/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 IntervalDomain -i ../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 23:06:06,523 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 23:06:06,525 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 23:06:06,570 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 23:06:06,570 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 23:06:06,573 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 23:06:06,576 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 23:06:06,578 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 23:06:06,579 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 23:06:06,583 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 23:06:06,585 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 23:06:06,586 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 23:06:06,586 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 23:06:06,588 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 23:06:06,589 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 23:06:06,590 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 23:06:06,591 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 23:06:06,591 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 23:06:06,593 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 23:06:06,598 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 23:06:06,599 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 23:06:06,599 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 23:06:06,600 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 23:06:06,601 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 23:06:06,603 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 23:06:06,603 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 23:06:06,604 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 23:06:06,604 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 23:06:06,604 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 23:06:06,605 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 23:06:06,605 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 23:06:06,606 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 23:06:06,606 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 23:06:06,607 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 23:06:06,607 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 23:06:06,608 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 23:06:06,608 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 23:06:06,608 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 23:06:06,608 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 23:06:06,609 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 23:06:06,609 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 23:06:06,610 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 [2023-03-31 23:06:06,626 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 23:06:06,626 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 23:06:06,627 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 23:06:06,627 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 23:06:06,627 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 23:06:06,627 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 23:06:06,627 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 23:06:06,628 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 23:06:06,628 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 23:06:06,628 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 23:06:06,628 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 23:06:06,628 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 23:06:06,628 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 23:06:06,628 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 23:06:06,628 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 23:06:06,629 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 23:06:06,629 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 23:06:06,629 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 23:06:06,629 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 23:06:06,629 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 23:06:06,629 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 23:06:06,630 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 23:06:06,631 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 23:06:06,631 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 23:06:06,631 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:06:06,631 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 23:06:06,631 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 23:06:06,631 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 23:06:06,631 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 23:06:06,631 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 23:06:06,632 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 23:06:06,632 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 23:06:06,632 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 23:06:06,632 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 23:06:06,860 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 23:06:06,887 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 23:06:06,890 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 23:06:06,891 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 23:06:06,892 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 23:06:06,893 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-03-31 23:06:07,942 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 23:06:08,163 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 23:06:08,163 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-03-31 23:06:08,168 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c2a59692/60dac2aec62d47d7b8fb9bae82a2a4a9/FLAG70bc35a12 [2023-03-31 23:06:08,179 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c2a59692/60dac2aec62d47d7b8fb9bae82a2a4a9 [2023-03-31 23:06:08,181 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 23:06:08,182 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 23:06:08,183 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 23:06:08,183 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 23:06:08,186 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 23:06:08,187 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,187 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15e3c0b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08, skipping insertion in model container [2023-03-31 23:06:08,188 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,194 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 23:06:08,204 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 23:06:08,338 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/nested3-1_abstracted.c[739,752] [2023-03-31 23:06:08,355 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:06:08,365 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 23:06:08,376 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/nested3-1_abstracted.c[739,752] [2023-03-31 23:06:08,392 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:06:08,404 INFO L208 MainTranslator]: Completed translation [2023-03-31 23:06:08,405 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08 WrapperNode [2023-03-31 23:06:08,405 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 23:06:08,406 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 23:06:08,406 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 23:06:08,406 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 23:06:08,416 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,416 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,422 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,422 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,432 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,437 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,444 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,445 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,447 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 23:06:08,447 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 23:06:08,448 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 23:06:08,448 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 23:06:08,448 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (1/1) ... [2023-03-31 23:06:08,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:06:08,463 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:08,482 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) [2023-03-31 23:06:08,505 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 [2023-03-31 23:06:08,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 23:06:08,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 23:06:08,526 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 23:06:08,530 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 23:06:08,530 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 23:06:08,530 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 23:06:08,530 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_double [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_float [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ulong [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ulonglong [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 23:06:08,531 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 23:06:08,532 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 23:06:08,532 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 23:06:08,532 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 23:06:08,532 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 23:06:08,532 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 23:06:08,532 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 23:06:08,532 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 23:06:08,532 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 23:06:08,533 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 23:06:08,595 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 23:06:08,597 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 23:06:08,719 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 23:06:08,773 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 23:06:08,773 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-03-31 23:06:08,775 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:06:08 BoogieIcfgContainer [2023-03-31 23:06:08,775 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 23:06:08,777 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 23:06:08,777 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 23:06:08,780 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 23:06:08,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 11:06:08" (1/3) ... [2023-03-31 23:06:08,780 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b218438 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:06:08, skipping insertion in model container [2023-03-31 23:06:08,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:06:08" (2/3) ... [2023-03-31 23:06:08,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b218438 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:06:08, skipping insertion in model container [2023-03-31 23:06:08,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:06:08" (3/3) ... [2023-03-31 23:06:08,782 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1_abstracted.c [2023-03-31 23:06:08,796 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 23:06:08,797 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 23:06:08,850 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 23:06:08,855 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;@1ac58f3c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 23:06:08,855 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 23:06:08,859 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 23:06:08,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-03-31 23:06:08,865 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:08,865 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:08,866 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:08,870 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:08,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1824935055, now seen corresponding path program 1 times [2023-03-31 23:06:08,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:08,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93138668] [2023-03-31 23:06:08,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:08,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:08,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:09,123 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:09,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:09,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93138668] [2023-03-31 23:06:09,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [93138668] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:06:09,126 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:06:09,126 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 23:06:09,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318086902] [2023-03-31 23:06:09,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:06:09,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 23:06:09,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:09,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 23:06:09,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 23:06:09,166 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2023-03-31 23:06:09,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:09,242 INFO L93 Difference]: Finished difference Result 45 states and 62 transitions. [2023-03-31 23:06:09,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 23:06:09,245 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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 10 [2023-03-31 23:06:09,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:09,252 INFO L225 Difference]: With dead ends: 45 [2023-03-31 23:06:09,252 INFO L226 Difference]: Without dead ends: 24 [2023-03-31 23:06:09,255 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 23:06:09,258 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:09,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 34 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:06:09,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-03-31 23:06:09,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 19. [2023-03-31 23:06:09,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:06:09,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2023-03-31 23:06:09,284 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 10 [2023-03-31 23:06:09,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:09,285 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2023-03-31 23:06:09,285 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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) [2023-03-31 23:06:09,285 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2023-03-31 23:06:09,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-03-31 23:06:09,286 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:09,286 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:09,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 23:06:09,286 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:09,287 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:09,287 INFO L85 PathProgramCache]: Analyzing trace with hash 1369059014, now seen corresponding path program 1 times [2023-03-31 23:06:09,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:09,288 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539323254] [2023-03-31 23:06:09,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:09,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:09,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:09,496 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:09,497 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:09,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539323254] [2023-03-31 23:06:09,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539323254] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:06:09,497 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:06:09,497 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 23:06:09,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050361232] [2023-03-31 23:06:09,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:06:09,499 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 23:06:09,499 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:09,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 23:06:09,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 23:06:09,500 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:06:09,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:09,594 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2023-03-31 23:06:09,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-03-31 23:06:09,594 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-03-31 23:06:09,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:09,595 INFO L225 Difference]: With dead ends: 30 [2023-03-31 23:06:09,595 INFO L226 Difference]: Without dead ends: 28 [2023-03-31 23:06:09,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-03-31 23:06:09,597 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 10 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:09,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 64 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:06:09,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-03-31 23:06:09,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 23. [2023-03-31 23:06:09,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:06:09,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-03-31 23:06:09,604 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 11 [2023-03-31 23:06:09,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:09,604 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-03-31 23:06:09,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:06:09,604 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-03-31 23:06:09,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-03-31 23:06:09,605 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:09,605 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:09,605 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 23:06:09,605 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:09,606 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:09,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1360806907, now seen corresponding path program 1 times [2023-03-31 23:06:09,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:09,606 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406520606] [2023-03-31 23:06:09,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:09,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:09,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:09,666 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:09,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:09,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406520606] [2023-03-31 23:06:09,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406520606] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:06:09,667 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:06:09,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 23:06:09,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865409239] [2023-03-31 23:06:09,667 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:06:09,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 23:06:09,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:09,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 23:06:09,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 23:06:09,669 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:06:09,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:09,685 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2023-03-31 23:06:09,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 23:06:09,686 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-03-31 23:06:09,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:09,687 INFO L225 Difference]: With dead ends: 43 [2023-03-31 23:06:09,687 INFO L226 Difference]: Without dead ends: 26 [2023-03-31 23:06:09,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 23:06:09,689 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:09,689 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 29 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:06:09,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-03-31 23:06:09,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-03-31 23:06:09,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:06:09,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2023-03-31 23:06:09,695 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 11 [2023-03-31 23:06:09,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:09,695 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2023-03-31 23:06:09,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 23:06:09,696 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2023-03-31 23:06:09,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-03-31 23:06:09,696 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:09,696 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:09,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-03-31 23:06:09,697 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:09,697 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:09,697 INFO L85 PathProgramCache]: Analyzing trace with hash 452630595, now seen corresponding path program 1 times [2023-03-31 23:06:09,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:09,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188293893] [2023-03-31 23:06:09,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:09,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:09,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:09,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:09,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:09,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188293893] [2023-03-31 23:06:09,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1188293893] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:09,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426253294] [2023-03-31 23:06:09,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:09,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:09,800 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:09,807 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) [2023-03-31 23:06:09,809 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 23:06:09,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:09,871 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 5 conjunts are in the unsatisfiable core [2023-03-31 23:06:09,875 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:09,919 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:09,920 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:09,981 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 23:06:09,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426253294] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:09,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980580261] [2023-03-31 23:06:10,003 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 23:06:10,003 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:10,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:10,011 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:10,011 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:10,092 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:06:10,311 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-03-31 23:06:10,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:06:10,340 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:10,603 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '427#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:10,603 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:10,603 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:10,603 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-03-31 23:06:10,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615260467] [2023-03-31 23:06:10,606 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:10,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-03-31 23:06:10,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:10,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-03-31 23:06:10,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-03-31 23:06:10,614 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:06:10,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:10,699 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2023-03-31 23:06:10,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 23:06:10,700 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 18 [2023-03-31 23:06:10,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:10,702 INFO L225 Difference]: With dead ends: 51 [2023-03-31 23:06:10,702 INFO L226 Difference]: Without dead ends: 33 [2023-03-31 23:06:10,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2023-03-31 23:06:10,705 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 4 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:10,706 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 57 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:06:10,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-03-31 23:06:10,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-03-31 23:06:10,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:06:10,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2023-03-31 23:06:10,724 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 18 [2023-03-31 23:06:10,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:10,725 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2023-03-31 23:06:10,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 23:06:10,725 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2023-03-31 23:06:10,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-03-31 23:06:10,726 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:10,726 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:10,737 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:10,934 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:10,935 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:10,935 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:10,935 INFO L85 PathProgramCache]: Analyzing trace with hash 186008059, now seen corresponding path program 2 times [2023-03-31 23:06:10,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:10,936 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874879487] [2023-03-31 23:06:10,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:10,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:10,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:11,122 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 8 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:06:11,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:11,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874879487] [2023-03-31 23:06:11,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874879487] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:11,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123734296] [2023-03-31 23:06:11,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:06:11,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:11,126 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:11,127 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) [2023-03-31 23:06:11,129 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 23:06:11,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 23:06:11,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:06:11,195 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 23:06:11,198 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:11,367 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-03-31 23:06:11,368 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 23:06:11,368 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123734296] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:06:11,369 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 23:06:11,369 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2023-03-31 23:06:11,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66819194] [2023-03-31 23:06:11,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:06:11,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-03-31 23:06:11,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:11,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-03-31 23:06:11,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-03-31 23:06:11,371 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 23:06:11,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:11,505 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2023-03-31 23:06:11,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 23:06:11,506 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2023-03-31 23:06:11,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:11,506 INFO L225 Difference]: With dead ends: 39 [2023-03-31 23:06:11,507 INFO L226 Difference]: Without dead ends: 35 [2023-03-31 23:06:11,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2023-03-31 23:06:11,507 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 10 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:11,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 71 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:06:11,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-03-31 23:06:11,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-03-31 23:06:11,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 8 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 23:06:11,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2023-03-31 23:06:11,518 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2023-03-31 23:06:11,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:11,519 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2023-03-31 23:06:11,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 23:06:11,519 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2023-03-31 23:06:11,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-03-31 23:06:11,521 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:11,521 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:11,529 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:11,726 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 [2023-03-31 23:06:11,727 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:11,727 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:11,727 INFO L85 PathProgramCache]: Analyzing trace with hash -1470815926, now seen corresponding path program 1 times [2023-03-31 23:06:11,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:11,728 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610301484] [2023-03-31 23:06:11,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:11,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:11,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:11,895 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-03-31 23:06:11,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:11,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610301484] [2023-03-31 23:06:11,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610301484] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:11,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603446630] [2023-03-31 23:06:11,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:11,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:11,896 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:11,897 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) [2023-03-31 23:06:11,899 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 23:06:11,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:11,953 INFO L262 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 23:06:11,956 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:12,038 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-03-31 23:06:12,038 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:12,143 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-03-31 23:06:12,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603446630] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:12,144 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1166222669] [2023-03-31 23:06:12,146 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 23:06:12,146 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:12,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:12,146 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:12,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:12,163 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:06:12,415 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-03-31 23:06:12,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:06:12,423 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:12,712 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1101#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:12,712 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:12,712 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:12,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 15 [2023-03-31 23:06:12,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721733765] [2023-03-31 23:06:12,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:12,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-03-31 23:06:12,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:12,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-03-31 23:06:12,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2023-03-31 23:06:12,715 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-03-31 23:06:13,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:13,232 INFO L93 Difference]: Finished difference Result 132 states and 173 transitions. [2023-03-31 23:06:13,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-03-31 23:06:13,232 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2023-03-31 23:06:13,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:13,234 INFO L225 Difference]: With dead ends: 132 [2023-03-31 23:06:13,234 INFO L226 Difference]: Without dead ends: 103 [2023-03-31 23:06:13,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=332, Invalid=1738, Unknown=0, NotChecked=0, Total=2070 [2023-03-31 23:06:13,236 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 62 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:13,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 120 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:06:13,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-03-31 23:06:13,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 95. [2023-03-31 23:06:13,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 64 states have (on average 1.078125) internal successors, (69), 64 states have internal predecessors, (69), 27 states have call successors, (27), 5 states have call predecessors, (27), 3 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2023-03-31 23:06:13,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2023-03-31 23:06:13,260 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 46 [2023-03-31 23:06:13,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:13,261 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2023-03-31 23:06:13,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 10 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-03-31 23:06:13,261 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2023-03-31 23:06:13,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-03-31 23:06:13,273 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:13,273 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 20, 20, 20, 20, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:13,284 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:13,479 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 [2023-03-31 23:06:13,480 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:13,480 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:13,481 INFO L85 PathProgramCache]: Analyzing trace with hash -1659286991, now seen corresponding path program 2 times [2023-03-31 23:06:13,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:13,481 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916606077] [2023-03-31 23:06:13,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:13,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:13,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:13,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 310 proven. 35 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2023-03-31 23:06:13,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:13,846 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916606077] [2023-03-31 23:06:13,846 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916606077] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:13,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761048349] [2023-03-31 23:06:13,847 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:06:13,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:13,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:13,848 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) [2023-03-31 23:06:13,872 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 23:06:14,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-03-31 23:06:14,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:06:14,506 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 16 conjunts are in the unsatisfiable core [2023-03-31 23:06:14,510 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:14,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 406 proven. 35 refuted. 0 times theorem prover too weak. 1389 trivial. 0 not checked. [2023-03-31 23:06:14,585 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:14,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 316 proven. 35 refuted. 0 times theorem prover too weak. 1479 trivial. 0 not checked. [2023-03-31 23:06:14,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1761048349] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:14,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1628610370] [2023-03-31 23:06:14,882 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 23:06:14,882 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:14,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:14,882 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:14,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:14,899 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:06:15,246 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-03-31 23:06:15,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:06:15,252 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:15,932 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2625#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:15,932 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:15,932 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:15,932 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 16 [2023-03-31 23:06:15,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845520981] [2023-03-31 23:06:15,933 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:15,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-03-31 23:06:15,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:15,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-03-31 23:06:15,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2023-03-31 23:06:15,935 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) [2023-03-31 23:06:16,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:16,778 INFO L93 Difference]: Finished difference Result 252 states and 354 transitions. [2023-03-31 23:06:16,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-03-31 23:06:16,778 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) Word has length 182 [2023-03-31 23:06:16,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:16,780 INFO L225 Difference]: With dead ends: 252 [2023-03-31 23:06:16,780 INFO L226 Difference]: Without dead ends: 179 [2023-03-31 23:06:16,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 510 SyntacticMatches, 21 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=214, Invalid=778, Unknown=0, NotChecked=0, Total=992 [2023-03-31 23:06:16,782 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 16 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:16,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 134 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:06:16,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-03-31 23:06:16,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2023-03-31 23:06:16,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 120 states have (on average 1.0416666666666667) internal successors, (125), 120 states have internal predecessors, (125), 55 states have call successors, (55), 5 states have call predecessors, (55), 3 states have return successors, (53), 53 states have call predecessors, (53), 53 states have call successors, (53) [2023-03-31 23:06:16,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 233 transitions. [2023-03-31 23:06:16,822 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 233 transitions. Word has length 182 [2023-03-31 23:06:16,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:16,823 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 233 transitions. [2023-03-31 23:06:16,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.9375) internal successors, (47), 16 states have internal predecessors, (47), 12 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 12 states have call predecessors, (16), 12 states have call successors, (16) [2023-03-31 23:06:16,823 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 233 transitions. [2023-03-31 23:06:16,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2023-03-31 23:06:16,828 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:16,828 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 48, 48, 48, 48, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:16,839 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:17,035 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 [2023-03-31 23:06:17,035 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:17,035 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:17,035 INFO L85 PathProgramCache]: Analyzing trace with hash 471985621, now seen corresponding path program 3 times [2023-03-31 23:06:17,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:17,036 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288044375] [2023-03-31 23:06:17,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:17,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:17,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:18,138 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 1479 proven. 210 refuted. 0 times theorem prover too weak. 7323 trivial. 0 not checked. [2023-03-31 23:06:18,138 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:18,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288044375] [2023-03-31 23:06:18,139 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288044375] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:18,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215797136] [2023-03-31 23:06:18,139 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:06:18,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:18,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:18,140 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) [2023-03-31 23:06:18,142 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 23:06:18,325 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:06:18,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:06:18,329 INFO L262 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 22 conjunts are in the unsatisfiable core [2023-03-31 23:06:18,337 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:18,711 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 104 proven. 2890 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2023-03-31 23:06:18,712 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:19,424 INFO L134 CoverageAnalysis]: Checked inductivity of 9012 backedges. 208 proven. 2786 refuted. 0 times theorem prover too weak. 6018 trivial. 0 not checked. [2023-03-31 23:06:19,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215797136] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:19,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [721263468] [2023-03-31 23:06:19,427 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 23:06:19,427 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:19,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:19,427 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:19,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:19,448 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:06:19,602 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-03-31 23:06:19,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:06:19,608 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:20,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5658#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:20,019 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:20,019 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:20,020 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 35 [2023-03-31 23:06:20,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074857950] [2023-03-31 23:06:20,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:20,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-03-31 23:06:20,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:20,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-03-31 23:06:20,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1833, Unknown=0, NotChecked=0, Total=2070 [2023-03-31 23:06:20,023 INFO L87 Difference]: Start difference. First operand 179 states and 233 transitions. Second operand has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) [2023-03-31 23:06:29,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:06:29,337 INFO L93 Difference]: Finished difference Result 605 states and 820 transitions. [2023-03-31 23:06:29,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2023-03-31 23:06:29,339 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) Word has length 378 [2023-03-31 23:06:29,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:06:29,342 INFO L225 Difference]: With dead ends: 605 [2023-03-31 23:06:29,342 INFO L226 Difference]: Without dead ends: 469 [2023-03-31 23:06:29,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1282 GetRequests, 1105 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11197 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=3455, Invalid=28407, Unknown=0, NotChecked=0, Total=31862 [2023-03-31 23:06:29,352 INFO L413 NwaCegarLoop]: 140 mSDtfsCounter, 227 mSDsluCounter, 859 mSDsCounter, 0 mSdLazyCounter, 3658 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 999 SdHoareTripleChecker+Invalid, 3785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 3658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-03-31 23:06:29,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 999 Invalid, 3785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 3658 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-03-31 23:06:29,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2023-03-31 23:06:29,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 449. [2023-03-31 23:06:29,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 302 states have (on average 1.0364238410596027) internal successors, (313), 302 states have internal predecessors, (313), 143 states have call successors, (143), 5 states have call predecessors, (143), 3 states have return successors, (141), 141 states have call predecessors, (141), 141 states have call successors, (141) [2023-03-31 23:06:29,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 597 transitions. [2023-03-31 23:06:29,433 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 597 transitions. Word has length 378 [2023-03-31 23:06:29,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:06:29,434 INFO L495 AbstractCegarLoop]: Abstraction has 449 states and 597 transitions. [2023-03-31 23:06:29,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.914285714285714) internal successors, (102), 35 states have internal predecessors, (102), 30 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (39), 30 states have call predecessors, (39), 30 states have call successors, (39) [2023-03-31 23:06:29,434 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 597 transitions. [2023-03-31 23:06:29,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1001 [2023-03-31 23:06:29,459 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:06:29,460 INFO L195 NwaCegarLoop]: trace histogram [141, 140, 140, 130, 130, 130, 130, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:06:29,475 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 23:06:29,667 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 [2023-03-31 23:06:29,667 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:06:29,667 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:06:29,668 INFO L85 PathProgramCache]: Analyzing trace with hash 1738781521, now seen corresponding path program 4 times [2023-03-31 23:06:29,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:06:29,668 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457787010] [2023-03-31 23:06:29,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:06:29,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:06:30,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:32,554 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 5096 proven. 247 refuted. 0 times theorem prover too weak. 60502 trivial. 0 not checked. [2023-03-31 23:06:32,554 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:06:32,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457787010] [2023-03-31 23:06:32,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457787010] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:06:32,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406847598] [2023-03-31 23:06:32,555 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:06:32,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:06:32,555 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:06:32,557 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) [2023-03-31 23:06:32,561 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 23:06:32,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:06:33,003 INFO L262 TraceCheckSpWp]: Trace formula consists of 2156 conjuncts, 46 conjunts are in the unsatisfiable core [2023-03-31 23:06:33,028 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:06:33,989 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 280 proven. 24413 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2023-03-31 23:06:33,990 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:06:35,902 INFO L134 CoverageAnalysis]: Checked inductivity of 65845 backedges. 373 proven. 24320 refuted. 0 times theorem prover too weak. 41152 trivial. 0 not checked. [2023-03-31 23:06:35,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406847598] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:06:35,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [425641011] [2023-03-31 23:06:35,905 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 23:06:35,905 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:06:35,905 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:06:35,905 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:06:35,905 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:06:35,939 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 8 for LOIs [2023-03-31 23:06:36,173 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-03-31 23:06:36,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 23:06:36,177 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:06:42,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13741#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 23:06:42,659 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:06:42,659 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 23:06:42,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 24, 24] total 60 [2023-03-31 23:06:42,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984191038] [2023-03-31 23:06:42,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 23:06:42,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-03-31 23:06:42,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:06:42,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-03-31 23:06:42,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=690, Invalid=4140, Unknown=0, NotChecked=0, Total=4830 [2023-03-31 23:06:42,664 INFO L87 Difference]: Start difference. First operand 449 states and 597 transitions. Second operand has 60 states, 60 states have (on average 3.1333333333333333) internal successors, (188), 60 states have internal predecessors, (188), 55 states have call successors, (78), 2 states have call predecessors, (78), 1 states have return successors, (76), 55 states have call predecessors, (76), 55 states have call successors, (76)