/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/loop-acceleration/phases_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 05:00:55,537 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 05:00:55,539 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 05:00:55,573 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 05:00:55,574 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 05:00:55,577 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 05:00:55,580 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 05:00:55,585 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 05:00:55,586 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 05:00:55,591 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 05:00:55,593 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 05:00:55,595 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 05:00:55,595 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 05:00:55,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 05:00:55,599 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 05:00:55,600 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 05:00:55,601 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 05:00:55,602 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 05:00:55,604 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 05:00:55,612 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 05:00:55,613 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 05:00:55,614 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 05:00:55,615 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 05:00:55,617 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 05:00:55,624 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 05:00:55,625 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 05:00:55,625 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 05:00:55,626 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 05:00:55,626 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 05:00:55,627 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 05:00:55,627 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 05:00:55,628 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 05:00:55,629 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 05:00:55,630 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 05:00:55,630 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 05:00:55,630 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 05:00:55,631 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 05:00:55,631 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 05:00:55,631 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 05:00:55,632 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 05:00:55,632 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 05:00:55,634 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 05:00:55,661 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 05:00:55,661 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 05:00:55,662 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 05:00:55,662 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 05:00:55,663 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 05:00:55,663 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 05:00:55,663 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 05:00:55,663 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 05:00:55,664 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 05:00:55,664 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 05:00:55,665 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 05:00:55,665 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 05:00:55,665 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 05:00:55,665 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 05:00:55,665 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 05:00:55,665 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 05:00:55,666 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 05:00:55,666 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 05:00:55,666 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 05:00:55,666 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 05:00:55,667 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 05:00:55,667 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 05:00:55,667 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 05:00:55,667 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 05:00:55,667 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 05:00:55,667 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 05:00:55,668 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 05:00:55,668 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 05:00:55,668 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 05:00:55,668 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 05:00:55,668 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 05:00:55,669 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 05:00:55,669 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 05:00:55,669 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 05:00:55,669 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 05:00:55,669 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 05:00:55,669 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 05:00:55,669 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 05:00:55,670 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 05:00:55,670 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 05:00:55,670 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 05:00:55,670 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 05:00:55,912 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 05:00:55,941 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 05:00:55,943 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 05:00:55,945 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 05:00:55,945 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 05:00:55,946 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/phases_1-2.c [2023-04-01 05:00:57,175 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 05:00:57,376 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 05:00:57,376 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-acceleration/phases_1-2.c [2023-04-01 05:00:57,383 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/25616468f/728a0b4181294e56a0d4e179c3271ec6/FLAGbf28f5952 [2023-04-01 05:00:57,395 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/25616468f/728a0b4181294e56a0d4e179c3271ec6 [2023-04-01 05:00:57,397 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 05:00:57,398 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 05:00:57,399 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 05:00:57,399 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 05:00:57,402 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 05:00:57,403 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,404 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7868c055 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57, skipping insertion in model container [2023-04-01 05:00:57,405 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,410 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 05:00:57,422 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 05:00:57,547 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/loop-acceleration/phases_1-2.c[322,335] [2023-04-01 05:00:57,556 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 05:00:57,563 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 05:00:57,571 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/loop-acceleration/phases_1-2.c[322,335] [2023-04-01 05:00:57,574 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 05:00:57,584 INFO L208 MainTranslator]: Completed translation [2023-04-01 05:00:57,585 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57 WrapperNode [2023-04-01 05:00:57,585 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 05:00:57,586 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 05:00:57,586 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 05:00:57,586 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 05:00:57,594 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,594 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,599 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,599 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,607 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,612 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,613 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,614 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 05:00:57,615 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 05:00:57,615 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 05:00:57,616 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 05:00:57,616 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (1/1) ... [2023-04-01 05:00:57,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 05:00:57,630 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:00:57,641 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 05:00:57,643 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 05:00:57,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 05:00:57,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 05:00:57,673 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 05:00:57,674 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 05:00:57,674 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 05:00:57,674 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 05:00:57,674 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 05:00:57,674 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 05:00:57,674 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 05:00:57,674 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 05:00:57,674 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 05:00:57,675 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 05:00:57,675 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 05:00:57,675 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 05:00:57,675 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 05:00:57,675 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 05:00:57,675 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 05:00:57,727 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 05:00:57,729 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 05:00:57,811 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 05:00:57,855 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 05:00:57,855 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 05:00:57,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 05:00:57 BoogieIcfgContainer [2023-04-01 05:00:57,858 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 05:00:57,860 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 05:00:57,860 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 05:00:57,863 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 05:00:57,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 05:00:57" (1/3) ... [2023-04-01 05:00:57,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f825245 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 05:00:57, skipping insertion in model container [2023-04-01 05:00:57,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 05:00:57" (2/3) ... [2023-04-01 05:00:57,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f825245 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 05:00:57, skipping insertion in model container [2023-04-01 05:00:57,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 05:00:57" (3/3) ... [2023-04-01 05:00:57,865 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_1-2.c [2023-04-01 05:00:57,886 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 05:00:57,887 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 05:00:57,919 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 05:00:57,924 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;@30d62ed0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 05:00:57,925 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 05:00:57,927 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 05:00:57,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-01 05:00:57,933 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:00:57,933 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:00:57,934 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:00:57,938 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:00:57,938 INFO L85 PathProgramCache]: Analyzing trace with hash 856397540, now seen corresponding path program 1 times [2023-04-01 05:00:57,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:00:57,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819716658] [2023-04-01 05:00:57,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:00:57,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:00:58,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:00:58,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:00:58,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:00:58,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819716658] [2023-04-01 05:00:58,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819716658] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 05:00:58,191 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 05:00:58,191 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 05:00:58,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837036817] [2023-04-01 05:00:58,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 05:00:58,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 05:00:58,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:00:58,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 05:00:58,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:00:58,229 INFO L87 Difference]: Start difference. First operand has 17 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:00:58,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:00:58,280 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2023-04-01 05:00:58,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 05:00:58,283 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-04-01 05:00:58,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:00:58,288 INFO L225 Difference]: With dead ends: 29 [2023-04-01 05:00:58,288 INFO L226 Difference]: Without dead ends: 12 [2023-04-01 05:00:58,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 05:00:58,307 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:00:58,308 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:00:58,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-04-01 05:00:58,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-04-01 05:00:58,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:00:58,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2023-04-01 05:00:58,335 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2023-04-01 05:00:58,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:00:58,335 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2023-04-01 05:00:58,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:00:58,336 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2023-04-01 05:00:58,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-01 05:00:58,336 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:00:58,336 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:00:58,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 05:00:58,337 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:00:58,337 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:00:58,337 INFO L85 PathProgramCache]: Analyzing trace with hash 839916303, now seen corresponding path program 1 times [2023-04-01 05:00:58,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:00:58,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167001829] [2023-04-01 05:00:58,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:00:58,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:00:58,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:00:58,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:00:58,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:00:58,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167001829] [2023-04-01 05:00:58,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167001829] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:00:58,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133980615] [2023-04-01 05:00:58,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:00:58,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:00:58,578 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:00:58,581 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:00:58,582 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 05:00:58,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:00:58,628 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 05:00:58,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:00:58,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:00:58,679 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:00:59,000 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:00:59,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133980615] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:00:59,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [997831861] [2023-04-01 05:00:59,042 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-01 05:00:59,042 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:00:59,046 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:00:59,049 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:00:59,050 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:00:59,136 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:00:59,180 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-01 05:00:59,207 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:00:59,214 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:00:59,487 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '155#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:00:59,488 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:00:59,488 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:00:59,488 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 7] total 10 [2023-04-01 05:00:59,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095356413] [2023-04-01 05:00:59,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:00:59,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 05:00:59,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:00:59,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 05:00:59,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2023-04-01 05:00:59,491 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:00:59,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:00:59,586 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2023-04-01 05:00:59,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 05:00:59,587 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-04-01 05:00:59,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:00:59,588 INFO L225 Difference]: With dead ends: 24 [2023-04-01 05:00:59,588 INFO L226 Difference]: Without dead ends: 16 [2023-04-01 05:00:59,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2023-04-01 05:00:59,590 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 1 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 05:00:59,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 28 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 05:00:59,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-01 05:00:59,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-04-01 05:00:59,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:00:59,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2023-04-01 05:00:59,595 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2023-04-01 05:00:59,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:00:59,595 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2023-04-01 05:00:59,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:00:59,595 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2023-04-01 05:00:59,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 05:00:59,596 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:00:59,596 INFO L195 NwaCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:00:59,605 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 05:00:59,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:00:59,797 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:00:59,797 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:00:59,798 INFO L85 PathProgramCache]: Analyzing trace with hash 899760207, now seen corresponding path program 2 times [2023-04-01 05:00:59,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:00:59,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755072336] [2023-04-01 05:00:59,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:00:59,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:00:59,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:01:00,234 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:01:00,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:01:00,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755072336] [2023-04-01 05:01:00,237 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755072336] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:01:00,237 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491568801] [2023-04-01 05:01:00,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 05:01:00,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:01:00,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:01:00,241 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:01:00,244 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 05:01:00,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 05:01:00,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:01:00,299 INFO L262 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-01 05:01:00,301 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:01:00,425 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:01:00,425 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:01:01,269 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:01:01,269 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491568801] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:01:01,269 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [690492302] [2023-04-01 05:01:01,271 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-01 05:01:01,271 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:01:01,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:01:01,272 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:01:01,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:01:01,309 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:01:01,342 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-01 05:01:01,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:01:01,368 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:01:01,768 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '340#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:01:01,768 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:01:01,769 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:01:01,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 18 [2023-04-01 05:01:01,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678175989] [2023-04-01 05:01:01,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:01:01,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-01 05:01:01,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:01:01,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-01 05:01:01,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2023-04-01 05:01:01,771 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:01:03,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 05:01:03,664 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2023-04-01 05:01:03,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-01 05:01:03,664 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-01 05:01:03,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 05:01:03,665 INFO L225 Difference]: With dead ends: 32 [2023-04-01 05:01:03,665 INFO L226 Difference]: Without dead ends: 24 [2023-04-01 05:01:03,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=235, Invalid=887, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 05:01:03,667 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 1 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 05:01:03,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 48 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 05:01:03,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-01 05:01:03,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-04-01 05:01:03,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:01:03,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2023-04-01 05:01:03,675 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 15 [2023-04-01 05:01:03,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 05:01:03,675 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2023-04-01 05:01:03,676 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 05:01:03,676 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2023-04-01 05:01:03,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-01 05:01:03,676 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 05:01:03,676 INFO L195 NwaCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 05:01:03,686 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 05:01:03,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 05:01:03,884 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 05:01:03,885 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 05:01:03,885 INFO L85 PathProgramCache]: Analyzing trace with hash -313152817, now seen corresponding path program 3 times [2023-04-01 05:01:03,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 05:01:03,885 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448445144] [2023-04-01 05:01:03,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 05:01:03,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 05:01:03,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 05:01:04,756 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:01:04,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 05:01:04,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448445144] [2023-04-01 05:01:04,757 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448445144] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 05:01:04,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676651901] [2023-04-01 05:01:04,757 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 05:01:04,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 05:01:04,757 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 05:01:04,759 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 05:01:04,762 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 05:01:04,830 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 05:01:04,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 05:01:04,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 34 conjunts are in the unsatisfiable core [2023-04-01 05:01:04,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 05:01:05,142 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:01:05,144 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 05:01:25,219 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 05:01:25,220 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676651901] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 05:01:25,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [601810815] [2023-04-01 05:01:25,222 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-04-01 05:01:25,222 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 05:01:25,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 05:01:25,222 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 05:01:25,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 05:01:25,236 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-01 05:01:25,256 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-04-01 05:01:25,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 05:01:25,270 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 05:01:28,139 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '633#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 05:01:28,140 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 05:01:28,140 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 05:01:28,140 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 19] total 34 [2023-04-01 05:01:28,140 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866426315] [2023-04-01 05:01:28,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 05:01:28,140 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-04-01 05:01:28,140 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 05:01:28,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-04-01 05:01:28,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=1373, Unknown=2, NotChecked=0, Total=1722 [2023-04-01 05:01:28,144 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 34 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 33 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)