/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/verifythis/tree_max.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 06:08:33,418 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 06:08:33,420 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 06:08:33,444 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 06:08:33,445 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 06:08:33,446 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 06:08:33,447 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 06:08:33,448 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 06:08:33,450 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 06:08:33,451 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 06:08:33,451 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 06:08:33,452 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 06:08:33,453 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 06:08:33,453 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 06:08:33,454 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 06:08:33,455 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 06:08:33,456 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 06:08:33,457 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 06:08:33,458 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 06:08:33,459 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 06:08:33,461 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 06:08:33,467 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 06:08:33,468 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 06:08:33,468 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 06:08:33,471 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 06:08:33,472 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 06:08:33,472 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 06:08:33,473 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 06:08:33,473 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 06:08:33,474 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 06:08:33,474 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 06:08:33,475 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 06:08:33,475 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 06:08:33,476 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 06:08:33,477 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 06:08:33,477 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 06:08:33,478 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 06:08:33,478 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 06:08:33,478 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 06:08:33,479 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 06:08:33,480 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 06:08:33,486 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 06:08:33,504 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 06:08:33,505 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 06:08:33,505 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 06:08:33,505 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 06:08:33,506 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 06:08:33,506 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 06:08:33,506 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 06:08:33,506 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 06:08:33,506 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 06:08:33,506 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 06:08:33,507 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 06:08:33,507 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 06:08:33,507 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 06:08:33,507 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 06:08:33,507 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 06:08:33,507 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 06:08:33,507 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 06:08:33,508 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 06:08:33,508 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 06:08:33,508 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 06:08:33,508 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 06:08:33,508 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 06:08:33,509 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 06:08:33,509 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 06:08:33,509 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 06:08:33,509 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 06:08:33,509 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 06:08:33,509 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 06:08:33,509 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 06:08:33,510 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 06:08:33,510 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 06:08:33,510 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 06:08:33,510 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 06:08:33,510 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 06:08:33,510 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 06:08:33,510 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 06:08:33,511 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 06:08:33,511 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 06:08:33,511 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 06:08:33,511 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 06:08:33,511 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 06:08:33,511 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 06:08:33,758 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 06:08:33,783 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 06:08:33,785 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 06:08:33,786 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 06:08:33,788 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 06:08:33,789 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max.c [2023-04-01 06:08:34,959 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 06:08:35,124 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 06:08:35,125 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max.c [2023-04-01 06:08:35,130 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8dff31c53/0edf9dcbe2b143f4b7b1a119b15521c7/FLAG59d47c965 [2023-04-01 06:08:35,143 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8dff31c53/0edf9dcbe2b143f4b7b1a119b15521c7 [2023-04-01 06:08:35,145 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 06:08:35,146 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 06:08:35,147 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 06:08:35,148 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 06:08:35,152 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 06:08:35,153 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,154 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3bbfd79c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35, skipping insertion in model container [2023-04-01 06:08:35,154 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,159 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 06:08:35,171 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 06:08:35,279 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/verifythis/tree_max.c[544,557] [2023-04-01 06:08:35,295 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 06:08:35,305 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 06:08:35,315 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/verifythis/tree_max.c[544,557] [2023-04-01 06:08:35,322 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 06:08:35,335 INFO L208 MainTranslator]: Completed translation [2023-04-01 06:08:35,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35 WrapperNode [2023-04-01 06:08:35,335 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 06:08:35,336 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 06:08:35,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 06:08:35,337 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 06:08:35,346 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,346 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,352 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,353 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,360 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,364 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,370 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,371 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,374 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 06:08:35,375 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 06:08:35,375 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 06:08:35,375 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 06:08:35,376 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (1/1) ... [2023-04-01 06:08:35,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 06:08:35,401 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 06:08:35,418 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 06:08:35,440 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 06:08:35,457 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 06:08:35,457 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 06:08:35,458 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 06:08:35,458 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 06:08:35,459 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 06:08:35,459 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2023-04-01 06:08:35,460 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2023-04-01 06:08:35,460 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2023-04-01 06:08:35,460 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2023-04-01 06:08:35,460 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 06:08:35,460 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 06:08:35,460 INFO L130 BoogieDeclarations]: Found specification of procedure free [2023-04-01 06:08:35,460 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 06:08:35,461 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2023-04-01 06:08:35,461 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 06:08:35,461 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 06:08:35,461 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 06:08:35,461 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 06:08:35,461 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 06:08:35,461 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 06:08:35,462 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2023-04-01 06:08:35,462 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 06:08:35,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 06:08:35,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-01 06:08:35,462 INFO L130 BoogieDeclarations]: Found specification of procedure max [2023-04-01 06:08:35,462 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 06:08:35,462 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-01 06:08:35,463 INFO L130 BoogieDeclarations]: Found specification of procedure check [2023-04-01 06:08:35,463 INFO L130 BoogieDeclarations]: Found specification of procedure task [2023-04-01 06:08:35,463 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 06:08:35,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 06:08:35,463 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 06:08:35,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 06:08:35,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 06:08:35,532 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 06:08:35,534 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 06:08:35,692 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 06:08:35,760 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 06:08:35,760 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-04-01 06:08:35,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 06:08:35 BoogieIcfgContainer [2023-04-01 06:08:35,763 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 06:08:35,765 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 06:08:35,765 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 06:08:35,768 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 06:08:35,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 06:08:35" (1/3) ... [2023-04-01 06:08:35,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@611db338 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 06:08:35, skipping insertion in model container [2023-04-01 06:08:35,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 06:08:35" (2/3) ... [2023-04-01 06:08:35,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@611db338 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 06:08:35, skipping insertion in model container [2023-04-01 06:08:35,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 06:08:35" (3/3) ... [2023-04-01 06:08:35,770 INFO L112 eAbstractionObserver]: Analyzing ICFG tree_max.c [2023-04-01 06:08:35,803 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 06:08:35,804 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 06:08:35,886 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 06:08:35,896 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;@e2d22eb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 06:08:35,897 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 06:08:35,901 INFO L276 IsEmpty]: Start isEmpty. Operand has 49 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 28 states have internal predecessors, (33), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-01 06:08:35,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 06:08:35,907 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:08:35,908 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 06:08:35,910 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:08:35,914 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:08:35,915 INFO L85 PathProgramCache]: Analyzing trace with hash 103611096, now seen corresponding path program 1 times [2023-04-01 06:08:35,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:08:35,921 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566628342] [2023-04-01 06:08:35,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:08:35,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:08:36,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:08:36,464 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 06:08:36,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:08:36,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566628342] [2023-04-01 06:08:36,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566628342] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:08:36,465 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:08:36,466 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-04-01 06:08:36,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192078662] [2023-04-01 06:08:36,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:08:36,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 06:08:36,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:08:36,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 06:08:36,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-04-01 06:08:36,501 INFO L87 Difference]: Start difference. First operand has 49 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 28 states have internal predecessors, (33), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 06:08:36,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:08:36,635 INFO L93 Difference]: Finished difference Result 88 states and 113 transitions. [2023-04-01 06:08:36,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 06:08:36,637 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-04-01 06:08:36,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:08:36,645 INFO L225 Difference]: With dead ends: 88 [2023-04-01 06:08:36,645 INFO L226 Difference]: Without dead ends: 41 [2023-04-01 06:08:36,648 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-04-01 06:08:36,651 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 10 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 06:08:36,652 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 326 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 06:08:36,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-04-01 06:08:36,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-04-01 06:08:36,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 25 states have internal predecessors, (26), 13 states have call successors, (13), 7 states have call predecessors, (13), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-04-01 06:08:36,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2023-04-01 06:08:36,695 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 24 [2023-04-01 06:08:36,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:08:36,696 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2023-04-01 06:08:36,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-04-01 06:08:36,698 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2023-04-01 06:08:36,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-01 06:08:36,703 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:08:36,704 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 06:08:36,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 06:08:36,704 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:08:36,707 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:08:36,707 INFO L85 PathProgramCache]: Analyzing trace with hash 1356012771, now seen corresponding path program 1 times [2023-04-01 06:08:36,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:08:36,707 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326100487] [2023-04-01 06:08:36,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:08:36,707 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:08:36,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:08:36,893 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 06:08:36,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:08:36,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326100487] [2023-04-01 06:08:36,893 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326100487] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 06:08:36,893 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 06:08:36,894 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-04-01 06:08:36,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805286927] [2023-04-01 06:08:36,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 06:08:36,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 06:08:36,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:08:36,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 06:08:36,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-04-01 06:08:36,897 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 06:08:37,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:08:37,002 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2023-04-01 06:08:37,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 06:08:37,003 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2023-04-01 06:08:37,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:08:37,004 INFO L225 Difference]: With dead ends: 58 [2023-04-01 06:08:37,004 INFO L226 Difference]: Without dead ends: 43 [2023-04-01 06:08:37,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-04-01 06:08:37,006 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 11 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 06:08:37,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 252 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 06:08:37,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-04-01 06:08:37,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2023-04-01 06:08:37,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 23 states have (on average 1.173913043478261) internal successors, (27), 27 states have internal predecessors, (27), 13 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) [2023-04-01 06:08:37,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2023-04-01 06:08:37,021 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 36 [2023-04-01 06:08:37,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:08:37,021 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2023-04-01 06:08:37,021 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 06:08:37,021 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2023-04-01 06:08:37,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-01 06:08:37,023 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:08:37,023 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 06:08:37,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 06:08:37,023 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:08:37,024 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:08:37,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1799596031, now seen corresponding path program 1 times [2023-04-01 06:08:37,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:08:37,024 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619322165] [2023-04-01 06:08:37,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:08:37,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:08:37,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:08:38,069 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 06:08:38,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:08:38,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619322165] [2023-04-01 06:08:38,071 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619322165] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 06:08:38,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372719169] [2023-04-01 06:08:38,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:08:38,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:08:38,072 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 06:08:38,079 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 06:08:38,081 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 06:08:38,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:08:38,194 INFO L262 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 55 conjunts are in the unsatisfiable core [2023-04-01 06:08:38,201 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 06:08:39,037 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2023-04-01 06:08:39,156 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 06:08:39,157 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 06:08:39,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 14 [2023-04-01 06:08:39,822 INFO L321 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2023-04-01 06:08:39,822 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 18 [2023-04-01 06:08:39,857 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 06:08:39,857 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372719169] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 06:08:39,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [668609857] [2023-04-01 06:08:39,875 INFO L159 IcfgInterpreter]: Started Sifa with 33 locations of interest [2023-04-01 06:08:39,875 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 06:08:39,879 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-04-01 06:08:39,881 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 06:08:39,881 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22, 14] total 39 [2023-04-01 06:08:39,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320293350] [2023-04-01 06:08:39,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 06:08:39,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-04-01 06:08:39,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:08:39,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-04-01 06:08:39,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1356, Unknown=0, NotChecked=0, Total=1482 [2023-04-01 06:08:39,884 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 39 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 25 states have internal predecessors, (47), 14 states have call successors, (23), 7 states have call predecessors, (23), 7 states have return successors, (18), 12 states have call predecessors, (18), 9 states have call successors, (18) [2023-04-01 06:08:40,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:08:40,946 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2023-04-01 06:08:40,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-04-01 06:08:40,947 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 25 states have internal predecessors, (47), 14 states have call successors, (23), 7 states have call predecessors, (23), 7 states have return successors, (18), 12 states have call predecessors, (18), 9 states have call successors, (18) Word has length 48 [2023-04-01 06:08:40,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:08:40,949 INFO L225 Difference]: With dead ends: 62 [2023-04-01 06:08:40,949 INFO L226 Difference]: Without dead ends: 60 [2023-04-01 06:08:40,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 83 SyntacticMatches, 4 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=298, Invalid=3124, Unknown=0, NotChecked=0, Total=3422 [2023-04-01 06:08:40,952 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 80 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 958 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 1004 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 06:08:40,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 302 Invalid, 1004 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 958 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 06:08:40,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-01 06:08:40,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 50. [2023-04-01 06:08:40,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 32 states have internal predecessors, (32), 14 states have call successors, (14), 9 states have call predecessors, (14), 7 states have return successors, (13), 8 states have call predecessors, (13), 9 states have call successors, (13) [2023-04-01 06:08:40,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2023-04-01 06:08:40,971 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 48 [2023-04-01 06:08:40,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:08:40,972 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2023-04-01 06:08:40,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 25 states have internal predecessors, (47), 14 states have call successors, (23), 7 states have call predecessors, (23), 7 states have return successors, (18), 12 states have call predecessors, (18), 9 states have call successors, (18) [2023-04-01 06:08:40,972 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2023-04-01 06:08:40,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-04-01 06:08:40,979 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:08:40,979 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 06:08:40,990 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 06:08:41,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:08:41,188 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:08:41,188 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:08:41,188 INFO L85 PathProgramCache]: Analyzing trace with hash 1573188590, now seen corresponding path program 1 times [2023-04-01 06:08:41,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:08:41,191 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575962756] [2023-04-01 06:08:41,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:08:41,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:08:41,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:08:41,831 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-04-01 06:08:41,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:08:41,834 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575962756] [2023-04-01 06:08:41,834 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575962756] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 06:08:41,834 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127189054] [2023-04-01 06:08:41,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:08:41,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:08:41,834 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 06:08:41,845 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 06:08:41,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 06:08:41,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:08:41,942 INFO L262 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 67 conjunts are in the unsatisfiable core [2023-04-01 06:08:41,955 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 06:08:42,011 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 06:08:42,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 06:08:42,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 06:08:42,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 06:08:42,472 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-01 06:08:42,472 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 06:08:43,069 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-01 06:08:43,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127189054] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 06:08:43,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [820284717] [2023-04-01 06:08:43,073 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2023-04-01 06:08:43,073 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 06:08:43,073 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-04-01 06:08:43,074 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 06:08:43,074 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 15] total 36 [2023-04-01 06:08:43,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189177778] [2023-04-01 06:08:43,074 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 06:08:43,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-01 06:08:43,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:08:43,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-01 06:08:43,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1164, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 06:08:43,077 INFO L87 Difference]: Start difference. First operand 50 states and 59 transitions. Second operand has 36 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 24 states have internal predecessors, (67), 17 states have call successors, (27), 11 states have call predecessors, (27), 10 states have return successors, (22), 16 states have call predecessors, (22), 12 states have call successors, (22) [2023-04-01 06:08:44,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:08:44,861 INFO L93 Difference]: Finished difference Result 144 states and 187 transitions. [2023-04-01 06:08:44,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-04-01 06:08:44,862 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 24 states have internal predecessors, (67), 17 states have call successors, (27), 11 states have call predecessors, (27), 10 states have return successors, (22), 16 states have call predecessors, (22), 12 states have call successors, (22) Word has length 58 [2023-04-01 06:08:44,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:08:44,865 INFO L225 Difference]: With dead ends: 144 [2023-04-01 06:08:44,865 INFO L226 Difference]: Without dead ends: 126 [2023-04-01 06:08:44,867 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 102 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=412, Invalid=4280, Unknown=0, NotChecked=0, Total=4692 [2023-04-01 06:08:44,868 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 132 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 1169 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 1287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 1169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-04-01 06:08:44,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 353 Invalid, 1287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 1169 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-01 06:08:44,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2023-04-01 06:08:44,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 108. [2023-04-01 06:08:44,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 63 states have (on average 1.0952380952380953) internal successors, (69), 68 states have internal predecessors, (69), 29 states have call successors, (29), 17 states have call predecessors, (29), 15 states have return successors, (50), 22 states have call predecessors, (50), 20 states have call successors, (50) [2023-04-01 06:08:44,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 148 transitions. [2023-04-01 06:08:44,890 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 148 transitions. Word has length 58 [2023-04-01 06:08:44,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:08:44,890 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 148 transitions. [2023-04-01 06:08:44,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 24 states have internal predecessors, (67), 17 states have call successors, (27), 11 states have call predecessors, (27), 10 states have return successors, (22), 16 states have call predecessors, (22), 12 states have call successors, (22) [2023-04-01 06:08:44,891 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 148 transitions. [2023-04-01 06:08:44,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-04-01 06:08:44,892 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:08:44,892 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 06:08:44,905 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 06:08:45,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-04-01 06:08:45,099 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:08:45,099 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:08:45,099 INFO L85 PathProgramCache]: Analyzing trace with hash 1729502700, now seen corresponding path program 1 times [2023-04-01 06:08:45,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:08:45,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443503056] [2023-04-01 06:08:45,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:08:45,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:08:45,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:08:45,630 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 06:08:45,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:08:45,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443503056] [2023-04-01 06:08:45,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443503056] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 06:08:45,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418010539] [2023-04-01 06:08:45,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:08:45,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:08:45,631 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 06:08:45,632 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 06:08:45,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 06:08:45,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:08:45,729 INFO L262 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 65 conjunts are in the unsatisfiable core [2023-04-01 06:08:45,731 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 06:08:45,746 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 06:08:45,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-04-01 06:08:46,016 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 06:08:46,017 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 06:08:54,308 WARN L223 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 22 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-01 06:09:00,381 WARN L223 SmtUtils]: Spent 6.02s on a formula simplification that was a NOOP. DAG size: 28 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-01 06:09:00,490 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 06:09:00,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418010539] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 06:09:00,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [922078151] [2023-04-01 06:09:00,493 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2023-04-01 06:09:00,493 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 06:09:00,494 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-04-01 06:09:00,494 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 06:09:00,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 18, 13] total 30 [2023-04-01 06:09:00,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325622709] [2023-04-01 06:09:00,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 06:09:00,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-04-01 06:09:00,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:09:00,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-04-01 06:09:00,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=789, Unknown=1, NotChecked=0, Total=870 [2023-04-01 06:09:00,497 INFO L87 Difference]: Start difference. First operand 108 states and 148 transitions. Second operand has 30 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 22 states have internal predecessors, (58), 15 states have call successors, (26), 8 states have call predecessors, (26), 8 states have return successors, (21), 12 states have call predecessors, (21), 10 states have call successors, (21) [2023-04-01 06:09:01,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:09:01,591 INFO L93 Difference]: Finished difference Result 312 states and 451 transitions. [2023-04-01 06:09:01,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-04-01 06:09:01,593 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 22 states have internal predecessors, (58), 15 states have call successors, (26), 8 states have call predecessors, (26), 8 states have return successors, (21), 12 states have call predecessors, (21), 10 states have call successors, (21) Word has length 58 [2023-04-01 06:09:01,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:09:01,600 INFO L225 Difference]: With dead ends: 312 [2023-04-01 06:09:01,600 INFO L226 Difference]: Without dead ends: 202 [2023-04-01 06:09:01,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=269, Invalid=2592, Unknown=1, NotChecked=0, Total=2862 [2023-04-01 06:09:01,604 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 89 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 684 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 749 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 684 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 06:09:01,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 596 Invalid, 749 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 684 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 06:09:01,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2023-04-01 06:09:01,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 153. [2023-04-01 06:09:01,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 93 states have (on average 1.075268817204301) internal successors, (100), 97 states have internal predecessors, (100), 35 states have call successors, (35), 21 states have call predecessors, (35), 24 states have return successors, (78), 34 states have call predecessors, (78), 25 states have call successors, (78) [2023-04-01 06:09:01,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 213 transitions. [2023-04-01 06:09:01,666 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 213 transitions. Word has length 58 [2023-04-01 06:09:01,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:09:01,666 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 213 transitions. [2023-04-01 06:09:01,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 22 states have internal predecessors, (58), 15 states have call successors, (26), 8 states have call predecessors, (26), 8 states have return successors, (21), 12 states have call predecessors, (21), 10 states have call successors, (21) [2023-04-01 06:09:01,667 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 213 transitions. [2023-04-01 06:09:01,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-04-01 06:09:01,671 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:09:01,671 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 06:09:01,681 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-01 06:09:01,882 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:09:01,882 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:09:01,883 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:09:01,883 INFO L85 PathProgramCache]: Analyzing trace with hash 75823203, now seen corresponding path program 2 times [2023-04-01 06:09:01,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:09:01,883 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933203390] [2023-04-01 06:09:01,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:09:01,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:09:01,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:09:03,752 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 21 proven. 24 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-04-01 06:09:03,752 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:09:03,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933203390] [2023-04-01 06:09:03,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933203390] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 06:09:03,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120676428] [2023-04-01 06:09:03,753 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 06:09:03,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:09:03,753 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 06:09:03,757 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 06:09:03,761 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 06:09:03,935 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-01 06:09:03,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 06:09:03,939 INFO L262 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 111 conjunts are in the unsatisfiable core [2023-04-01 06:09:03,944 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 06:09:03,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 06:09:03,958 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 06:09:05,033 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2023-04-01 06:09:05,037 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-04-01 06:09:05,214 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 06:09:05,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 22 [2023-04-01 06:09:05,320 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 15 proven. 30 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-04-01 06:09:05,320 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 06:09:06,309 INFO L321 Elim1Store]: treesize reduction 22, result has 4.3 percent of original size [2023-04-01 06:09:06,310 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 1 [2023-04-01 06:09:13,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120676428] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 06:09:13,229 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318563697] [2023-04-01 06:09:13,231 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2023-04-01 06:09:13,231 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 06:09:13,232 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-04-01 06:09:13,232 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 06:09:13,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 34] total 58 [2023-04-01 06:09:13,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66897092] [2023-04-01 06:09:13,232 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 06:09:13,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-04-01 06:09:13,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:09:13,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-04-01 06:09:13,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=5154, Unknown=0, NotChecked=0, Total=5402 [2023-04-01 06:09:13,236 INFO L87 Difference]: Start difference. First operand 153 states and 213 transitions. Second operand has 58 states, 40 states have (on average 1.575) internal successors, (63), 38 states have internal predecessors, (63), 22 states have call successors, (27), 9 states have call predecessors, (27), 10 states have return successors, (20), 17 states have call predecessors, (20), 14 states have call successors, (20) [2023-04-01 06:09:15,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 06:09:15,393 INFO L93 Difference]: Finished difference Result 173 states and 240 transitions. [2023-04-01 06:09:15,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-04-01 06:09:15,394 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 40 states have (on average 1.575) internal successors, (63), 38 states have internal predecessors, (63), 22 states have call successors, (27), 9 states have call predecessors, (27), 10 states have return successors, (20), 17 states have call predecessors, (20), 14 states have call successors, (20) Word has length 82 [2023-04-01 06:09:15,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 06:09:15,396 INFO L225 Difference]: With dead ends: 173 [2023-04-01 06:09:15,396 INFO L226 Difference]: Without dead ends: 171 [2023-04-01 06:09:15,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2174 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=520, Invalid=8792, Unknown=0, NotChecked=0, Total=9312 [2023-04-01 06:09:15,400 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 66 mSDsluCounter, 1179 mSDsCounter, 0 mSdLazyCounter, 1946 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 1225 SdHoareTripleChecker+Invalid, 1976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1946 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-04-01 06:09:15,400 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 1225 Invalid, 1976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1946 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-04-01 06:09:15,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2023-04-01 06:09:15,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 154. [2023-04-01 06:09:15,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 93 states have (on average 1.075268817204301) internal successors, (100), 98 states have internal predecessors, (100), 36 states have call successors, (36), 21 states have call predecessors, (36), 24 states have return successors, (78), 34 states have call predecessors, (78), 25 states have call successors, (78) [2023-04-01 06:09:15,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 214 transitions. [2023-04-01 06:09:15,423 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 214 transitions. Word has length 82 [2023-04-01 06:09:15,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 06:09:15,424 INFO L495 AbstractCegarLoop]: Abstraction has 154 states and 214 transitions. [2023-04-01 06:09:15,424 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 40 states have (on average 1.575) internal successors, (63), 38 states have internal predecessors, (63), 22 states have call successors, (27), 9 states have call predecessors, (27), 10 states have return successors, (20), 17 states have call predecessors, (20), 14 states have call successors, (20) [2023-04-01 06:09:15,424 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 214 transitions. [2023-04-01 06:09:15,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-04-01 06:09:15,426 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 06:09:15,426 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 06:09:15,439 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 06:09:15,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:09:15,633 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 06:09:15,634 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 06:09:15,634 INFO L85 PathProgramCache]: Analyzing trace with hash -568745883, now seen corresponding path program 2 times [2023-04-01 06:09:15,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 06:09:15,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007899917] [2023-04-01 06:09:15,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 06:09:15,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 06:09:15,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 06:09:16,922 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-04-01 06:09:16,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 06:09:16,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007899917] [2023-04-01 06:09:16,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007899917] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 06:09:16,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617095238] [2023-04-01 06:09:16,923 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 06:09:16,923 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 06:09:16,923 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 06:09:16,925 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 06:09:16,939 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 06:09:17,054 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 06:09:17,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 06:09:17,057 INFO L262 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 43 conjunts are in the unsatisfiable core [2023-04-01 06:09:17,061 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 06:09:17,159 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 06:09:19,533 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 30 proven. 13 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-04-01 06:09:19,533 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 06:09:20,088 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 10 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-04-01 06:09:20,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617095238] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 06:09:20,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737559150] [2023-04-01 06:09:20,091 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2023-04-01 06:09:20,091 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 06:09:20,091 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-04-01 06:09:20,092 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 06:09:20,092 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 14] total 45 [2023-04-01 06:09:20,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776783669] [2023-04-01 06:09:20,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 06:09:20,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-04-01 06:09:20,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 06:09:20,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-04-01 06:09:20,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1851, Unknown=1, NotChecked=0, Total=1980 [2023-04-01 06:09:20,095 INFO L87 Difference]: Start difference. First operand 154 states and 214 transitions. Second operand has 45 states, 35 states have (on average 2.342857142857143) internal successors, (82), 33 states have internal predecessors, (82), 20 states have call successors, (34), 11 states have call predecessors, (34), 14 states have return successors, (28), 19 states have call predecessors, (28), 16 states have call successors, (28) [2023-04-01 06:09:24,793 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 06:09:26,811 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 06:09:30,865 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 06:09:34,915 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 06:09:36,933 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0]