31,233 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 22:20:31,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:31,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781089642] [2023-04-02 22:20:31,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1781089642] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:31,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743571768] [2023-04-02 22:20:31,233 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:20:31,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:31,233 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:31,234 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:20:31,236 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-04-02 22:20:31,274 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:20:31,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:20:31,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 22:20:31,276 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:31,350 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 22:20:31,351 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:31,388 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 22:20:31,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743571768] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:31,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583309035] [2023-04-02 22:20:31,389 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:20:31,389 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:31,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:31,390 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:31,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:31,402 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:31,422 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:20:31,429 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:31,432 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:31,676 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14306#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:31,676 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:31,676 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:31,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8, 8] total 17 [2023-04-02 22:20:31,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318387625] [2023-04-02 22:20:31,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:31,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 22:20:31,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:31,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 22:20:31,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=589, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:20:31,677 INFO L87 Difference]: Start difference. First operand 180 states and 245 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 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 22:20:31,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:31,960 INFO L93 Difference]: Finished difference Result 225 states and 311 transitions. [2023-04-02 22:20:31,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 22:20:31,961 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 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 28 [2023-04-02 22:20:31,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:31,961 INFO L225 Difference]: With dead ends: 225 [2023-04-02 22:20:31,962 INFO L226 Difference]: Without dead ends: 220 [2023-04-02 22:20:31,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=113, Invalid=589, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:20:31,962 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 21 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:31,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 138 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:20:31,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2023-04-02 22:20:32,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 211. [2023-04-02 22:20:32,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.3786407766990292) internal successors, (284), 206 states have internal predecessors, (284), 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 22:20:32,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 288 transitions. [2023-04-02 22:20:32,079 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 288 transitions. Word has length 28 [2023-04-02 22:20:32,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:32,079 INFO L495 AbstractCegarLoop]: Abstraction has 211 states and 288 transitions. [2023-04-02 22:20:32,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 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 22:20:32,079 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 288 transitions. [2023-04-02 22:20:32,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-02 22:20:32,080 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:32,080 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:32,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-04-02 22:20:32,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-04-02 22:20:32,280 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:32,281 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:32,281 INFO L85 PathProgramCache]: Analyzing trace with hash -479536667, now seen corresponding path program 10 times [2023-04-02 22:20:32,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:32,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984776703] [2023-04-02 22:20:32,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:32,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:32,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:32,415 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 22:20:32,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:32,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984776703] [2023-04-02 22:20:32,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984776703] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:32,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488978071] [2023-04-02 22:20:32,416 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:20:32,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:32,416 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:32,417 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:20:32,438 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-04-02 22:20:32,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:32,457 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-02 22:20:32,458 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:32,571 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 22:20:32,572 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:32,794 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 22:20:32,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488978071] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:32,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1421434947] [2023-04-02 22:20:32,795 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:20:32,795 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:32,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:32,795 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:32,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:32,805 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:32,831 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:20:32,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:32,841 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:33,180 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15380#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:33,180 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:33,180 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:33,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 32 [2023-04-02 22:20:33,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094436588] [2023-04-02 22:20:33,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:33,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-02 22:20:33,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:33,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-02 22:20:33,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=1487, Unknown=0, NotChecked=0, Total=1722 [2023-04-02 22:20:33,181 INFO L87 Difference]: Start difference. First operand 211 states and 288 transitions. Second operand has 32 states, 32 states have (on average 1.375) internal successors, (44), 32 states have internal predecessors, (44), 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 22:20:35,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:35,882 INFO L93 Difference]: Finished difference Result 451 states and 555 transitions. [2023-04-02 22:20:35,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2023-04-02 22:20:35,882 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.375) internal successors, (44), 32 states have internal predecessors, (44), 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 29 [2023-04-02 22:20:35,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:35,883 INFO L225 Difference]: With dead ends: 451 [2023-04-02 22:20:35,883 INFO L226 Difference]: Without dead ends: 427 [2023-04-02 22:20:35,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2022 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1191, Invalid=6465, Unknown=0, NotChecked=0, Total=7656 [2023-04-02 22:20:35,885 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 178 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 790 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 790 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:35,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [178 Valid, 115 Invalid, 975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 790 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-02 22:20:35,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2023-04-02 22:20:36,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 215. [2023-04-02 22:20:36,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 210 states have (on average 1.361904761904762) internal successors, (286), 210 states have internal predecessors, (286), 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 22:20:36,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 290 transitions. [2023-04-02 22:20:36,014 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 290 transitions. Word has length 29 [2023-04-02 22:20:36,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:36,014 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 290 transitions. [2023-04-02 22:20:36,014 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.375) internal successors, (44), 32 states have internal predecessors, (44), 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 22:20:36,014 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 290 transitions. [2023-04-02 22:20:36,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-02 22:20:36,015 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:36,015 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:36,019 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2023-04-02 22:20:36,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-04-02 22:20:36,217 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:36,217 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:36,217 INFO L85 PathProgramCache]: Analyzing trace with hash -2039203279, now seen corresponding path program 9 times [2023-04-02 22:20:36,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:36,218 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448598654] [2023-04-02 22:20:36,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:36,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:36,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:36,572 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:20:36,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:36,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448598654] [2023-04-02 22:20:36,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448598654] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:36,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594227533] [2023-04-02 22:20:36,572 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:20:36,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:36,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:36,573 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:20:36,574 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-04-02 22:20:36,654 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:20:36,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:20:36,656 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 63 conjunts are in the unsatisfiable core [2023-04-02 22:20:36,656 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:37,552 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:20:37,552 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:38,283 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:20:38,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594227533] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:38,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1266043732] [2023-04-02 22:20:38,284 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:20:38,284 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:38,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:38,284 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:38,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:38,306 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:38,326 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:20:38,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:38,335 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:38,781 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17025#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:38,781 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:38,781 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:38,781 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 22, 17] total 46 [2023-04-02 22:20:38,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020939619] [2023-04-02 22:20:38,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:38,782 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-04-02 22:20:38,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:38,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-04-02 22:20:38,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=2611, Unknown=0, NotChecked=0, Total=2970 [2023-04-02 22:20:38,783 INFO L87 Difference]: Start difference. First operand 215 states and 290 transitions. Second operand has 46 states, 45 states have (on average 1.4444444444444444) internal successors, (65), 44 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:42,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:42,081 INFO L93 Difference]: Finished difference Result 318 states and 398 transitions. [2023-04-02 22:20:42,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-04-02 22:20:42,081 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.4444444444444444) internal successors, (65), 44 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2023-04-02 22:20:42,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:42,082 INFO L225 Difference]: With dead ends: 318 [2023-04-02 22:20:42,082 INFO L226 Difference]: Without dead ends: 293 [2023-04-02 22:20:42,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1544 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=781, Invalid=5071, Unknown=0, NotChecked=0, Total=5852 [2023-04-02 22:20:42,083 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 65 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:42,083 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 124 Invalid, 925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 22:20:42,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2023-04-02 22:20:42,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 217. [2023-04-02 22:20:42,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 212 states have (on average 1.3632075471698113) internal successors, (289), 212 states have internal predecessors, (289), 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 22:20:42,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 293 transitions. [2023-04-02 22:20:42,216 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 293 transitions. Word has length 29 [2023-04-02 22:20:42,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:42,216 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 293 transitions. [2023-04-02 22:20:42,216 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.4444444444444444) internal successors, (65), 44 states have internal predecessors, (65), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:20:42,216 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 293 transitions. [2023-04-02 22:20:42,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 22:20:42,217 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:42,217 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:42,222 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-04-02 22:20:42,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:42,422 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:42,422 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:42,422 INFO L85 PathProgramCache]: Analyzing trace with hash 261743485, now seen corresponding path program 10 times [2023-04-02 22:20:42,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:42,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971317380] [2023-04-02 22:20:42,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:42,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:42,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:42,560 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-04-02 22:20:42,560 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:42,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971317380] [2023-04-02 22:20:42,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971317380] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:42,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509650490] [2023-04-02 22:20:42,561 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:20:42,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:42,561 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:42,562 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:20:42,562 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-04-02 22:20:42,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:42,599 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-02 22:20:42,599 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:42,672 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-04-02 22:20:42,672 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:42,809 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 22:20:42,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509650490] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:42,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [218836199] [2023-04-02 22:20:42,810 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:20:42,810 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:42,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:42,811 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:42,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:42,819 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:42,842 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:20:42,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:42,849 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:43,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18344#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:43,126 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:43,126 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:43,126 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 10] total 25 [2023-04-02 22:20:43,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699526950] [2023-04-02 22:20:43,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:43,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 22:20:43,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:43,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 22:20:43,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=991, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 22:20:43,128 INFO L87 Difference]: Start difference. First operand 217 states and 293 transitions. Second operand has 25 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 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 22:20:44,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:44,321 INFO L93 Difference]: Finished difference Result 344 states and 437 transitions. [2023-04-02 22:20:44,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-04-02 22:20:44,322 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 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 31 [2023-04-02 22:20:44,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:44,323 INFO L225 Difference]: With dead ends: 344 [2023-04-02 22:20:44,323 INFO L226 Difference]: Without dead ends: 277 [2023-04-02 22:20:44,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=285, Invalid=2367, Unknown=0, NotChecked=0, Total=2652 [2023-04-02 22:20:44,324 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 43 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 833 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 833 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:44,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 96 Invalid, 879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 833 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 22:20:44,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2023-04-02 22:20:44,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 203. [2023-04-02 22:20:44,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 198 states have (on average 1.3383838383838385) internal successors, (265), 198 states have internal predecessors, (265), 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 22:20:44,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 269 transitions. [2023-04-02 22:20:44,453 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 269 transitions. Word has length 31 [2023-04-02 22:20:44,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:44,453 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 269 transitions. [2023-04-02 22:20:44,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 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 22:20:44,453 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 269 transitions. [2023-04-02 22:20:44,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 22:20:44,454 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:44,454 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:44,458 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-04-02 22:20:44,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:44,658 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:44,658 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:44,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1761741105, now seen corresponding path program 11 times [2023-04-02 22:20:44,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:44,658 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888412520] [2023-04-02 22:20:44,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:44,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:44,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:44,831 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 22:20:44,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:44,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888412520] [2023-04-02 22:20:44,832 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888412520] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:44,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472000362] [2023-04-02 22:20:44,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:20:44,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:44,832 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:44,833 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:20:44,837 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-04-02 22:20:44,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 22:20:44,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:20:44,893 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 22:20:44,893 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:44,980 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 22:20:44,980 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:45,028 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 22:20:45,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472000362] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:45,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [107132726] [2023-04-02 22:20:45,029 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:20:45,029 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:45,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:45,029 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:45,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:45,040 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:45,058 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-02 22:20:45,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:45,066 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:45,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19675#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:45,318 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:45,318 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:45,318 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 20 [2023-04-02 22:20:45,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990457966] [2023-04-02 22:20:45,318 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:45,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 22:20:45,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:45,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 22:20:45,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=729, Unknown=0, NotChecked=0, Total=870 [2023-04-02 22:20:45,319 INFO L87 Difference]: Start difference. First operand 203 states and 269 transitions. Second operand has 20 states, 20 states have (on average 1.9) internal successors, (38), 20 states have internal predecessors, (38), 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 22:20:45,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:20:45,655 INFO L93 Difference]: Finished difference Result 251 states and 338 transitions. [2023-04-02 22:20:45,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 22:20:45,655 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.9) internal successors, (38), 20 states have internal predecessors, (38), 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 31 [2023-04-02 22:20:45,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:20:45,656 INFO L225 Difference]: With dead ends: 251 [2023-04-02 22:20:45,656 INFO L226 Difference]: Without dead ends: 246 [2023-04-02 22:20:45,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=729, Unknown=0, NotChecked=0, Total=870 [2023-04-02 22:20:45,657 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 70 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:20:45,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 112 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:20:45,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2023-04-02 22:20:45,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 233. [2023-04-02 22:20:45,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 228 states have (on average 1.337719298245614) internal successors, (305), 228 states have internal predecessors, (305), 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 22:20:45,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 309 transitions. [2023-04-02 22:20:45,808 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 309 transitions. Word has length 31 [2023-04-02 22:20:45,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:20:45,808 INFO L495 AbstractCegarLoop]: Abstraction has 233 states and 309 transitions. [2023-04-02 22:20:45,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.9) internal successors, (38), 20 states have internal predecessors, (38), 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 22:20:45,809 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 309 transitions. [2023-04-02 22:20:45,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-02 22:20:45,809 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:20:45,809 INFO L195 NwaCegarLoop]: trace histogram [13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:20:45,815 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2023-04-02 22:20:46,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-04-02 22:20:46,012 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:20:46,012 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:20:46,012 INFO L85 PathProgramCache]: Analyzing trace with hash -489364312, now seen corresponding path program 11 times [2023-04-02 22:20:46,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:20:46,012 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088496473] [2023-04-02 22:20:46,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:20:46,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:20:46,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:20:46,228 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:20:46,228 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:20:46,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088496473] [2023-04-02 22:20:46,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088496473] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:20:46,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701434470] [2023-04-02 22:20:46,228 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:20:46,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:20:46,229 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:20:46,229 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:20:46,231 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-04-02 22:20:46,477 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-04-02 22:20:46,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:20:46,479 INFO L262 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 35 conjunts are in the unsatisfiable core [2023-04-02 22:20:46,480 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:20:46,534 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:20:46,535 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:20:46,902 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:20:46,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701434470] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:20:46,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1339490255] [2023-04-02 22:20:46,903 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-02 22:20:46,904 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:20:46,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:20:46,904 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:20:46,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:20:46,925 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:20:46,946 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-04-02 22:20:46,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:20:46,955 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:20:47,316 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20868#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:20:47,316 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:20:47,316 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:20:47,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2023-04-02 22:20:47,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638532776] [2023-04-02 22:20:47,317 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:20:47,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-04-02 22:20:47,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:20:47,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-04-02 22:20:47,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1763, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 22:20:47,319 INFO L87 Difference]: Start difference. First operand 233 states and 309 transitions. Second operand has 37 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 37 states have internal predecessors, (46), 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 22:21:17,454 WARN L223 SmtUtils]: Spent 7.45s on a formula simplification that was a NOOP. DAG size: 67 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 22:21:37,207 WARN L223 SmtUtils]: Spent 10.95s on a formula simplification that was a NOOP. DAG size: 63 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 22:22:10,158 WARN L223 SmtUtils]: Spent 5.30s on a formula simplification that was a NOOP. DAG size: 61 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)