/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-de42.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 05:04:58,599 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 05:04:58,600 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 05:04:58,622 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 05:04:58,622 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 05:04:58,623 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 05:04:58,624 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 05:04:58,630 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 05:04:58,632 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 05:04:58,636 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 05:04:58,637 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 05:04:58,638 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 05:04:58,638 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 05:04:58,641 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 05:04:58,642 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 05:04:58,644 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 05:04:58,645 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 05:04:58,645 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 05:04:58,648 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 05:04:58,652 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 05:04:58,652 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 05:04:58,654 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 05:04:58,655 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 05:04:58,656 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 05:04:58,661 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 05:04:58,661 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 05:04:58,661 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 05:04:58,662 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 05:04:58,662 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 05:04:58,663 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 05:04:58,663 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 05:04:58,663 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 05:04:58,664 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 05:04:58,664 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 05:04:58,665 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 05:04:58,665 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 05:04:58,665 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 05:04:58,665 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 05:04:58,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 05:04:58,666 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 05:04:58,666 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 05:04:58,671 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 05:04:58,698 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 05:04:58,698 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 05:04:58,698 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 05:04:58,699 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 05:04:58,699 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 05:04:58,699 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 05:04:58,699 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 05:04:58,699 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 05:04:58,699 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 05:04:58,699 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 05:04:58,700 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 05:04:58,700 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 05:04:58,700 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 05:04:58,700 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 05:04:58,700 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 05:04:58,700 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 05:04:58,700 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 05:04:58,700 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 05:04:58,700 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 05:04:58,701 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 05:04:58,702 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 05:04:58,702 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 05:04:58,702 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 05:04:58,702 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 05:04:58,900 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 05:04:58,918 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 05:04:58,922 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 05:04:58,923 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 05:04:58,924 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 05:04:58,925 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/in-de42.c [2023-04-01 05:05:00,005 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 05:05:00,161 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 05:05:00,161 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/in-de42.c [2023-04-01 05:05:00,166 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0adc028d8/04e87f77e8d54ecca5d3f75b6c119378/FLAG07bed979f [2023-04-01 05:05:00,177 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0adc028d8/04e87f77e8d54ecca5d3f75b6c119378 [2023-04-01 05:05:00,179 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 05:05:00,180 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 05:05:00,182 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 05:05:00,182 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 05:05:00,184 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 05:05:00,184 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,185 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c8b6e5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00, skipping insertion in model container [2023-04-01 05:05:00,185 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,190 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 05:05:00,199 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 05:05:00,302 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-de42.c[368,381] [2023-04-01 05:05:00,310 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 05:05:00,316 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 05:05:00,322 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-de42.c[368,381] [2023-04-01 05:05:00,325 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 05:05:00,333 INFO L208 MainTranslator]: Completed translation [2023-04-01 05:05:00,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00 WrapperNode [2023-04-01 05:05:00,333 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 05:05:00,334 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 05:05:00,334 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 05:05:00,334 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 05:05:00,340 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,340 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,343 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,344 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,346 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,349 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,350 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,350 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,351 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 05:05:00,352 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 05:05:00,352 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 05:05:00,352 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 05:05:00,352 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (1/1) ... [2023-04-01 05:05:00,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 05:05:00,364 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:00,376 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 05:05:00,381 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 05:05:00,406 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 05:05:00,406 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 05:05:00,406 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 05:05:00,407 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 05:05:00,407 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 05:05:00,407 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 05:05:00,408 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 05:05:00,408 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 05:05:00,408 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 05:05:00,457 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 05:05:00,459 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 05:05:00,554 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 05:05:00,572 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 05:05:00,572 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-01 05:05:00,574 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 05:05:00 BoogieIcfgContainer [2023-04-01 05:05:00,574 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 05:05:00,575 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 05:05:00,575 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 05:05:00,578 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 05:05:00,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 05:05:00" (1/3) ... [2023-04-01 05:05:00,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52728db6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 05:05:00, skipping insertion in model container [2023-04-01 05:05:00,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:05:00" (2/3) ... [2023-04-01 05:05:00,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52728db6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 05:05:00, skipping insertion in model container [2023-04-01 05:05:00,579 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 05:05:00" (3/3) ... [2023-04-01 05:05:00,579 INFO L112 eAbstractionObserver]: Analyzing ICFG in-de42.c [2023-04-01 05:05:00,591 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 05:05:00,591 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 05:05:00,621 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 05:05:00,626 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;@6327f797, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 05:05:00,626 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 05:05:00,629 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) [2023-04-01 05:05:00,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-01 05:05:00,634 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:00,634 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:00,635 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:00,638 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:00,638 INFO L85 PathProgramCache]: Analyzing trace with hash 1715097009, now seen corresponding path program 1 times [2023-04-01 05:05:00,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:00,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318472173] [2023-04-01 05:05:00,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:00,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:00,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:01,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:01,303 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:01,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318472173] [2023-04-01 05:05:01,304 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318472173] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:05:01,305 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:05:01,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-04-01 05:05:01,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472795110] [2023-04-01 05:05:01,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:05:01,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 05:05:01,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:01,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 05:05:01,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-04-01 05:05:01,332 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) [2023-04-01 05:05:01,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:01,505 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2023-04-01 05:05:01,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 05:05:01,507 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 [2023-04-01 05:05:01,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:01,512 INFO L225 Difference]: With dead ends: 50 [2023-04-01 05:05:01,512 INFO L226 Difference]: Without dead ends: 25 [2023-04-01 05:05:01,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2023-04-01 05:05:01,519 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 23 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:01,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 55 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:05:01,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-04-01 05:05:01,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18. [2023-04-01 05:05:01,549 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) [2023-04-01 05:05:01,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 24 transitions. [2023-04-01 05:05:01,550 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 24 transitions. Word has length 13 [2023-04-01 05:05:01,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:01,551 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 24 transitions. [2023-04-01 05:05:01,551 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) [2023-04-01 05:05:01,551 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 24 transitions. [2023-04-01 05:05:01,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 05:05:01,551 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:01,552 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:01,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 05:05:01,552 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:01,552 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:01,553 INFO L85 PathProgramCache]: Analyzing trace with hash -29163576, now seen corresponding path program 1 times [2023-04-01 05:05:01,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:01,557 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967024801] [2023-04-01 05:05:01,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:01,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:01,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:01,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:01,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:01,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967024801] [2023-04-01 05:05:01,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967024801] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:01,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185714869] [2023-04-01 05:05:01,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:01,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:01,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:01,628 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:05:01,629 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 05:05:01,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:01,674 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 05:05:01,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:01,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:01,727 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:01,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:01,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185714869] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:01,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [769607513] [2023-04-01 05:05:01,787 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:01,787 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:01,789 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:01,793 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:01,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:01,861 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:01,894 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:01,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:01,917 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:02,185 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '230#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:02,186 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:02,186 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:02,186 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-04-01 05:05:02,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960438959] [2023-04-01 05:05:02,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:02,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 05:05:02,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:02,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 05:05:02,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:05:02,188 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) [2023-04-01 05:05:02,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:02,288 INFO L93 Difference]: Finished difference Result 42 states and 65 transitions. [2023-04-01 05:05:02,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 05:05:02,288 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 [2023-04-01 05:05:02,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:02,289 INFO L225 Difference]: With dead ends: 42 [2023-04-01 05:05:02,289 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 05:05:02,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2023-04-01 05:05:02,290 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:02,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 41 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:05:02,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 05:05:02,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2023-04-01 05:05:02,295 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) [2023-04-01 05:05:02,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2023-04-01 05:05:02,296 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 14 [2023-04-01 05:05:02,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:02,296 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2023-04-01 05:05:02,297 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) [2023-04-01 05:05:02,297 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2023-04-01 05:05:02,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 05:05:02,297 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:02,297 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:02,319 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 05:05:02,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:02,503 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:02,503 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:02,503 INFO L85 PathProgramCache]: Analyzing trace with hash 665492143, now seen corresponding path program 1 times [2023-04-01 05:05:02,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:02,506 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197404676] [2023-04-01 05:05:02,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:02,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:02,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:02,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:02,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:02,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197404676] [2023-04-01 05:05:02,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [197404676] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:05:02,550 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:05:02,550 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 05:05:02,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868779236] [2023-04-01 05:05:02,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:05:02,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 05:05:02,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:02,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 05:05:02,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:05:02,551 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) [2023-04-01 05:05:02,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:02,574 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2023-04-01 05:05:02,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 05:05:02,574 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 [2023-04-01 05:05:02,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:02,576 INFO L225 Difference]: With dead ends: 38 [2023-04-01 05:05:02,576 INFO L226 Difference]: Without dead ends: 30 [2023-04-01 05:05:02,576 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 [2023-04-01 05:05:02,578 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 [2023-04-01 05:05:02,579 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] [2023-04-01 05:05:02,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-04-01 05:05:02,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-04-01 05:05:02,585 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) [2023-04-01 05:05:02,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 42 transitions. [2023-04-01 05:05:02,585 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 42 transitions. Word has length 14 [2023-04-01 05:05:02,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:02,586 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 42 transitions. [2023-04-01 05:05:02,586 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) [2023-04-01 05:05:02,586 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 42 transitions. [2023-04-01 05:05:02,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 05:05:02,586 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:02,586 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:02,586 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 05:05:02,587 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:02,587 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:02,587 INFO L85 PathProgramCache]: Analyzing trace with hash 252696611, now seen corresponding path program 1 times [2023-04-01 05:05:02,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:02,587 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838156219] [2023-04-01 05:05:02,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:02,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:02,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:02,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:02,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:02,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838156219] [2023-04-01 05:05:02,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838156219] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:05:02,642 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:05:02,642 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 05:05:02,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454669223] [2023-04-01 05:05:02,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:05:02,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 05:05:02,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:02,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 05:05:02,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-01 05:05:02,643 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) [2023-04-01 05:05:02,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:02,668 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2023-04-01 05:05:02,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 05:05:02,668 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 [2023-04-01 05:05:02,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:02,669 INFO L225 Difference]: With dead ends: 37 [2023-04-01 05:05:02,669 INFO L226 Difference]: Without dead ends: 28 [2023-04-01 05:05:02,669 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 [2023-04-01 05:05:02,670 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 [2023-04-01 05:05:02,670 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] [2023-04-01 05:05:02,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-01 05:05:02,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-04-01 05:05:02,674 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) [2023-04-01 05:05:02,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2023-04-01 05:05:02,674 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 14 [2023-04-01 05:05:02,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:02,674 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2023-04-01 05:05:02,674 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) [2023-04-01 05:05:02,674 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2023-04-01 05:05:02,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-01 05:05:02,676 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:02,676 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:02,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 05:05:02,677 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:02,677 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:02,677 INFO L85 PathProgramCache]: Analyzing trace with hash -648774591, now seen corresponding path program 1 times [2023-04-01 05:05:02,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:02,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110532195] [2023-04-01 05:05:02,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:02,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:02,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:02,721 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 05:05:02,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:02,722 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110532195] [2023-04-01 05:05:02,722 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110532195] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:02,722 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180647932] [2023-04-01 05:05:02,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:02,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:02,722 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:02,723 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:05:02,725 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 05:05:02,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:02,754 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 05:05:02,754 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:02,771 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 05:05:02,771 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:02,809 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 05:05:02,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180647932] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:02,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [241171628] [2023-04-01 05:05:02,811 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:02,811 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:02,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:02,811 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:02,812 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:02,829 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:02,883 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:02,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:02,898 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:03,109 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '728#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:03,110 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:03,110 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:03,110 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2023-04-01 05:05:03,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360336590] [2023-04-01 05:05:03,110 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:03,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 05:05:03,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:03,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 05:05:03,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2023-04-01 05:05:03,111 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) [2023-04-01 05:05:03,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:03,153 INFO L93 Difference]: Finished difference Result 42 states and 57 transitions. [2023-04-01 05:05:03,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 05:05:03,154 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 [2023-04-01 05:05:03,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:03,155 INFO L225 Difference]: With dead ends: 42 [2023-04-01 05:05:03,155 INFO L226 Difference]: Without dead ends: 37 [2023-04-01 05:05:03,155 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 [2023-04-01 05:05:03,155 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 [2023-04-01 05:05:03,156 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] [2023-04-01 05:05:03,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-04-01 05:05:03,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2023-04-01 05:05:03,163 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) [2023-04-01 05:05:03,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 50 transitions. [2023-04-01 05:05:03,165 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 50 transitions. Word has length 16 [2023-04-01 05:05:03,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:03,165 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 50 transitions. [2023-04-01 05:05:03,166 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) [2023-04-01 05:05:03,166 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 50 transitions. [2023-04-01 05:05:03,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 05:05:03,167 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:03,167 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:03,187 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:03,372 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 [2023-04-01 05:05:03,372 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:03,372 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:03,372 INFO L85 PathProgramCache]: Analyzing trace with hash 2078382961, now seen corresponding path program 2 times [2023-04-01 05:05:03,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:03,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785414287] [2023-04-01 05:05:03,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:03,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:03,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:03,444 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:03,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:03,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785414287] [2023-04-01 05:05:03,444 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1785414287] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:03,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696152561] [2023-04-01 05:05:03,444 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:05:03,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:03,445 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:03,445 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:05:03,491 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 05:05:03,496 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 05:05:03,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:03,497 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2023-04-01 05:05:03,498 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:03,521 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:03,521 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:03,601 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:03,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696152561] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:03,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1360099198] [2023-04-01 05:05:03,603 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:03,603 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:03,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:03,603 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:03,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:03,622 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:03,644 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:03,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:03,662 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:03,953 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '997#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:03,953 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:03,953 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:03,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-04-01 05:05:03,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870574690] [2023-04-01 05:05:03,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:03,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-01 05:05:03,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:03,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-01 05:05:03,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2023-04-01 05:05:03,955 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) [2023-04-01 05:05:04,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:04,603 INFO L93 Difference]: Finished difference Result 109 states and 183 transitions. [2023-04-01 05:05:04,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-01 05:05:04,605 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 [2023-04-01 05:05:04,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:04,605 INFO L225 Difference]: With dead ends: 109 [2023-04-01 05:05:04,605 INFO L226 Difference]: Without dead ends: 98 [2023-04-01 05:05:04,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=339, Invalid=1301, Unknown=0, NotChecked=0, Total=1640 [2023-04-01 05:05:04,607 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 155 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:04,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 60 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 05:05:04,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-04-01 05:05:04,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 56. [2023-04-01 05:05:04,628 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) [2023-04-01 05:05:04,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 81 transitions. [2023-04-01 05:05:04,632 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 81 transitions. Word has length 17 [2023-04-01 05:05:04,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:04,632 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 81 transitions. [2023-04-01 05:05:04,632 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) [2023-04-01 05:05:04,635 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 81 transitions. [2023-04-01 05:05:04,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 05:05:04,636 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:04,636 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:04,644 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:04,844 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 [2023-04-01 05:05:04,844 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:04,845 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:04,845 INFO L85 PathProgramCache]: Analyzing trace with hash 399916575, now seen corresponding path program 1 times [2023-04-01 05:05:04,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:04,845 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772704124] [2023-04-01 05:05:04,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:04,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:04,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:05,131 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:05,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:05,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772704124] [2023-04-01 05:05:05,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772704124] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:05,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610917648] [2023-04-01 05:05:05,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:05,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:05,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:05,133 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:05:05,159 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 05:05:05,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:05,178 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 28 conjunts are in the unsatisfiable core [2023-04-01 05:05:05,179 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:05,422 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:05,423 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:05,734 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:05,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610917648] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:05,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [539666598] [2023-04-01 05:05:05,735 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:05,736 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:05,736 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:05,736 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:05,736 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:05,757 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:05,793 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:05,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:05,808 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:06,141 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1481#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:06,141 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:06,141 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:06,141 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 23 [2023-04-01 05:05:06,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067009288] [2023-04-01 05:05:06,141 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:06,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-01 05:05:06,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:06,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-01 05:05:06,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=942, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 05:05:06,143 INFO L87 Difference]: Start difference. First operand 56 states and 81 transitions. Second operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 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) [2023-04-01 05:05:06,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:06,593 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2023-04-01 05:05:06,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 05:05:06,594 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 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 [2023-04-01 05:05:06,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:06,594 INFO L225 Difference]: With dead ends: 71 [2023-04-01 05:05:06,595 INFO L226 Difference]: Without dead ends: 53 [2023-04-01 05:05:06,595 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=150, Invalid=1182, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 05:05:06,596 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 10 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:06,596 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 73 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 05:05:06,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-04-01 05:05:06,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2023-04-01 05:05:06,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.4791666666666667) internal successors, (71), 48 states have internal predecessors, (71), 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) [2023-04-01 05:05:06,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 75 transitions. [2023-04-01 05:05:06,606 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 75 transitions. Word has length 17 [2023-04-01 05:05:06,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:06,606 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 75 transitions. [2023-04-01 05:05:06,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 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) [2023-04-01 05:05:06,611 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 75 transitions. [2023-04-01 05:05:06,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 05:05:06,613 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:06,613 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:06,634 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:06,818 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 [2023-04-01 05:05:06,818 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:06,819 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:06,819 INFO L85 PathProgramCache]: Analyzing trace with hash 443274365, now seen corresponding path program 2 times [2023-04-01 05:05:06,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:06,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554397658] [2023-04-01 05:05:06,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:06,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:06,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:06,885 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 05:05:06,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:06,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554397658] [2023-04-01 05:05:06,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1554397658] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:06,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389171640] [2023-04-01 05:05:06,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:05:06,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:06,886 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:06,887 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:05:06,907 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 05:05:06,936 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 05:05:06,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:06,937 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-01 05:05:06,938 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:06,968 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 05:05:06,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:07,011 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 05:05:07,011 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389171640] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:07,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1157693149] [2023-04-01 05:05:07,013 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:07,013 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:07,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:07,013 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:07,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:07,025 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:07,070 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:07,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:07,084 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:07,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1859#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:07,444 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:07,444 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:07,444 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 13 [2023-04-01 05:05:07,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861782555] [2023-04-01 05:05:07,445 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:07,445 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 05:05:07,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:07,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 05:05:07,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2023-04-01 05:05:07,446 INFO L87 Difference]: Start difference. First operand 53 states and 75 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) [2023-04-01 05:05:07,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:07,597 INFO L93 Difference]: Finished difference Result 79 states and 109 transitions. [2023-04-01 05:05:07,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 05:05:07,598 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 [2023-04-01 05:05:07,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:07,598 INFO L225 Difference]: With dead ends: 79 [2023-04-01 05:05:07,598 INFO L226 Difference]: Without dead ends: 63 [2023-04-01 05:05:07,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=90, Invalid=560, Unknown=0, NotChecked=0, Total=650 [2023-04-01 05:05:07,599 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:07,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 54 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:05:07,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-04-01 05:05:07,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 51. [2023-04-01 05:05:07,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 46 states have internal predecessors, (67), 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) [2023-04-01 05:05:07,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 71 transitions. [2023-04-01 05:05:07,623 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 71 transitions. Word has length 19 [2023-04-01 05:05:07,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:07,624 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 71 transitions. [2023-04-01 05:05:07,624 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) [2023-04-01 05:05:07,625 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 71 transitions. [2023-04-01 05:05:07,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 05:05:07,628 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:07,628 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:07,650 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:07,834 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 [2023-04-01 05:05:07,835 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:07,835 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:07,835 INFO L85 PathProgramCache]: Analyzing trace with hash -511235023, now seen corresponding path program 2 times [2023-04-01 05:05:07,835 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:07,835 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371356396] [2023-04-01 05:05:07,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:07,836 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:07,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:07,950 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 05:05:07,950 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:07,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371356396] [2023-04-01 05:05:07,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371356396] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:07,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439181561] [2023-04-01 05:05:07,950 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:05:07,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:07,950 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:07,952 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) [2023-04-01 05:05:07,975 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 05:05:07,997 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 05:05:07,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:07,998 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 05:05:07,999 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:08,038 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 05:05:08,038 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:08,071 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 05:05:08,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439181561] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:08,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1101842474] [2023-04-01 05:05:08,074 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:08,075 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:08,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:08,075 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:08,075 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:08,088 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:08,118 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:08,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:08,128 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:08,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2243#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:08,410 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:08,410 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:08,411 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 8 [2023-04-01 05:05:08,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435651682] [2023-04-01 05:05:08,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:08,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 05:05:08,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:08,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 05:05:08,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:05:08,412 INFO L87 Difference]: Start difference. First operand 51 states and 71 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) [2023-04-01 05:05:08,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:08,506 INFO L93 Difference]: Finished difference Result 71 states and 99 transitions. [2023-04-01 05:05:08,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 05:05:08,506 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 [2023-04-01 05:05:08,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:08,507 INFO L225 Difference]: With dead ends: 71 [2023-04-01 05:05:08,507 INFO L226 Difference]: Without dead ends: 66 [2023-04-01 05:05:08,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:05:08,508 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:08,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 56 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:05:08,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-04-01 05:05:08,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2023-04-01 05:05:08,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.4482758620689655) internal successors, (84), 58 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) [2023-04-01 05:05:08,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 88 transitions. [2023-04-01 05:05:08,524 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 88 transitions. Word has length 19 [2023-04-01 05:05:08,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:08,524 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 88 transitions. [2023-04-01 05:05:08,524 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) [2023-04-01 05:05:08,524 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 88 transitions. [2023-04-01 05:05:08,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 05:05:08,525 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:08,525 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:08,542 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-01 05:05:08,730 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 [2023-04-01 05:05:08,730 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:08,731 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:08,731 INFO L85 PathProgramCache]: Analyzing trace with hash 1235266527, now seen corresponding path program 3 times [2023-04-01 05:05:08,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:08,731 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311946523] [2023-04-01 05:05:08,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:08,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:08,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:08,832 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 05:05:08,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:08,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311946523] [2023-04-01 05:05:08,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311946523] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:08,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686164992] [2023-04-01 05:05:08,833 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 05:05:08,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:08,833 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:08,834 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) [2023-04-01 05:05:08,857 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 05:05:08,901 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 05:05:08,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:08,902 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 17 conjunts are in the unsatisfiable core [2023-04-01 05:05:08,903 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:08,938 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 05:05:08,938 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:09,051 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 05:05:09,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686164992] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:09,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [781949007] [2023-04-01 05:05:09,053 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:09,053 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:09,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:09,053 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:09,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:09,067 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:09,093 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:09,103 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:09,107 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:09,396 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2652#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:09,396 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:09,396 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:09,396 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2023-04-01 05:05:09,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092484105] [2023-04-01 05:05:09,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:09,397 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-01 05:05:09,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:09,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-01 05:05:09,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2023-04-01 05:05:09,398 INFO L87 Difference]: Start difference. First operand 63 states and 88 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) [2023-04-01 05:05:11,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:11,890 INFO L93 Difference]: Finished difference Result 159 states and 243 transitions. [2023-04-01 05:05:11,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2023-04-01 05:05:11,891 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 [2023-04-01 05:05:11,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:11,892 INFO L225 Difference]: With dead ends: 159 [2023-04-01 05:05:11,892 INFO L226 Difference]: Without dead ends: 138 [2023-04-01 05:05:11,893 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1718 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1171, Invalid=4379, Unknown=0, NotChecked=0, Total=5550 [2023-04-01 05:05:11,894 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 221 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:11,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 78 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 05:05:11,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-04-01 05:05:11,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 80. [2023-04-01 05:05:11,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.44) internal successors, (108), 75 states have internal predecessors, (108), 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) [2023-04-01 05:05:11,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 112 transitions. [2023-04-01 05:05:11,917 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 112 transitions. Word has length 21 [2023-04-01 05:05:11,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:11,917 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 112 transitions. [2023-04-01 05:05:11,917 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) [2023-04-01 05:05:11,917 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 112 transitions. [2023-04-01 05:05:11,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 05:05:11,918 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:11,919 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:11,925 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:12,125 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 [2023-04-01 05:05:12,126 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:12,126 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:12,126 INFO L85 PathProgramCache]: Analyzing trace with hash 1876110321, now seen corresponding path program 4 times [2023-04-01 05:05:12,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:12,126 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733973820] [2023-04-01 05:05:12,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:12,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:12,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:12,365 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:12,365 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:12,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733973820] [2023-04-01 05:05:12,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733973820] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:12,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449309213] [2023-04-01 05:05:12,366 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 05:05:12,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:12,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:12,367 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) [2023-04-01 05:05:12,369 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 05:05:12,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:12,414 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 43 conjunts are in the unsatisfiable core [2023-04-01 05:05:12,415 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:12,906 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:12,906 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:13,426 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:13,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449309213] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:13,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [832748750] [2023-04-01 05:05:13,428 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:13,428 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:13,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:13,429 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:13,429 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:13,442 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:13,470 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:13,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:13,481 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:13,903 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3378#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:13,904 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:13,904 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:13,904 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15, 15] total 34 [2023-04-01 05:05:13,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994855821] [2023-04-01 05:05:13,904 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:13,904 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-04-01 05:05:13,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:13,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-04-01 05:05:13,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1706, Unknown=0, NotChecked=0, Total=1892 [2023-04-01 05:05:13,906 INFO L87 Difference]: Start difference. First operand 80 states and 112 transitions. Second operand has 34 states, 33 states have (on average 1.303030303030303) internal successors, (43), 32 states have internal predecessors, (43), 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) [2023-04-01 05:05:14,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:14,641 INFO L93 Difference]: Finished difference Result 101 states and 136 transitions. [2023-04-01 05:05:14,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-01 05:05:14,642 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.303030303030303) internal successors, (43), 32 states have internal predecessors, (43), 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 [2023-04-01 05:05:14,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:14,642 INFO L225 Difference]: With dead ends: 101 [2023-04-01 05:05:14,642 INFO L226 Difference]: Without dead ends: 78 [2023-04-01 05:05:14,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=272, Invalid=2278, Unknown=0, NotChecked=0, Total=2550 [2023-04-01 05:05:14,643 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 31 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:14,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 101 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 05:05:14,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-04-01 05:05:14,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2023-04-01 05:05:14,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.4305555555555556) internal successors, (103), 72 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:05:14,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 107 transitions. [2023-04-01 05:05:14,675 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 107 transitions. Word has length 21 [2023-04-01 05:05:14,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:14,675 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 107 transitions. [2023-04-01 05:05:14,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 1.303030303030303) internal successors, (43), 32 states have internal predecessors, (43), 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) [2023-04-01 05:05:14,676 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 107 transitions. [2023-04-01 05:05:14,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-01 05:05:14,676 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:14,676 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:14,683 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:14,883 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 [2023-04-01 05:05:14,883 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:14,883 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:14,883 INFO L85 PathProgramCache]: Analyzing trace with hash 178850625, now seen corresponding path program 3 times [2023-04-01 05:05:14,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:14,883 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932944589] [2023-04-01 05:05:14,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:14,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:14,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:14,987 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 05:05:14,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:14,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932944589] [2023-04-01 05:05:14,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932944589] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:14,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277002013] [2023-04-01 05:05:14,988 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 05:05:14,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:14,988 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:15,002 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) [2023-04-01 05:05:15,032 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 05:05:15,044 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 05:05:15,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:15,044 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-01 05:05:15,046 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:15,090 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 05:05:15,090 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:15,116 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 05:05:15,116 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277002013] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:15,116 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [811097965] [2023-04-01 05:05:15,118 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:15,118 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:15,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:15,118 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:15,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:15,134 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:15,161 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:15,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:15,178 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:15,402 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3886#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:15,402 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:15,402 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:15,402 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 11 [2023-04-01 05:05:15,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789661806] [2023-04-01 05:05:15,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:15,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 05:05:15,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:15,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 05:05:15,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2023-04-01 05:05:15,403 INFO L87 Difference]: Start difference. First operand 77 states and 107 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) [2023-04-01 05:05:15,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:15,514 INFO L93 Difference]: Finished difference Result 103 states and 145 transitions. [2023-04-01 05:05:15,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 05:05:15,514 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 [2023-04-01 05:05:15,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:15,515 INFO L225 Difference]: With dead ends: 103 [2023-04-01 05:05:15,515 INFO L226 Difference]: Without dead ends: 98 [2023-04-01 05:05:15,515 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 [2023-04-01 05:05:15,516 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 28 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:15,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 70 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:05:15,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-04-01 05:05:15,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 92. [2023-04-01 05:05:15,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.4367816091954022) internal successors, (125), 87 states have internal predecessors, (125), 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) [2023-04-01 05:05:15,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 129 transitions. [2023-04-01 05:05:15,562 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 129 transitions. Word has length 22 [2023-04-01 05:05:15,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:15,563 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 129 transitions. [2023-04-01 05:05:15,563 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) [2023-04-01 05:05:15,563 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 129 transitions. [2023-04-01 05:05:15,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-01 05:05:15,563 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:15,563 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:15,571 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:15,767 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 [2023-04-01 05:05:15,768 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:15,768 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:15,768 INFO L85 PathProgramCache]: Analyzing trace with hash -1467995547, now seen corresponding path program 5 times [2023-04-01 05:05:15,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:15,768 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652345121] [2023-04-01 05:05:15,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:15,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:15,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:15,871 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 05:05:15,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:15,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652345121] [2023-04-01 05:05:15,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652345121] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:15,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034241391] [2023-04-01 05:05:15,871 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:05:15,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:15,872 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:15,872 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) [2023-04-01 05:05:15,874 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-01 05:05:15,931 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 05:05:15,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:15,932 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-01 05:05:15,932 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:15,994 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 05:05:15,994 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:16,076 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 05:05:16,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034241391] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:16,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305216833] [2023-04-01 05:05:16,077 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:16,077 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:16,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:16,077 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:16,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:16,087 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:16,109 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:16,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:16,116 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:16,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4428#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:16,388 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:16,388 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:16,388 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 18 [2023-04-01 05:05:16,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153854156] [2023-04-01 05:05:16,388 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:16,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-01 05:05:16,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:16,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-01 05:05:16,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=657, Unknown=0, NotChecked=0, Total=756 [2023-04-01 05:05:16,389 INFO L87 Difference]: Start difference. First operand 92 states and 129 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) [2023-04-01 05:05:16,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:16,663 INFO L93 Difference]: Finished difference Result 133 states and 181 transitions. [2023-04-01 05:05:16,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-01 05:05:16,663 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 [2023-04-01 05:05:16,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:16,664 INFO L225 Difference]: With dead ends: 133 [2023-04-01 05:05:16,664 INFO L226 Difference]: Without dead ends: 116 [2023-04-01 05:05:16,664 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=140, Invalid=982, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 05:05:16,665 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 21 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:16,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 81 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:05:16,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-04-01 05:05:16,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 89. [2023-04-01 05:05:16,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.4166666666666667) internal successors, (119), 84 states have internal predecessors, (119), 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) [2023-04-01 05:05:16,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 123 transitions. [2023-04-01 05:05:16,684 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 123 transitions. Word has length 23 [2023-04-01 05:05:16,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:16,685 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 123 transitions. [2023-04-01 05:05:16,685 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) [2023-04-01 05:05:16,685 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 123 transitions. [2023-04-01 05:05:16,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 05:05:16,685 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:16,685 INFO L195 NwaCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:16,690 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:16,889 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 [2023-04-01 05:05:16,890 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:16,890 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:16,890 INFO L85 PathProgramCache]: Analyzing trace with hash 740273512, now seen corresponding path program 3 times [2023-04-01 05:05:16,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:16,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697603295] [2023-04-01 05:05:16,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:16,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:16,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:17,047 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:17,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:17,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697603295] [2023-04-01 05:05:17,047 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697603295] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:17,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678325227] [2023-04-01 05:05:17,047 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 05:05:17,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:17,047 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:17,048 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) [2023-04-01 05:05:17,061 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 05:05:17,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 05:05:17,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:17,120 INFO L262 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 27 conjunts are in the unsatisfiable core [2023-04-01 05:05:17,121 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:17,173 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:17,173 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:17,422 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:17,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678325227] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:17,422 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1630292561] [2023-04-01 05:05:17,423 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:17,423 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:17,423 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:17,423 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:17,423 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:17,432 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:17,447 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:17,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:17,458 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:17,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5053#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:17,867 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:17,867 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:17,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2023-04-01 05:05:17,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485807044] [2023-04-01 05:05:17,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:17,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-01 05:05:17,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:17,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-01 05:05:17,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=1163, Unknown=0, NotChecked=0, Total=1406 [2023-04-01 05:05:17,869 INFO L87 Difference]: Start difference. First operand 89 states and 123 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) [2023-04-01 05:05:43,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:43,129 INFO L93 Difference]: Finished difference Result 365 states and 564 transitions. [2023-04-01 05:05:43,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2023-04-01 05:05:43,129 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 [2023-04-01 05:05:43,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:43,131 INFO L225 Difference]: With dead ends: 365 [2023-04-01 05:05:43,131 INFO L226 Difference]: Without dead ends: 332 [2023-04-01 05:05:43,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1654 ImplicationChecksByTransitivity, 24.6s TimeCoverageRelationStatistics Valid=1627, Invalid=4853, Unknown=0, NotChecked=0, Total=6480 [2023-04-01 05:05:43,132 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 656 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 773 mSolverCounterSat, 289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 656 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 1062 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 289 IncrementalHoareTripleChecker+Valid, 773 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:43,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [656 Valid, 108 Invalid, 1062 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [289 Valid, 773 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-04-01 05:05:43,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2023-04-01 05:05:43,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 133. [2023-04-01 05:05:43,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.4140625) internal successors, (181), 128 states have internal predecessors, (181), 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) [2023-04-01 05:05:43,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 185 transitions. [2023-04-01 05:05:43,179 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 185 transitions. Word has length 24 [2023-04-01 05:05:43,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:43,179 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 185 transitions. [2023-04-01 05:05:43,179 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) [2023-04-01 05:05:43,179 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 185 transitions. [2023-04-01 05:05:43,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 05:05:43,179 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:43,179 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:43,190 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:43,384 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 [2023-04-01 05:05:43,384 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:43,384 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:43,384 INFO L85 PathProgramCache]: Analyzing trace with hash -1868535119, now seen corresponding path program 4 times [2023-04-01 05:05:43,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:43,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200835015] [2023-04-01 05:05:43,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:43,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:43,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:43,514 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 05:05:43,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:43,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200835015] [2023-04-01 05:05:43,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200835015] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:43,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341892926] [2023-04-01 05:05:43,514 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 05:05:43,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:43,515 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:43,516 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) [2023-04-01 05:05:43,518 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-01 05:05:43,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:43,562 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-01 05:05:43,564 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:43,636 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 05:05:43,636 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:43,675 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 05:05:43,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341892926] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:43,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [975459866] [2023-04-01 05:05:43,677 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:43,677 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:43,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:43,677 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:43,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:43,688 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:43,709 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:43,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:43,717 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:43,970 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6294#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:43,971 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:43,971 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:43,971 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 14 [2023-04-01 05:05:43,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936675520] [2023-04-01 05:05:43,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:43,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 05:05:43,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:43,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 05:05:43,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=463, Unknown=0, NotChecked=0, Total=552 [2023-04-01 05:05:43,973 INFO L87 Difference]: Start difference. First operand 133 states and 185 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) [2023-04-01 05:05:44,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:44,136 INFO L93 Difference]: Finished difference Result 171 states and 241 transitions. [2023-04-01 05:05:44,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 05:05:44,136 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 [2023-04-01 05:05:44,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:44,137 INFO L225 Difference]: With dead ends: 171 [2023-04-01 05:05:44,137 INFO L226 Difference]: Without dead ends: 166 [2023-04-01 05:05:44,139 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 [2023-04-01 05:05:44,139 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:44,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 91 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:05:44,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2023-04-01 05:05:44,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 158. [2023-04-01 05:05:44,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 153 states have (on average 1.4183006535947713) internal successors, (217), 153 states have internal predecessors, (217), 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) [2023-04-01 05:05:44,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 221 transitions. [2023-04-01 05:05:44,193 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 221 transitions. Word has length 25 [2023-04-01 05:05:44,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:44,195 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 221 transitions. [2023-04-01 05:05:44,195 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) [2023-04-01 05:05:44,195 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 221 transitions. [2023-04-01 05:05:44,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 05:05:44,195 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:44,195 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:44,204 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:44,400 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 [2023-04-01 05:05:44,400 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:44,400 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:44,400 INFO L85 PathProgramCache]: Analyzing trace with hash -304968865, now seen corresponding path program 6 times [2023-04-01 05:05:44,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:44,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691601460] [2023-04-01 05:05:44,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:44,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:44,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:44,681 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:44,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:44,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691601460] [2023-04-01 05:05:44,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691601460] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:44,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854494716] [2023-04-01 05:05:44,682 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 05:05:44,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:44,682 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:44,683 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) [2023-04-01 05:05:44,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-01 05:05:44,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 05:05:44,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:44,780 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 57 conjunts are in the unsatisfiable core [2023-04-01 05:05:44,781 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:45,231 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:45,231 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:46,082 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:05:46,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [854494716] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:46,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [82393953] [2023-04-01 05:05:46,083 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:46,083 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:46,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:46,084 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:46,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:46,095 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:46,119 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:46,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:46,127 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:46,634 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7144#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:46,634 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:46,634 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:46,634 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19, 19] total 46 [2023-04-01 05:05:46,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441255591] [2023-04-01 05:05:46,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:46,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-04-01 05:05:46,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:46,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-04-01 05:05:46,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=2796, Unknown=0, NotChecked=0, Total=3080 [2023-04-01 05:05:46,636 INFO L87 Difference]: Start difference. First operand 158 states and 221 transitions. Second operand has 46 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 44 states have internal predecessors, (56), 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) [2023-04-01 05:05:48,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:48,205 INFO L93 Difference]: Finished difference Result 184 states and 250 transitions. [2023-04-01 05:05:48,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-01 05:05:48,205 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 44 states have internal predecessors, (56), 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 25 [2023-04-01 05:05:48,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:48,206 INFO L225 Difference]: With dead ends: 184 [2023-04-01 05:05:48,206 INFO L226 Difference]: Without dead ends: 156 [2023-04-01 05:05:48,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1168 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=484, Invalid=4072, Unknown=0, NotChecked=0, Total=4556 [2023-04-01 05:05:48,207 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 45 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 737 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 737 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:48,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 152 Invalid, 790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 737 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-01 05:05:48,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-04-01 05:05:48,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 154. [2023-04-01 05:05:48,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.4161073825503356) internal successors, (211), 149 states have internal predecessors, (211), 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) [2023-04-01 05:05:48,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 215 transitions. [2023-04-01 05:05:48,257 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 215 transitions. Word has length 25 [2023-04-01 05:05:48,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:48,257 INFO L495 AbstractCegarLoop]: Abstraction has 154 states and 215 transitions. [2023-04-01 05:05:48,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 44 states have internal predecessors, (56), 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) [2023-04-01 05:05:48,257 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 215 transitions. [2023-04-01 05:05:48,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-01 05:05:48,258 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:48,258 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:48,263 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-01 05:05:48,463 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 [2023-04-01 05:05:48,463 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:48,463 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:48,463 INFO L85 PathProgramCache]: Analyzing trace with hash -608436317, now seen corresponding path program 5 times [2023-04-01 05:05:48,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:48,464 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964436767] [2023-04-01 05:05:48,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:48,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:48,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:48,588 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 05:05:48,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:48,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964436767] [2023-04-01 05:05:48,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1964436767] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:48,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955594766] [2023-04-01 05:05:48,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:05:48,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:48,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:48,590 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) [2023-04-01 05:05:48,593 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-01 05:05:48,665 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 05:05:48,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:05:48,666 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-01 05:05:48,667 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:48,761 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 05:05:48,761 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:48,934 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 05:05:48,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955594766] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:48,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1400387218] [2023-04-01 05:05:48,935 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:48,935 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:48,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:48,936 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:48,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:48,958 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:48,978 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:48,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:48,985 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:49,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8022#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:49,319 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:49,319 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:49,319 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 27 [2023-04-01 05:05:49,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514394439] [2023-04-01 05:05:49,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:49,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-01 05:05:49,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:49,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-01 05:05:49,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1146, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 05:05:49,321 INFO L87 Difference]: Start difference. First operand 154 states and 215 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) [2023-04-01 05:05:50,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:05:50,096 INFO L93 Difference]: Finished difference Result 282 states and 360 transitions. [2023-04-01 05:05:50,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-04-01 05:05:50,096 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 [2023-04-01 05:05:50,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:05:50,101 INFO L225 Difference]: With dead ends: 282 [2023-04-01 05:05:50,101 INFO L226 Difference]: Without dead ends: 261 [2023-04-01 05:05:50,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=409, Invalid=2141, Unknown=0, NotChecked=0, Total=2550 [2023-04-01 05:05:50,106 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 80 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 05:05:50,106 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 106 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 05:05:50,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2023-04-01 05:05:50,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 168. [2023-04-01 05:05:50,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 163 states have (on average 1.4355828220858895) internal successors, (234), 163 states have internal predecessors, (234), 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) [2023-04-01 05:05:50,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 238 transitions. [2023-04-01 05:05:50,183 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 238 transitions. Word has length 26 [2023-04-01 05:05:50,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:05:50,183 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 238 transitions. [2023-04-01 05:05:50,184 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) [2023-04-01 05:05:50,184 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 238 transitions. [2023-04-01 05:05:50,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 05:05:50,184 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:05:50,184 INFO L195 NwaCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:05:50,189 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-04-01 05:05:50,389 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 [2023-04-01 05:05:50,389 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:05:50,390 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:05:50,390 INFO L85 PathProgramCache]: Analyzing trace with hash -1475941802, now seen corresponding path program 7 times [2023-04-01 05:05:50,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:05:50,390 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804067984] [2023-04-01 05:05:50,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:05:50,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:05:50,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:50,622 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 79 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 05:05:50,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:05:50,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804067984] [2023-04-01 05:05:50,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804067984] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:05:50,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859753060] [2023-04-01 05:05:50,623 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 05:05:50,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:05:50,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:05:50,624 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) [2023-04-01 05:05:50,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-01 05:05:50,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:05:50,662 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 31 conjunts are in the unsatisfiable core [2023-04-01 05:05:50,663 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:05:50,719 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 79 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 05:05:50,720 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:05:51,048 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 79 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 05:05:51,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859753060] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:05:51,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [903868340] [2023-04-01 05:05:51,049 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-04-01 05:05:51,049 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:05:51,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:05:51,049 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:05:51,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:05:51,062 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:05:51,113 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-04-01 05:05:51,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:05:51,121 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:05:51,569 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9151#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:05:51,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:05:51,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:05:51,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2023-04-01 05:05:51,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192504825] [2023-04-01 05:05:51,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:05:51,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-04-01 05:05:51,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:05:51,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-04-01 05:05:51,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=1512, Unknown=0, NotChecked=0, Total=1806 [2023-04-01 05:05:51,571 INFO L87 Difference]: Start difference. First operand 168 states and 238 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) [2023-04-01 05:06:08,553 WARN L223 SmtUtils]: Spent 6.06s on a formula simplification that was a NOOP. DAG size: 60 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)