/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/array-crafted/zero_sum_m5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 14:58:08,508 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 14:58:08,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 14:58:08,532 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 14:58:08,532 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 14:58:08,533 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 14:58:08,534 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 14:58:08,535 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 14:58:08,536 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 14:58:08,537 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 14:58:08,538 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 14:58:08,539 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 14:58:08,539 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 14:58:08,540 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 14:58:08,541 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 14:58:08,542 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 14:58:08,542 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 14:58:08,543 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 14:58:08,544 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 14:58:08,546 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 14:58:08,547 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 14:58:08,548 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 14:58:08,548 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 14:58:08,549 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 14:58:08,551 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 14:58:08,552 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 14:58:08,552 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 14:58:08,552 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 14:58:08,553 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 14:58:08,554 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 14:58:08,554 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 14:58:08,554 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 14:58:08,555 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 14:58:08,555 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 14:58:08,556 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 14:58:08,556 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 14:58:08,557 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 14:58:08,557 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 14:58:08,557 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 14:58:08,558 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 14:58:08,558 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 14:58:08,559 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 14:58:08,587 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 14:58:08,587 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 14:58:08,587 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 14:58:08,587 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 14:58:08,588 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 14:58:08,588 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 14:58:08,588 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 14:58:08,589 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 14:58:08,589 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 14:58:08,589 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 14:58:08,589 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 14:58:08,589 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 14:58:08,590 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 14:58:08,590 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 14:58:08,590 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 14:58:08,590 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 14:58:08,590 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 14:58:08,591 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 14:58:08,591 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 14:58:08,591 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 14:58:08,592 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 14:58:08,592 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 14:58:08,592 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 14:58:08,592 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 14:58:08,597 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 14:58:08,598 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 14:58:08,599 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 14:58:08,599 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 14:58:08,599 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 14:58:08,599 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 14:58:08,600 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 14:58:08,600 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 14:58:08,600 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:58:08,600 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 14:58:08,600 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 14:58:08,601 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 14:58:08,601 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 14:58:08,601 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 14:58:08,601 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 14:58:08,602 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 14:58:08,602 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 14:58:08,602 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 14:58:08,818 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 14:58:08,840 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 14:58:08,842 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 14:58:08,843 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 14:58:08,844 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 14:58:08,845 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum_m5.c [2023-04-02 14:58:10,007 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 14:58:10,162 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 14:58:10,163 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_m5.c [2023-04-02 14:58:10,170 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e38559f08/574503eeaee54ae5a81a0a7dfe221896/FLAGa8837045c [2023-04-02 14:58:10,181 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e38559f08/574503eeaee54ae5a81a0a7dfe221896 [2023-04-02 14:58:10,183 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 14:58:10,184 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 14:58:10,188 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 14:58:10,188 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 14:58:10,198 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 14:58:10,199 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,200 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11f96f1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10, skipping insertion in model container [2023-04-02 14:58:10,200 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,206 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 14:58:10,217 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 14:58:10,354 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/array-crafted/zero_sum_m5.c[402,415] [2023-04-02 14:58:10,391 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:58:10,399 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 14:58:10,410 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/array-crafted/zero_sum_m5.c[402,415] [2023-04-02 14:58:10,434 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:58:10,448 INFO L208 MainTranslator]: Completed translation [2023-04-02 14:58:10,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10 WrapperNode [2023-04-02 14:58:10,449 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 14:58:10,450 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 14:58:10,450 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 14:58:10,450 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 14:58:10,459 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,460 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,472 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,473 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,488 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,493 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,494 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,494 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,496 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 14:58:10,499 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 14:58:10,499 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 14:58:10,499 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 14:58:10,500 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (1/1) ... [2023-04-02 14:58:10,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:58:10,516 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:10,530 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 14:58:10,553 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 14:58:10,565 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 14:58:10,565 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 14:58:10,565 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 14:58:10,565 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 14:58:10,565 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 14:58:10,565 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 14:58:10,565 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 14:58:10,566 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 14:58:10,566 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 14:58:10,566 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 14:58:10,566 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 14:58:10,566 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 14:58:10,566 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2023-04-02 14:58:10,566 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 14:58:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 14:58:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 14:58:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 14:58:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 14:58:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 14:58:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 14:58:10,567 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 14:58:10,634 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 14:58:10,636 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 14:58:10,851 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 14:58:10,962 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 14:58:10,962 INFO L302 CfgBuilder]: Removed 11 assume(true) statements. [2023-04-02 14:58:10,970 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:58:10 BoogieIcfgContainer [2023-04-02 14:58:10,971 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 14:58:10,974 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 14:58:10,974 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 14:58:10,976 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 14:58:10,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 02:58:10" (1/3) ... [2023-04-02 14:58:10,977 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5363bed1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:58:10, skipping insertion in model container [2023-04-02 14:58:10,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:58:10" (2/3) ... [2023-04-02 14:58:10,978 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5363bed1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:58:10, skipping insertion in model container [2023-04-02 14:58:10,978 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:58:10" (3/3) ... [2023-04-02 14:58:10,979 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m5.c [2023-04-02 14:58:10,993 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 14:58:10,993 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 14:58:11,042 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 14:58:11,049 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;@4361d460, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 14:58:11,049 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 14:58:11,052 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 21 states have (on average 1.6666666666666667) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 14:58:11,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 14:58:11,058 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:11,059 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] [2023-04-02 14:58:11,060 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:11,067 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:11,067 INFO L85 PathProgramCache]: Analyzing trace with hash -859050196, now seen corresponding path program 1 times [2023-04-02 14:58:11,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:11,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832552037] [2023-04-02 14:58:11,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:11,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:11,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:11,378 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:58:11,378 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:11,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832552037] [2023-04-02 14:58:11,379 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832552037] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:58:11,380 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:58:11,380 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 14:58:11,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968931601] [2023-04-02 14:58:11,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:58:11,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:58:11,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:11,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:58:11,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:58:11,408 INFO L87 Difference]: Start difference. First operand has 29 states, 21 states have (on average 1.6666666666666667) internal successors, (35), 22 states have internal predecessors, (35), 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 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:11,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:11,507 INFO L93 Difference]: Finished difference Result 52 states and 76 transitions. [2023-04-02 14:58:11,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:58:11,509 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2023-04-02 14:58:11,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:11,514 INFO L225 Difference]: With dead ends: 52 [2023-04-02 14:58:11,514 INFO L226 Difference]: Without dead ends: 23 [2023-04-02 14:58:11,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:58:11,521 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:11,522 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:58:11,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-04-02 14:58:11,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-04-02 14:58:11,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:11,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 33 transitions. [2023-04-02 14:58:11,554 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 33 transitions. Word has length 21 [2023-04-02 14:58:11,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:11,555 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 33 transitions. [2023-04-02 14:58:11,555 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:11,555 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 33 transitions. [2023-04-02 14:58:11,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-02 14:58:11,556 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:11,556 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] [2023-04-02 14:58:11,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 14:58:11,557 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:11,558 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:11,558 INFO L85 PathProgramCache]: Analyzing trace with hash 904361541, now seen corresponding path program 1 times [2023-04-02 14:58:11,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:11,558 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525379904] [2023-04-02 14:58:11,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:11,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:11,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:11,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 14:58:11,745 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:11,745 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525379904] [2023-04-02 14:58:11,745 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525379904] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:58:11,745 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:58:11,746 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 14:58:11,746 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523167475] [2023-04-02 14:58:11,746 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:58:11,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 14:58:11,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:11,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 14:58:11,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 14:58:11,748 INFO L87 Difference]: Start difference. First operand 23 states and 33 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:11,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:11,832 INFO L93 Difference]: Finished difference Result 47 states and 75 transitions. [2023-04-02 14:58:11,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 14:58:11,832 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2023-04-02 14:58:11,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:11,833 INFO L225 Difference]: With dead ends: 47 [2023-04-02 14:58:11,833 INFO L226 Difference]: Without dead ends: 33 [2023-04-02 14:58:11,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 14:58:11,835 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 25 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:11,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 18 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:58:11,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-02 14:58:11,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-04-02 14:58:11,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 28 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:11,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2023-04-02 14:58:11,843 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 22 [2023-04-02 14:58:11,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:11,844 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2023-04-02 14:58:11,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:11,844 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2023-04-02 14:58:11,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-02 14:58:11,845 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:11,845 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, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:58:11,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 14:58:11,845 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:11,846 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:11,846 INFO L85 PathProgramCache]: Analyzing trace with hash -310772173, now seen corresponding path program 1 times [2023-04-02 14:58:11,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:11,846 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847686702] [2023-04-02 14:58:11,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:11,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:11,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:11,978 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:58:11,978 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:11,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847686702] [2023-04-02 14:58:11,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [847686702] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:11,979 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103031050] [2023-04-02 14:58:11,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:11,979 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:11,979 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:11,982 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:11,993 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 14:58:12,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:12,078 INFO L262 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 14:58:12,083 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:12,133 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:58:12,133 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:58:12,162 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:58:12,163 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103031050] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:58:12,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738624575] [2023-04-02 14:58:12,178 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:58:12,178 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:58:12,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:58:12,190 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:58:12,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:58:12,365 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:58:13,108 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:58:13,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:58:13,124 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:58:13,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '505#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:58:13,594 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:58:13,594 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:58:13,594 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 14:58:13,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692392699] [2023-04-02 14:58:13,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:58:13,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 14:58:13,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:13,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 14:58:13,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-04-02 14:58:13,600 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:13,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:13,674 INFO L93 Difference]: Finished difference Result 59 states and 79 transitions. [2023-04-02 14:58:13,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 14:58:13,675 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 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 32 [2023-04-02 14:58:13,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:13,675 INFO L225 Difference]: With dead ends: 59 [2023-04-02 14:58:13,675 INFO L226 Difference]: Without dead ends: 34 [2023-04-02 14:58:13,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-04-02 14:58:13,677 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:13,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:58:13,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-02 14:58:13,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-04-02 14:58:13,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:13,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2023-04-02 14:58:13,683 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 32 [2023-04-02 14:58:13,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:13,683 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2023-04-02 14:58:13,683 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:13,683 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2023-04-02 14:58:13,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-02 14:58:13,684 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:13,684 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-04-02 14:58:13,694 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 14:58:13,894 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 [2023-04-02 14:58:13,895 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:13,895 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:13,895 INFO L85 PathProgramCache]: Analyzing trace with hash -1005765254, now seen corresponding path program 2 times [2023-04-02 14:58:13,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:13,896 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441094776] [2023-04-02 14:58:13,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:13,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:13,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:14,010 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:58:14,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:14,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441094776] [2023-04-02 14:58:14,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441094776] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:14,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122245705] [2023-04-02 14:58:14,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:58:14,011 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:14,011 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:14,015 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:14,018 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 14:58:14,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 14:58:14,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:58:14,099 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 14:58:14,101 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:14,141 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:58:14,142 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:58:14,177 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:58:14,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122245705] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:58:14,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1985644277] [2023-04-02 14:58:14,185 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:58:14,185 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:58:14,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:58:14,186 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:58:14,186 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:58:14,223 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:58:14,668 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:58:14,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:58:14,680 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:58:15,070 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '892#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:58:15,071 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:58:15,071 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:58:15,071 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-04-02 14:58:15,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600060990] [2023-04-02 14:58:15,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:58:15,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 14:58:15,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:15,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 14:58:15,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2023-04-02 14:58:15,073 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 8 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:15,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:15,161 INFO L93 Difference]: Finished difference Result 67 states and 95 transitions. [2023-04-02 14:58:15,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 14:58:15,162 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2023-04-02 14:58:15,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:15,162 INFO L225 Difference]: With dead ends: 67 [2023-04-02 14:58:15,162 INFO L226 Difference]: Without dead ends: 44 [2023-04-02 14:58:15,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2023-04-02 14:58:15,164 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 27 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:15,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 27 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:58:15,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-04-02 14:58:15,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2023-04-02 14:58:15,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 39 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:15,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2023-04-02 14:58:15,170 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 33 [2023-04-02 14:58:15,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:15,170 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2023-04-02 14:58:15,170 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:15,170 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2023-04-02 14:58:15,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-04-02 14:58:15,171 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:15,171 INFO L195 NwaCegarLoop]: trace histogram [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, 1] [2023-04-02 14:58:15,183 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 14:58:15,378 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 [2023-04-02 14:58:15,378 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:15,378 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:15,379 INFO L85 PathProgramCache]: Analyzing trace with hash 54401420, now seen corresponding path program 3 times [2023-04-02 14:58:15,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:15,379 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129772507] [2023-04-02 14:58:15,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:15,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:15,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:19,137 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:58:19,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:19,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129772507] [2023-04-02 14:58:19,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129772507] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:19,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248329469] [2023-04-02 14:58:19,138 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:58:19,138 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:19,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:19,141 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:19,165 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 14:58:19,221 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:58:19,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:58:19,223 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 96 conjunts are in the unsatisfiable core [2023-04-02 14:58:19,226 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:19,264 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 13 treesize of output 9 [2023-04-02 14:58:19,978 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:58:19,980 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:58:19,980 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 31 treesize of output 14 [2023-04-02 14:58:20,077 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:58:20,077 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:58:21,577 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 14:58:21,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248329469] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:58:21,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1952378441] [2023-04-02 14:58:21,580 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:58:21,580 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:58:21,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:58:21,580 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:58:21,581 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:58:21,618 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:58:22,020 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:58:22,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:58:22,029 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:58:22,899 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1423#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:58:22,900 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:58:22,900 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:58:22,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 30] total 56 [2023-04-02 14:58:22,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529669939] [2023-04-02 14:58:22,900 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:58:22,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2023-04-02 14:58:22,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:22,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2023-04-02 14:58:22,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=4238, Unknown=0, NotChecked=0, Total=4422 [2023-04-02 14:58:22,903 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand has 56 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 54 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:23,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:23,881 INFO L93 Difference]: Finished difference Result 77 states and 96 transitions. [2023-04-02 14:58:23,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-02 14:58:23,882 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 54 states have internal predecessors, (73), 2 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 43 [2023-04-02 14:58:23,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:23,883 INFO L225 Difference]: With dead ends: 77 [2023-04-02 14:58:23,883 INFO L226 Difference]: Without dead ends: 72 [2023-04-02 14:58:23,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 78 SyntacticMatches, 22 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1236 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=190, Invalid=4366, Unknown=0, NotChecked=0, Total=4556 [2023-04-02 14:58:23,885 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 1803 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 1804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:23,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 237 Invalid, 1804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1803 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 14:58:23,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-04-02 14:58:23,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2023-04-02 14:58:23,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.3076923076923077) internal successors, (85), 65 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:23,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2023-04-02 14:58:23,896 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 43 [2023-04-02 14:58:23,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:23,896 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2023-04-02 14:58:23,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.3035714285714286) internal successors, (73), 54 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:23,897 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2023-04-02 14:58:23,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-02 14:58:23,898 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:23,898 INFO L195 NwaCegarLoop]: trace histogram [3, 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, 1] [2023-04-02 14:58:23,903 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-02 14:58:24,100 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 [2023-04-02 14:58:24,101 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:24,101 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:24,102 INFO L85 PathProgramCache]: Analyzing trace with hash -1485400106, now seen corresponding path program 4 times [2023-04-02 14:58:24,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:24,102 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939454146] [2023-04-02 14:58:24,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:24,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:24,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:24,225 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-04-02 14:58:24,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:24,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939454146] [2023-04-02 14:58:24,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939454146] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:24,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238635793] [2023-04-02 14:58:24,226 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:58:24,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:24,226 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:24,229 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:24,252 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 14:58:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:24,311 INFO L262 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 14:58:24,315 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:24,376 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-04-02 14:58:24,376 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:58:24,435 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-04-02 14:58:24,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238635793] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:58:24,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1611621808] [2023-04-02 14:58:24,440 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:58:24,440 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:58:24,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:58:24,445 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:58:24,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:58:24,475 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:58:24,827 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:58:24,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:58:24,836 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:58:25,236 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1992#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:58:25,236 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:58:25,236 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:58:25,236 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-02 14:58:25,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718339176] [2023-04-02 14:58:25,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:58:25,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 14:58:25,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:25,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 14:58:25,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2023-04-02 14:58:25,239 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:25,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:25,417 INFO L93 Difference]: Finished difference Result 134 states and 172 transitions. [2023-04-02 14:58:25,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 14:58:25,417 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2023-04-02 14:58:25,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:25,418 INFO L225 Difference]: With dead ends: 134 [2023-04-02 14:58:25,418 INFO L226 Difference]: Without dead ends: 71 [2023-04-02 14:58:25,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 112 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2023-04-02 14:58:25,419 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:25,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 29 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:58:25,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-04-02 14:58:25,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2023-04-02 14:58:25,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.303030303030303) internal successors, (86), 66 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:25,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 90 transitions. [2023-04-02 14:58:25,430 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 90 transitions. Word has length 44 [2023-04-02 14:58:25,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:25,430 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 90 transitions. [2023-04-02 14:58:25,430 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:25,430 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 90 transitions. [2023-04-02 14:58:25,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-02 14:58:25,431 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:25,431 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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, 1] [2023-04-02 14:58:25,440 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 14:58:25,632 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 [2023-04-02 14:58:25,632 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:25,633 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:25,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1636162403, now seen corresponding path program 5 times [2023-04-02 14:58:25,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:25,633 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184645519] [2023-04-02 14:58:25,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:25,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:25,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:25,734 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 14:58:25,734 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:25,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184645519] [2023-04-02 14:58:25,734 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184645519] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:25,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964652459] [2023-04-02 14:58:25,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:58:25,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:25,735 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:25,736 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:25,738 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 14:58:25,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 14:58:25,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:58:25,814 INFO L262 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 14:58:25,815 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:25,884 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 14:58:25,884 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:58:25,944 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 14:58:25,944 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1964652459] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:58:25,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [446331898] [2023-04-02 14:58:25,946 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:58:25,946 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:58:25,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:58:25,946 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:58:25,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:58:25,963 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:58:26,305 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:58:26,311 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:58:26,314 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:58:26,667 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2687#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:58:26,667 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:58:26,667 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:58:26,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-02 14:58:26,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167463098] [2023-04-02 14:58:26,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:58:26,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 14:58:26,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:26,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 14:58:26,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2023-04-02 14:58:26,669 INFO L87 Difference]: Start difference. First operand 71 states and 90 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:26,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:26,817 INFO L93 Difference]: Finished difference Result 110 states and 146 transitions. [2023-04-02 14:58:26,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 14:58:26,818 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 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 45 [2023-04-02 14:58:26,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:26,818 INFO L225 Difference]: With dead ends: 110 [2023-04-02 14:58:26,818 INFO L226 Difference]: Without dead ends: 55 [2023-04-02 14:58:26,819 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 114 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2023-04-02 14:58:26,820 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 118 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:26,820 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 48 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:58:26,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-04-02 14:58:26,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-04-02 14:58:26,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.22) internal successors, (61), 50 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:26,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 65 transitions. [2023-04-02 14:58:26,826 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 65 transitions. Word has length 45 [2023-04-02 14:58:26,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:26,827 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 65 transitions. [2023-04-02 14:58:26,827 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 14 states have internal predecessors, (55), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:26,827 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 65 transitions. [2023-04-02 14:58:26,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 14:58:26,827 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:26,828 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:58:26,835 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 14:58:27,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:27,041 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:27,041 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:27,042 INFO L85 PathProgramCache]: Analyzing trace with hash -1590777389, now seen corresponding path program 6 times [2023-04-02 14:58:27,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:27,042 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339027601] [2023-04-02 14:58:27,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:27,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:27,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:32,522 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:58:32,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:32,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339027601] [2023-04-02 14:58:32,523 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [339027601] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:32,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305465767] [2023-04-02 14:58:32,523 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:58:32,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:32,523 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:32,531 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:32,532 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 14:58:32,611 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:58:32,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:58:32,614 INFO L262 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 138 conjunts are in the unsatisfiable core [2023-04-02 14:58:32,618 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:32,645 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 13 treesize of output 9 [2023-04-02 14:58:34,464 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:58:34,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:58:34,465 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:58:34,468 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:58:34,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 23 [2023-04-02 14:58:34,605 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:58:34,605 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:58:37,772 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 14:58:37,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305465767] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:58:37,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [909878012] [2023-04-02 14:58:37,774 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:58:37,774 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:58:37,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:58:37,775 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:58:37,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:58:37,800 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:58:38,108 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:58:38,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:58:38,119 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:58:39,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3447#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:58:39,342 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:58:39,342 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:58:39,342 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 40, 40] total 103 [2023-04-02 14:58:39,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882349917] [2023-04-02 14:58:39,342 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:58:39,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2023-04-02 14:58:39,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:39,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2023-04-02 14:58:39,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=12525, Unknown=0, NotChecked=0, Total=12882 [2023-04-02 14:58:39,349 INFO L87 Difference]: Start difference. First operand 55 states and 65 transitions. Second operand has 103 states, 103 states have (on average 1.2233009708737863) internal successors, (126), 101 states have internal predecessors, (126), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:45,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:45,581 INFO L93 Difference]: Finished difference Result 144 states and 177 transitions. [2023-04-02 14:58:45,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-04-02 14:58:45,582 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.2233009708737863) internal successors, (126), 101 states have internal predecessors, (126), 2 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 54 [2023-04-02 14:58:45,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:45,584 INFO L225 Difference]: With dead ends: 144 [2023-04-02 14:58:45,584 INFO L226 Difference]: Without dead ends: 139 [2023-04-02 14:58:45,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 85 SyntacticMatches, 13 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5003 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=714, Invalid=21338, Unknown=0, NotChecked=0, Total=22052 [2023-04-02 14:58:45,589 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 10 mSDsluCounter, 390 mSDsCounter, 0 mSdLazyCounter, 5436 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 398 SdHoareTripleChecker+Invalid, 5589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 5436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:45,589 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 398 Invalid, 5589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 5436 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2023-04-02 14:58:45,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2023-04-02 14:58:45,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 90. [2023-04-02 14:58:45,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.2470588235294118) internal successors, (106), 85 states have internal predecessors, (106), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:45,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 110 transitions. [2023-04-02 14:58:45,611 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 110 transitions. Word has length 54 [2023-04-02 14:58:45,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:45,612 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 110 transitions. [2023-04-02 14:58:45,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.2233009708737863) internal successors, (126), 101 states have internal predecessors, (126), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:45,612 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 110 transitions. [2023-04-02 14:58:45,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-04-02 14:58:45,613 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:45,613 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:58:45,619 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-02 14:58:45,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:45,817 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:45,818 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:45,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1265042277, now seen corresponding path program 7 times [2023-04-02 14:58:45,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:45,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166605909] [2023-04-02 14:58:45,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:45,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:45,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:45,962 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-04-02 14:58:45,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:45,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166605909] [2023-04-02 14:58:45,962 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166605909] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:45,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861481978] [2023-04-02 14:58:45,962 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:58:45,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:45,963 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:45,965 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:45,975 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 14:58:46,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:46,056 INFO L262 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 14:58:46,061 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:46,138 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-04-02 14:58:46,138 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:58:46,216 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-04-02 14:58:46,216 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861481978] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:58:46,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2095937226] [2023-04-02 14:58:46,219 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:58:46,219 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:58:46,219 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:58:46,219 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:58:46,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:58:46,234 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:58:46,525 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:58:46,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:58:46,532 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:58:46,884 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4327#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:58:46,884 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:58:46,884 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:58:46,884 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-04-02 14:58:46,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774875840] [2023-04-02 14:58:46,884 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:58:46,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 14:58:46,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:46,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 14:58:46,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=650, Unknown=0, NotChecked=0, Total=756 [2023-04-02 14:58:46,886 INFO L87 Difference]: Start difference. First operand 90 states and 110 transitions. Second operand has 17 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 17 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:47,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:47,115 INFO L93 Difference]: Finished difference Result 199 states and 245 transitions. [2023-04-02 14:58:47,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 14:58:47,117 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 17 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2023-04-02 14:58:47,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:47,118 INFO L225 Difference]: With dead ends: 199 [2023-04-02 14:58:47,118 INFO L226 Difference]: Without dead ends: 91 [2023-04-02 14:58:47,119 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 142 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=146, Invalid=846, Unknown=0, NotChecked=0, Total=992 [2023-04-02 14:58:47,119 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:47,119 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 33 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:58:47,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-04-02 14:58:47,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2023-04-02 14:58:47,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.244186046511628) internal successors, (107), 86 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:47,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 111 transitions. [2023-04-02 14:58:47,142 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 111 transitions. Word has length 55 [2023-04-02 14:58:47,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:47,142 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 111 transitions. [2023-04-02 14:58:47,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 17 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:47,142 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 111 transitions. [2023-04-02 14:58:47,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-02 14:58:47,143 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:47,143 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:58:47,152 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 14:58:47,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:47,352 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:47,352 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:47,352 INFO L85 PathProgramCache]: Analyzing trace with hash 1866300788, now seen corresponding path program 8 times [2023-04-02 14:58:47,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:47,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789680149] [2023-04-02 14:58:47,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:47,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:47,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:47,488 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-04-02 14:58:47,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:47,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789680149] [2023-04-02 14:58:47,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789680149] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:47,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161370675] [2023-04-02 14:58:47,489 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:58:47,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:47,490 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:47,493 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:47,520 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 14:58:47,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 14:58:47,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:58:47,593 INFO L262 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 14:58:47,595 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:47,669 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-04-02 14:58:47,669 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:58:47,741 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-04-02 14:58:47,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161370675] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:58:47,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [388675546] [2023-04-02 14:58:47,745 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:58:47,745 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:58:47,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:58:47,746 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:58:47,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:58:47,761 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:58:48,030 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:58:48,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:58:48,038 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:58:48,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5263#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:58:48,383 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:58:48,383 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:58:48,383 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-04-02 14:58:48,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977400311] [2023-04-02 14:58:48,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:58:48,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 14:58:48,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:58:48,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 14:58:48,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2023-04-02 14:58:48,385 INFO L87 Difference]: Start difference. First operand 91 states and 111 transitions. Second operand has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:48,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:58:48,540 INFO L93 Difference]: Finished difference Result 138 states and 175 transitions. [2023-04-02 14:58:48,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 14:58:48,540 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 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 56 [2023-04-02 14:58:48,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:58:48,541 INFO L225 Difference]: With dead ends: 138 [2023-04-02 14:58:48,541 INFO L226 Difference]: Without dead ends: 66 [2023-04-02 14:58:48,542 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 144 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=175, Invalid=881, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 14:58:48,542 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 152 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:58:48,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 71 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:58:48,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-04-02 14:58:48,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2023-04-02 14:58:48,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.180327868852459) internal successors, (72), 61 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:48,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2023-04-02 14:58:48,563 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 56 [2023-04-02 14:58:48,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:58:48,564 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2023-04-02 14:58:48,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:58:48,564 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2023-04-02 14:58:48,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-04-02 14:58:48,565 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:58:48,565 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:58:48,570 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 14:58:48,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 14:58:48,769 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:58:48,769 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:58:48,769 INFO L85 PathProgramCache]: Analyzing trace with hash -1302623252, now seen corresponding path program 9 times [2023-04-02 14:58:48,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:58:48,769 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947430512] [2023-04-02 14:58:48,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:58:48,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:58:48,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:58:55,290 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 2 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:58:55,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:58:55,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947430512] [2023-04-02 14:58:55,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947430512] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:58:55,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244110725] [2023-04-02 14:58:55,291 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:58:55,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:58:55,291 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:58:55,293 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:58:55,317 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 14:58:55,393 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:58:55,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:58:55,396 WARN L260 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 182 conjunts are in the unsatisfiable core [2023-04-02 14:58:55,401 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:58:55,450 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 [2023-04-02 14:58:58,296 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:58:58,296 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:59:03,525 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:59:03,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244110725] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:59:03,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1889766162] [2023-04-02 14:59:03,527 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:59:03,527 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:59:03,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:59:03,527 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:59:03,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:59:03,548 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:59:03,818 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:59:03,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:59:03,824 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:59:05,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6205#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:59:05,349 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:59:05,350 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:59:05,350 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 51, 50] total 139 [2023-04-02 14:59:05,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806486362] [2023-04-02 14:59:05,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:59:05,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2023-04-02 14:59:05,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:59:05,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2023-04-02 14:59:05,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=21865, Unknown=0, NotChecked=0, Total=22350 [2023-04-02 14:59:05,355 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 139 states, 139 states have (on average 1.1654676258992807) internal successors, (162), 137 states have internal predecessors, (162), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:21,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:59:21,644 INFO L93 Difference]: Finished difference Result 197 states and 237 transitions. [2023-04-02 14:59:21,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2023-04-02 14:59:21,645 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.1654676258992807) internal successors, (162), 137 states have internal predecessors, (162), 2 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 65 [2023-04-02 14:59:21,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:59:21,647 INFO L225 Difference]: With dead ends: 197 [2023-04-02 14:59:21,647 INFO L226 Difference]: Without dead ends: 191 [2023-04-02 14:59:21,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 100 SyntacticMatches, 5 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10732 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=1516, Invalid=44066, Unknown=0, NotChecked=0, Total=45582 [2023-04-02 14:59:21,650 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 72 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 14764 mSolverCounterSat, 932 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 540 SdHoareTripleChecker+Invalid, 15696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 932 IncrementalHoareTripleChecker+Valid, 14764 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2023-04-02 14:59:21,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 540 Invalid, 15696 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [932 Valid, 14764 Invalid, 0 Unknown, 0 Unchecked, 7.5s Time] [2023-04-02 14:59:21,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2023-04-02 14:59:21,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 115. [2023-04-02 14:59:21,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.209090909090909) internal successors, (133), 110 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:21,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 137 transitions. [2023-04-02 14:59:21,696 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 137 transitions. Word has length 65 [2023-04-02 14:59:21,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:59:21,696 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 137 transitions. [2023-04-02 14:59:21,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 1.1654676258992807) internal successors, (162), 137 states have internal predecessors, (162), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:21,696 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 137 transitions. [2023-04-02 14:59:21,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-04-02 14:59:21,697 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:59:21,697 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:59:21,702 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 14:59:21,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:59:21,898 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:59:21,898 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:59:21,898 INFO L85 PathProgramCache]: Analyzing trace with hash -1774857866, now seen corresponding path program 10 times [2023-04-02 14:59:21,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:59:21,899 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223313899] [2023-04-02 14:59:21,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:59:21,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:59:21,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:59:22,049 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-04-02 14:59:22,049 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:59:22,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223313899] [2023-04-02 14:59:22,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223313899] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:59:22,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459677522] [2023-04-02 14:59:22,050 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:59:22,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:59:22,050 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:59:22,051 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:59:22,065 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 14:59:22,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:59:22,158 INFO L262 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 14:59:22,160 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:59:22,246 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-04-02 14:59:22,246 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:59:22,315 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-04-02 14:59:22,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459677522] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:59:22,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [720628750] [2023-04-02 14:59:22,317 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:59:22,317 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:59:22,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:59:22,317 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:59:22,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:59:22,335 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:59:22,586 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:59:22,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:59:22,592 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:59:22,954 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7368#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:59:22,955 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:59:22,955 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:59:22,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-02 14:59:22,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973896969] [2023-04-02 14:59:22,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:59:22,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 14:59:22,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:59:22,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 14:59:22,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2023-04-02 14:59:22,956 INFO L87 Difference]: Start difference. First operand 115 states and 137 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:23,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:59:23,254 INFO L93 Difference]: Finished difference Result 228 states and 271 transitions. [2023-04-02 14:59:23,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 14:59:23,254 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 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 66 [2023-04-02 14:59:23,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:59:23,255 INFO L225 Difference]: With dead ends: 228 [2023-04-02 14:59:23,255 INFO L226 Difference]: Without dead ends: 89 [2023-04-02 14:59:23,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=189, Invalid=1071, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 14:59:23,256 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:59:23,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 33 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:59:23,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-04-02 14:59:23,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2023-04-02 14:59:23,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 84 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:23,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 104 transitions. [2023-04-02 14:59:23,300 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 104 transitions. Word has length 66 [2023-04-02 14:59:23,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:59:23,300 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 104 transitions. [2023-04-02 14:59:23,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:23,300 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 104 transitions. [2023-04-02 14:59:23,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-04-02 14:59:23,301 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:59:23,301 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:59:23,306 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 14:59:23,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 14:59:23,502 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:59:23,502 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:59:23,502 INFO L85 PathProgramCache]: Analyzing trace with hash -447316227, now seen corresponding path program 11 times [2023-04-02 14:59:23,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:59:23,503 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212385811] [2023-04-02 14:59:23,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:59:23,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:59:23,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:59:23,655 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2023-04-02 14:59:23,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:59:23,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212385811] [2023-04-02 14:59:23,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212385811] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:59:23,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533762692] [2023-04-02 14:59:23,656 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:59:23,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:59:23,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:59:23,657 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:59:23,683 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 14:59:23,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 14:59:23,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:59:23,762 INFO L262 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 14:59:23,763 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:59:23,864 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2023-04-02 14:59:23,864 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:59:23,948 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2023-04-02 14:59:23,948 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533762692] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:59:23,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [273190308] [2023-04-02 14:59:23,953 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:59:23,953 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:59:23,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:59:23,953 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:59:23,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:59:23,985 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:59:24,259 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:59:24,263 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:59:24,266 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:59:24,676 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8433#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:59:24,677 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:59:24,677 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:59:24,677 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2023-04-02 14:59:24,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149786746] [2023-04-02 14:59:24,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:59:24,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-04-02 14:59:24,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:59:24,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-04-02 14:59:24,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2023-04-02 14:59:24,679 INFO L87 Difference]: Start difference. First operand 89 states and 104 transitions. Second operand has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:25,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:59:25,010 INFO L93 Difference]: Finished difference Result 149 states and 182 transitions. [2023-04-02 14:59:25,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 14:59:25,010 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 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 67 [2023-04-02 14:59:25,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:59:25,010 INFO L225 Difference]: With dead ends: 149 [2023-04-02 14:59:25,011 INFO L226 Difference]: Without dead ends: 77 [2023-04-02 14:59:25,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 176 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=257, Invalid=1465, Unknown=0, NotChecked=0, Total=1722 [2023-04-02 14:59:25,012 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 183 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:59:25,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 78 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:59:25,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-04-02 14:59:25,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-04-02 14:59:25,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.1527777777777777) internal successors, (83), 72 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:25,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2023-04-02 14:59:25,043 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 67 [2023-04-02 14:59:25,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:59:25,043 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2023-04-02 14:59:25,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 24 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:59:25,043 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2023-04-02 14:59:25,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-04-02 14:59:25,043 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:59:25,044 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:59:25,049 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 14:59:25,245 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 14:59:25,245 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:59:25,245 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:59:25,245 INFO L85 PathProgramCache]: Analyzing trace with hash 945163635, now seen corresponding path program 12 times [2023-04-02 14:59:25,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:59:25,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70442807] [2023-04-02 14:59:25,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:59:25,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:59:25,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:59:36,681 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 7 proven. 158 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:59:36,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:59:36,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70442807] [2023-04-02 14:59:36,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70442807] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:59:36,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385166852] [2023-04-02 14:59:36,682 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:59:36,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:59:36,683 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:59:36,689 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:59:36,694 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 14:59:36,857 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:59:36,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:59:36,865 WARN L260 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 222 conjunts are in the unsatisfiable core [2023-04-02 14:59:36,870 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:59:36,910 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 [2023-04-02 14:59:41,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:59:41,226 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:59:41,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:59:41,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:59:41,229 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:59:41,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:59:41,230 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:59:41,231 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:59:41,237 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:59:41,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 6 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 117 treesize of output 37 [2023-04-02 14:59:41,471 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:59:41,472 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:59:51,141 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 14:59:51,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385166852] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:59:51,142 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [944631234] [2023-04-02 14:59:51,149 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 14:59:51,149 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:59:51,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:59:51,150 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:59:51,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:59:51,170 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:59:51,439 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:59:51,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:59:51,446 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:59:53,834 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9517#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:59:53,834 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:59:53,834 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:59:53,834 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 62, 60] total 161 [2023-04-02 14:59:53,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29967388] [2023-04-02 14:59:53,834 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:59:53,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2023-04-02 14:59:53,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:59:53,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2023-04-02 14:59:53,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=28894, Unknown=0, NotChecked=0, Total=29412 [2023-04-02 14:59:53,839 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand has 161 states, 161 states have (on average 1.1428571428571428) internal successors, (184), 159 states have internal predecessors, (184), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:16,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:00:16,858 INFO L93 Difference]: Finished difference Result 285 states and 336 transitions. [2023-04-02 15:00:16,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2023-04-02 15:00:16,858 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 1.1428571428571428) internal successors, (184), 159 states have internal predecessors, (184), 2 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 76 [2023-04-02 15:00:16,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:00:16,861 INFO L225 Difference]: With dead ends: 285 [2023-04-02 15:00:16,861 INFO L226 Difference]: Without dead ends: 279 [2023-04-02 15:00:16,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 113 SyntacticMatches, 14 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12492 ImplicationChecksByTransitivity, 31.5s TimeCoverageRelationStatistics Valid=1725, Invalid=57081, Unknown=0, NotChecked=0, Total=58806 [2023-04-02 15:00:16,864 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 79 mSDsluCounter, 616 mSDsCounter, 0 mSdLazyCounter, 15786 mSolverCounterSat, 1005 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 625 SdHoareTripleChecker+Invalid, 16791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1005 IncrementalHoareTripleChecker+Valid, 15786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2023-04-02 15:00:16,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 625 Invalid, 16791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1005 Valid, 15786 Invalid, 0 Unknown, 0 Unchecked, 9.8s Time] [2023-04-02 15:00:16,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2023-04-02 15:00:17,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 172. [2023-04-02 15:00:17,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.1796407185628743) internal successors, (197), 167 states have internal predecessors, (197), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:17,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 201 transitions. [2023-04-02 15:00:17,006 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 201 transitions. Word has length 76 [2023-04-02 15:00:17,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:00:17,007 INFO L495 AbstractCegarLoop]: Abstraction has 172 states and 201 transitions. [2023-04-02 15:00:17,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 1.1428571428571428) internal successors, (184), 159 states have internal predecessors, (184), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:17,007 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 201 transitions. [2023-04-02 15:00:17,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-04-02 15:00:17,008 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:00:17,008 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:00:17,019 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 15:00:17,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 15:00:17,215 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:00:17,215 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:00:17,215 INFO L85 PathProgramCache]: Analyzing trace with hash 1284356347, now seen corresponding path program 13 times [2023-04-02 15:00:17,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:00:17,215 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392387929] [2023-04-02 15:00:17,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:00:17,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:00:17,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:00:17,427 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2023-04-02 15:00:17,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:00:17,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392387929] [2023-04-02 15:00:17,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392387929] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:00:17,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781358206] [2023-04-02 15:00:17,428 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:00:17,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:00:17,428 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:00:17,433 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:00:17,480 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 15:00:17,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:00:17,608 INFO L262 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 15:00:17,611 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:00:17,741 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2023-04-02 15:00:17,741 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:00:17,850 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2023-04-02 15:00:17,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781358206] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:00:17,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [951304228] [2023-04-02 15:00:17,852 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 15:00:17,852 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:00:17,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:00:17,852 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:00:17,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:00:17,868 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:00:18,124 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 15:00:18,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:00:18,131 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:00:18,547 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11053#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:00:18,547 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:00:18,547 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:00:18,547 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-04-02 15:00:18,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629424102] [2023-04-02 15:00:18,547 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:00:18,548 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 15:00:18,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:00:18,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 15:00:18,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=960, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 15:00:18,549 INFO L87 Difference]: Start difference. First operand 172 states and 201 transitions. Second operand has 23 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:19,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:00:19,079 INFO L93 Difference]: Finished difference Result 281 states and 326 transitions. [2023-04-02 15:00:19,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 15:00:19,080 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 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 77 [2023-04-02 15:00:19,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:00:19,080 INFO L225 Difference]: With dead ends: 281 [2023-04-02 15:00:19,080 INFO L226 Difference]: Without dead ends: 129 [2023-04-02 15:00:19,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 202 SyntacticMatches, 11 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=239, Invalid=1321, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 15:00:19,081 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:00:19,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 41 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 15:00:19,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-04-02 15:00:19,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2023-04-02 15:00:19,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.1693548387096775) internal successors, (145), 124 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:19,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 149 transitions. [2023-04-02 15:00:19,188 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 149 transitions. Word has length 77 [2023-04-02 15:00:19,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:00:19,188 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 149 transitions. [2023-04-02 15:00:19,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:19,189 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 149 transitions. [2023-04-02 15:00:19,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-04-02 15:00:19,189 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:00:19,189 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:00:19,195 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 15:00:19,394 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-02 15:00:19,395 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:00:19,395 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:00:19,395 INFO L85 PathProgramCache]: Analyzing trace with hash 1692213524, now seen corresponding path program 14 times [2023-04-02 15:00:19,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:00:19,395 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159536313] [2023-04-02 15:00:19,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:00:19,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:00:19,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:00:19,595 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2023-04-02 15:00:19,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:00:19,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159536313] [2023-04-02 15:00:19,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159536313] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:00:19,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387952265] [2023-04-02 15:00:19,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:00:19,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:00:19,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:00:19,599 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:00:19,622 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 15:00:19,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 15:00:19,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:00:19,731 INFO L262 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 15:00:19,733 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:00:19,907 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2023-04-02 15:00:19,907 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:00:20,064 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2023-04-02 15:00:20,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387952265] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:00:20,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [414374251] [2023-04-02 15:00:20,065 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 15:00:20,065 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:00:20,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:00:20,066 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:00:20,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:00:20,105 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:00:20,387 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 15:00:20,391 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:00:20,394 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:00:20,848 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12376#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:00:20,848 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:00:20,849 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:00:20,849 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2023-04-02 15:00:20,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785850622] [2023-04-02 15:00:20,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:00:20,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-04-02 15:00:20,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:00:20,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-04-02 15:00:20,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1296, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 15:00:20,851 INFO L87 Difference]: Start difference. First operand 129 states and 149 transitions. Second operand has 28 states, 28 states have (on average 2.642857142857143) internal successors, (74), 28 states have internal predecessors, (74), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:21,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:00:21,261 INFO L93 Difference]: Finished difference Result 192 states and 229 transitions. [2023-04-02 15:00:21,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 15:00:21,261 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.642857142857143) internal successors, (74), 28 states have internal predecessors, (74), 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 78 [2023-04-02 15:00:21,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:00:21,262 INFO L225 Difference]: With dead ends: 192 [2023-04-02 15:00:21,262 INFO L226 Difference]: Without dead ends: 88 [2023-04-02 15:00:21,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 206 SyntacticMatches, 12 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=328, Invalid=1834, Unknown=0, NotChecked=0, Total=2162 [2023-04-02 15:00:21,263 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 181 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 529 mSolverCounterSat, 361 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 361 IncrementalHoareTripleChecker+Valid, 529 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 15:00:21,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 88 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [361 Valid, 529 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 15:00:21,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-04-02 15:00:21,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2023-04-02 15:00:21,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.1325301204819278) internal successors, (94), 83 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:21,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 98 transitions. [2023-04-02 15:00:21,317 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 98 transitions. Word has length 78 [2023-04-02 15:00:21,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:00:21,318 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 98 transitions. [2023-04-02 15:00:21,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.642857142857143) internal successors, (74), 28 states have internal predecessors, (74), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:00:21,318 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 98 transitions. [2023-04-02 15:00:21,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-04-02 15:00:21,318 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:00:21,319 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:00:21,324 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 15:00:21,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:00:21,522 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:00:21,522 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:00:21,522 INFO L85 PathProgramCache]: Analyzing trace with hash 1253721676, now seen corresponding path program 15 times [2023-04-02 15:00:21,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:00:21,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878018941] [2023-04-02 15:00:21,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:00:21,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:00:22,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:00:35,078 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 19 proven. 212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:00:35,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:00:35,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878018941] [2023-04-02 15:00:35,078 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878018941] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:00:35,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922791240] [2023-04-02 15:00:35,078 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:00:35,078 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:00:35,079 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:00:35,080 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:00:35,081 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 15:00:35,206 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:00:35,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:00:35,211 WARN L260 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 266 conjunts are in the unsatisfiable core [2023-04-02 15:00:35,216 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:00:35,410 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 [2023-04-02 15:00:42,729 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:00:42,730 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:00:56,295 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 15:00:56,296 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922791240] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:00:56,296 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2085445923] [2023-04-02 15:00:56,297 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 15:00:56,297 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:00:56,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:00:56,297 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:00:56,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:00:56,309 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:00:56,618 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 15:00:56,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:00:56,633 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:00:59,419 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13677#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:00:59,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:00:59,419 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:00:59,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 73, 70] total 201 [2023-04-02 15:00:59,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073743542] [2023-04-02 15:00:59,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:00:59,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 201 states [2023-04-02 15:00:59,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:00:59,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 201 interpolants. [2023-04-02 15:00:59,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=737, Invalid=43995, Unknown=0, NotChecked=0, Total=44732 [2023-04-02 15:00:59,424 INFO L87 Difference]: Start difference. First operand 88 states and 98 transitions. Second operand has 201 states, 201 states have (on average 1.1144278606965174) internal successors, (224), 199 states have internal predecessors, (224), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:27,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:01:27,025 INFO L93 Difference]: Finished difference Result 187 states and 215 transitions. [2023-04-02 15:01:27,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2023-04-02 15:01:27,026 INFO L78 Accepts]: Start accepts. Automaton has has 201 states, 201 states have (on average 1.1144278606965174) internal successors, (224), 199 states have internal predecessors, (224), 2 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 87 [2023-04-02 15:01:27,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:01:27,026 INFO L225 Difference]: With dead ends: 187 [2023-04-02 15:01:27,026 INFO L226 Difference]: Without dead ends: 182 [2023-04-02 15:01:27,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 126 SyntacticMatches, 5 SemanticMatches, 286 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20100 ImplicationChecksByTransitivity, 43.1s TimeCoverageRelationStatistics Valid=2211, Invalid=80445, Unknown=0, NotChecked=0, Total=82656 [2023-04-02 15:01:27,030 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 21 mSDsluCounter, 746 mSDsCounter, 0 mSdLazyCounter, 18979 mSolverCounterSat, 786 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 755 SdHoareTripleChecker+Invalid, 19765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 786 IncrementalHoareTripleChecker+Valid, 18979 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2023-04-02 15:01:27,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 755 Invalid, 19765 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [786 Valid, 18979 Invalid, 0 Unknown, 0 Unchecked, 10.9s Time] [2023-04-02 15:01:27,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2023-04-02 15:01:27,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 118. [2023-04-02 15:01:27,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.1415929203539823) internal successors, (129), 113 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:27,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 133 transitions. [2023-04-02 15:01:27,130 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 133 transitions. Word has length 87 [2023-04-02 15:01:27,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:01:27,130 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 133 transitions. [2023-04-02 15:01:27,130 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 201 states, 201 states have (on average 1.1144278606965174) internal successors, (224), 199 states have internal predecessors, (224), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:27,130 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 133 transitions. [2023-04-02 15:01:27,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-04-02 15:01:27,131 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:01:27,131 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:01:27,137 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-04-02 15:01:27,337 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-04-02 15:01:27,337 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:01:27,338 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:01:27,338 INFO L85 PathProgramCache]: Analyzing trace with hash 371483414, now seen corresponding path program 16 times [2023-04-02 15:01:27,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:01:27,338 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512287479] [2023-04-02 15:01:27,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:01:27,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:01:27,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:01:27,584 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2023-04-02 15:01:27,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:01:27,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512287479] [2023-04-02 15:01:27,585 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512287479] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:01:27,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328658271] [2023-04-02 15:01:27,585 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:01:27,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:01:27,586 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:01:27,587 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:01:27,590 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 15:01:27,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:01:27,712 INFO L262 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 15:01:27,713 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:01:27,883 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2023-04-02 15:01:27,884 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:01:28,016 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2023-04-02 15:01:28,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1328658271] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:01:28,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1009883039] [2023-04-02 15:01:28,017 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 15:01:28,017 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:01:28,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:01:28,018 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:01:28,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:01:28,034 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:01:28,344 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 15:01:28,363 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:01:28,368 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:01:28,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14988#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:01:28,794 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:01:28,795 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:01:28,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2023-04-02 15:01:28,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166702107] [2023-04-02 15:01:28,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:01:28,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-02 15:01:28,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:01:28,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-02 15:01:28,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 15:01:28,796 INFO L87 Difference]: Start difference. First operand 118 states and 133 transitions. Second operand has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:29,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:01:29,288 INFO L93 Difference]: Finished difference Result 288 states and 327 transitions. [2023-04-02 15:01:29,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-02 15:01:29,289 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 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 88 [2023-04-02 15:01:29,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:01:29,289 INFO L225 Difference]: With dead ends: 288 [2023-04-02 15:01:29,290 INFO L226 Difference]: Without dead ends: 119 [2023-04-02 15:01:29,290 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 232 SyntacticMatches, 13 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 711 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=296, Invalid=1596, Unknown=0, NotChecked=0, Total=1892 [2023-04-02 15:01:29,291 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 32 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:01:29,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 45 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:01:29,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-04-02 15:01:29,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2023-04-02 15:01:29,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.1403508771929824) internal successors, (130), 114 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:29,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 134 transitions. [2023-04-02 15:01:29,388 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 134 transitions. Word has length 88 [2023-04-02 15:01:29,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:01:29,388 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 134 transitions. [2023-04-02 15:01:29,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:29,389 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 134 transitions. [2023-04-02 15:01:29,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-04-02 15:01:29,389 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:01:29,390 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:01:29,396 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-04-02 15:01:29,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-04-02 15:01:29,596 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:01:29,596 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:01:29,596 INFO L85 PathProgramCache]: Analyzing trace with hash -235069091, now seen corresponding path program 17 times [2023-04-02 15:01:29,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:01:29,596 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1456526808] [2023-04-02 15:01:29,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:01:29,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:01:29,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:01:29,825 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2023-04-02 15:01:29,825 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:01:29,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1456526808] [2023-04-02 15:01:29,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1456526808] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:01:29,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836830117] [2023-04-02 15:01:29,825 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:01:29,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:01:29,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:01:29,826 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:01:29,828 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-04-02 15:01:29,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 15:01:29,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:01:29,958 INFO L262 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 15:01:29,960 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:01:30,136 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2023-04-02 15:01:30,136 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:01:30,282 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2023-04-02 15:01:30,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836830117] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:01:30,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1456913279] [2023-04-02 15:01:30,304 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 15:01:30,305 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:01:30,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:01:30,305 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:01:30,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:01:30,322 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 15:01:30,603 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 15:01:30,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 15:01:30,611 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:01:31,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16371#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:01:31,040 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:01:31,040 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:01:31,040 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2023-04-02 15:01:31,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838331371] [2023-04-02 15:01:31,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:01:31,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-02 15:01:31,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:01:31,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-02 15:01:31,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1133, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 15:01:31,042 INFO L87 Difference]: Start difference. First operand 119 states and 134 transitions. Second operand has 26 states, 26 states have (on average 2.730769230769231) internal successors, (71), 26 states have internal predecessors, (71), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:31,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:01:31,404 INFO L93 Difference]: Finished difference Result 197 states and 230 transitions. [2023-04-02 15:01:31,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-02 15:01:31,405 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.730769230769231) internal successors, (71), 26 states have internal predecessors, (71), 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 89 [2023-04-02 15:01:31,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:01:31,405 INFO L225 Difference]: With dead ends: 197 [2023-04-02 15:01:31,405 INFO L226 Difference]: Without dead ends: 99 [2023-04-02 15:01:31,406 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 234 SyntacticMatches, 14 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 828 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=364, Invalid=1616, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 15:01:31,406 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 283 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:01:31,407 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 54 Invalid, 426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:01:31,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-04-02 15:01:31,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-04-02 15:01:31,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.1170212765957446) internal successors, (105), 94 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:31,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 109 transitions. [2023-04-02 15:01:31,492 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 109 transitions. Word has length 89 [2023-04-02 15:01:31,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:01:31,492 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 109 transitions. [2023-04-02 15:01:31,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.730769230769231) internal successors, (71), 26 states have internal predecessors, (71), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:01:31,492 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 109 transitions. [2023-04-02 15:01:31,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-04-02 15:01:31,493 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:01:31,493 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:01:31,498 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-04-02 15:01:31,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:01:31,694 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:01:31,694 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:01:31,694 INFO L85 PathProgramCache]: Analyzing trace with hash -757454573, now seen corresponding path program 18 times [2023-04-02 15:01:31,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:01:31,694 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417460703] [2023-04-02 15:01:31,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:01:31,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:01:32,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:01:48,716 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 48 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:01:48,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:01:48,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417460703] [2023-04-02 15:01:48,717 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417460703] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:01:48,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448158738] [2023-04-02 15:01:48,717 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:01:48,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:01:48,717 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:01:48,718 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:01:48,720 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-04-02 15:01:48,864 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:01:48,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:01:48,868 WARN L260 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 306 conjunts are in the unsatisfiable core [2023-04-02 15:01:48,872 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:01:49,116 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 [2023-04-02 15:01:54,697 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 15:01:54,699 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 15:01:54,699 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 31 treesize of output 14 [2023-04-02 15:01:54,969 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:01:54,969 INFO L327 TraceCheckSpWp]: Computing backward predicates...