/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 EqDomain -i ../sv-benchmarks/c/array-crafted/zero_sum_m3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 08:56:43,713 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 08:56:43,715 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 08:56:43,754 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 08:56:43,755 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 08:56:43,757 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 08:56:43,760 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 08:56:43,762 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 08:56:43,764 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 08:56:43,768 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 08:56:43,770 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 08:56:43,771 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 08:56:43,772 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 08:56:43,774 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 08:56:43,775 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 08:56:43,777 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 08:56:43,778 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 08:56:43,778 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 08:56:43,780 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 08:56:43,784 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 08:56:43,785 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 08:56:43,786 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 08:56:43,787 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 08:56:43,788 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 08:56:43,792 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 08:56:43,792 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 08:56:43,792 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 08:56:43,792 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 08:56:43,793 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 08:56:43,794 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 08:56:43,794 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 08:56:43,795 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 08:56:43,796 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 08:56:43,797 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 08:56:43,797 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 08:56:43,797 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 08:56:43,798 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 08:56:43,798 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 08:56:43,798 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 08:56:43,799 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 08:56:43,799 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 08:56:43,800 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 08:56:43,828 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 08:56:43,828 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 08:56:43,829 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 08:56:43,829 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 08:56:43,830 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 08:56:43,830 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 08:56:43,830 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 08:56:43,830 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 08:56:43,830 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 08:56:43,830 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 08:56:43,831 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 08:56:43,831 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 08:56:43,831 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 08:56:43,831 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 08:56:43,832 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 08:56:43,832 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 08:56:43,832 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 08:56:43,832 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 08:56:43,832 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 08:56:43,833 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 08:56:43,833 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 08:56:43,833 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 08:56:43,833 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 08:56:43,833 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 08:56:43,833 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 08:56:43,834 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 08:56:43,834 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 08:56:43,834 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 08:56:43,834 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 08:56:43,834 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 08:56:43,835 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 08:56:43,835 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 08:56:43,835 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:56:43,835 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 08:56:43,835 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 08:56:43,835 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 08:56:43,835 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 08:56:43,835 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 08:56:43,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 08:56:43,836 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 08:56:43,836 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 08:56:43,836 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 08:56:44,081 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 08:56:44,101 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 08:56:44,103 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 08:56:44,104 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 08:56:44,105 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 08:56:44,106 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum_m3.c [2023-04-01 08:56:45,224 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 08:56:45,421 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 08:56:45,422 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_m3.c [2023-04-01 08:56:45,428 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f27f9570/589aa0be6d3c42fda5284a0491d579b2/FLAG345e2bbee [2023-04-01 08:56:45,442 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f27f9570/589aa0be6d3c42fda5284a0491d579b2 [2023-04-01 08:56:45,444 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 08:56:45,445 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 08:56:45,448 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 08:56:45,448 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 08:56:45,451 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 08:56:45,452 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,453 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61c9b987 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45, skipping insertion in model container [2023-04-01 08:56:45,453 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,459 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 08:56:45,472 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 08:56:45,611 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_m3.c[402,415] [2023-04-01 08:56:45,634 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:56:45,641 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 08:56:45,650 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_m3.c[402,415] [2023-04-01 08:56:45,663 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:56:45,673 INFO L208 MainTranslator]: Completed translation [2023-04-01 08:56:45,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45 WrapperNode [2023-04-01 08:56:45,673 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 08:56:45,674 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 08:56:45,674 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 08:56:45,674 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 08:56:45,682 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,688 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,694 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,698 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,699 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,700 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,702 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 08:56:45,703 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 08:56:45,703 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 08:56:45,703 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 08:56:45,703 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (1/1) ... [2023-04-01 08:56:45,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:56:45,717 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:45,734 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 08:56:45,752 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 08:56:45,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 08:56:45,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 08:56:45,774 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 08:56:45,774 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 08:56:45,774 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 08:56:45,775 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 08:56:45,775 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 08:56:45,775 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 08:56:45,775 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 08:56:45,775 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 08:56:45,775 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 08:56:45,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 08:56:45,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2023-04-01 08:56:45,776 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 08:56:45,776 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 08:56:45,776 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 08:56:45,776 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 08:56:45,776 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 08:56:45,776 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 08:56:45,776 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 08:56:45,776 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 08:56:45,838 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 08:56:45,840 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 08:56:45,994 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 08:56:46,049 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 08:56:46,049 INFO L302 CfgBuilder]: Removed 7 assume(true) statements. [2023-04-01 08:56:46,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:56:46 BoogieIcfgContainer [2023-04-01 08:56:46,051 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 08:56:46,053 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 08:56:46,054 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 08:56:46,056 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 08:56:46,056 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 08:56:45" (1/3) ... [2023-04-01 08:56:46,057 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@458db56f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:56:46, skipping insertion in model container [2023-04-01 08:56:46,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:45" (2/3) ... [2023-04-01 08:56:46,057 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@458db56f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:56:46, skipping insertion in model container [2023-04-01 08:56:46,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:56:46" (3/3) ... [2023-04-01 08:56:46,059 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m3.c [2023-04-01 08:56:46,074 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 08:56:46,074 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 08:56:46,122 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 08:56:46,127 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;@2154aaf4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 08:56:46,127 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 08:56:46,131 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.588235294117647) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:56:46,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 08:56:46,137 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:46,138 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:46,138 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:46,142 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:46,143 INFO L85 PathProgramCache]: Analyzing trace with hash -54699181, now seen corresponding path program 1 times [2023-04-01 08:56:46,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:46,151 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526612872] [2023-04-01 08:56:46,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:46,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:46,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:46,378 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:46,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:46,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526612872] [2023-04-01 08:56:46,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526612872] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:56:46,380 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:56:46,380 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 08:56:46,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940604553] [2023-04-01 08:56:46,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:56:46,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:56:46,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:46,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:56:46,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:56:46,441 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.588235294117647) internal successors, (27), 18 states have internal predecessors, (27), 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 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:46,544 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2023-04-01 08:56:46,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:56:46,547 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2023-04-01 08:56:46,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:46,552 INFO L225 Difference]: With dead ends: 44 [2023-04-01 08:56:46,552 INFO L226 Difference]: Without dead ends: 19 [2023-04-01 08:56:46,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:56:46,558 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:46,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:46,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-04-01 08:56:46,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-04-01 08:56:46,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2023-04-01 08:56:46,614 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 17 [2023-04-01 08:56:46,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:46,616 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2023-04-01 08:56:46,616 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,617 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2023-04-01 08:56:46,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 08:56:46,618 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:46,618 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:46,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 08:56:46,618 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:46,619 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:46,619 INFO L85 PathProgramCache]: Analyzing trace with hash -1205809628, now seen corresponding path program 1 times [2023-04-01 08:56:46,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:46,620 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479641636] [2023-04-01 08:56:46,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:46,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:46,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:46,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 08:56:46,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:46,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479641636] [2023-04-01 08:56:46,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479641636] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:56:46,744 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:56:46,744 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 08:56:46,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926475055] [2023-04-01 08:56:46,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:56:46,746 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 08:56:46,746 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:46,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 08:56:46,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 08:56:46,747 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:46,797 INFO L93 Difference]: Finished difference Result 35 states and 51 transitions. [2023-04-01 08:56:46,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 08:56:46,798 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 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 18 [2023-04-01 08:56:46,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:46,799 INFO L225 Difference]: With dead ends: 35 [2023-04-01 08:56:46,799 INFO L226 Difference]: Without dead ends: 25 [2023-04-01 08:56:46,799 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 [2023-04-01 08:56:46,800 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:46,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:46,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-04-01 08:56:46,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-04-01 08:56:46,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2023-04-01 08:56:46,807 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 18 [2023-04-01 08:56:46,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:46,808 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2023-04-01 08:56:46,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,808 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2023-04-01 08:56:46,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 08:56:46,809 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:46,809 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:46,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 08:56:46,809 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:46,810 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:46,810 INFO L85 PathProgramCache]: Analyzing trace with hash 876405612, now seen corresponding path program 1 times [2023-04-01 08:56:46,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:46,810 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908779173] [2023-04-01 08:56:46,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:46,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:46,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:46,980 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:46,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:46,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908779173] [2023-04-01 08:56:46,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908779173] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:46,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850003244] [2023-04-01 08:56:46,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:46,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:46,982 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:46,984 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:46,991 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 08:56:47,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:47,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:56:47,087 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:47,172 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:47,172 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:47,212 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:47,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850003244] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:47,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2012768797] [2023-04-01 08:56:47,266 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:47,267 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:47,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:47,278 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:47,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:47,465 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:48,831 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:48,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:48,878 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:49,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '389#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_1| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_1| Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_1| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_1| |v_old(#length)_BEFORE_CALL_1|)) (= (select |v_old(#length)_BEFORE_CALL_1| 3) 12) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#valid)_BEFORE_CALL_1|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_1| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_1| 2) 14) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_1|)) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_1| |v_main_~#a~0.base_BEFORE_CALL_1|) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_1|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_1|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:49,628 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:49,628 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:49,628 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 08:56:49,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950727182] [2023-04-01 08:56:49,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:49,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 08:56:49,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:49,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 08:56:49,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:56:49,630 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:49,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:49,666 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2023-04-01 08:56:49,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 08:56:49,667 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-04-01 08:56:49,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:49,667 INFO L225 Difference]: With dead ends: 43 [2023-04-01 08:56:49,667 INFO L226 Difference]: Without dead ends: 26 [2023-04-01 08:56:49,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:56:49,669 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:49,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:49,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-01 08:56:49,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-04-01 08:56:49,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:49,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2023-04-01 08:56:49,686 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 24 [2023-04-01 08:56:49,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:49,686 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2023-04-01 08:56:49,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:49,687 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2023-04-01 08:56:49,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 08:56:49,688 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:49,688 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] [2023-04-01 08:56:49,696 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 08:56:49,894 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 [2023-04-01 08:56:49,894 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:49,894 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:49,895 INFO L85 PathProgramCache]: Analyzing trace with hash -2008362117, now seen corresponding path program 2 times [2023-04-01 08:56:49,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:49,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817580463] [2023-04-01 08:56:49,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:49,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:49,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:50,047 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:56:50,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:50,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817580463] [2023-04-01 08:56:50,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817580463] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:50,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738770604] [2023-04-01 08:56:50,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:50,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:50,052 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:50,054 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:50,056 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 08:56:50,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 08:56:50,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:50,116 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:56:50,118 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:50,155 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:56:50,155 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:50,190 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:56:50,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [738770604] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:50,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [964397958] [2023-04-01 08:56:50,194 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:50,194 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:50,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:50,195 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:50,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:50,248 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:50,989 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:51,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:51,029 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:51,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '680#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_2| Int) (|v_old(#valid)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_2| (Array Int (Array Int Int)))) (and (= 2 (select |v_old(#length)_BEFORE_CALL_2| 1)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#length)_BEFORE_CALL_2| 3) 12) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 1) 0) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_2|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 0) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 0)) (not (= |v_old(#length)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (= (select |v_old(#length)_BEFORE_CALL_2| 2) 14) (not (= |v_old(#valid)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| |v_old(#length)_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_2| |v_main_~#a~0.base_BEFORE_CALL_2|) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_2| 1) 1))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:51,700 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:51,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:51,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-04-01 08:56:51,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139446362] [2023-04-01 08:56:51,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:51,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 08:56:51,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:51,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 08:56:51,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-04-01 08:56:51,703 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:51,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:51,752 INFO L93 Difference]: Finished difference Result 47 states and 63 transitions. [2023-04-01 08:56:51,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 08:56:51,753 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-04-01 08:56:51,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:51,753 INFO L225 Difference]: With dead ends: 47 [2023-04-01 08:56:51,753 INFO L226 Difference]: Without dead ends: 32 [2023-04-01 08:56:51,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-04-01 08:56:51,755 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:51,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 18 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:51,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-01 08:56:51,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-01 08:56:51,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:51,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2023-04-01 08:56:51,760 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 25 [2023-04-01 08:56:51,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:51,760 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2023-04-01 08:56:51,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:51,760 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2023-04-01 08:56:51,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-01 08:56:51,761 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:51,761 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:51,768 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:51,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-04-01 08:56:51,962 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:51,962 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:51,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1517129357, now seen corresponding path program 3 times [2023-04-01 08:56:51,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:51,962 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587549108] [2023-04-01 08:56:51,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:51,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:52,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:53,895 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:53,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:53,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587549108] [2023-04-01 08:56:53,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587549108] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:53,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049854607] [2023-04-01 08:56:53,896 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:53,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:53,896 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:53,897 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:53,900 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 08:56:53,969 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:53,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:53,971 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 64 conjunts are in the unsatisfiable core [2023-04-01 08:56:53,974 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:54,016 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 [2023-04-01 08:56:54,356 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:54,358 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:56:54,358 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 [2023-04-01 08:56:54,431 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:54,431 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:55,088 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 08:56:55,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2049854607] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:55,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1144322642] [2023-04-01 08:56:55,090 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:55,090 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:55,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:55,091 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:55,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:55,136 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:55,811 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:55,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:55,844 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:56,792 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1057#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int) (|v_old(#length)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_3| (Array Int (Array Int Int)))) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 0) 48) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select |v_old(#length)_BEFORE_CALL_3| 2) 14) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_3| 0) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_3|)) (not (= |v_old(#valid)_BEFORE_CALL_3| |v_old(#length)_BEFORE_CALL_3|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= 2 (select |v_old(#length)_BEFORE_CALL_3| 1)) (= (select |v_old(#length)_BEFORE_CALL_3| 3) 12) (not (= |v_old(#length)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) (not (= |v_old(#valid)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 3) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_3|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:56,793 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:56,793 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:56,793 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 20] total 38 [2023-04-01 08:56:56,793 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282689327] [2023-04-01 08:56:56,793 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:56,794 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-04-01 08:56:56,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:56,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-04-01 08:56:56,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2217, Unknown=0, NotChecked=0, Total=2352 [2023-04-01 08:56:56,796 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 36 states have internal predecessors, (49), 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) [2023-04-01 08:56:57,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:57,268 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2023-04-01 08:56:57,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-01 08:56:57,269 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 36 states have internal predecessors, (49), 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 31 [2023-04-01 08:56:57,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:57,269 INFO L225 Difference]: With dead ends: 53 [2023-04-01 08:56:57,270 INFO L226 Difference]: Without dead ends: 48 [2023-04-01 08:56:57,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 56 SyntacticMatches, 14 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=141, Invalid=2309, Unknown=0, NotChecked=0, Total=2450 [2023-04-01 08:56:57,271 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:57,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 166 Invalid, 819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 818 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 08:56:57,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-04-01 08:56:57,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2023-04-01 08:56:57,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 41 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:57,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2023-04-01 08:56:57,279 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 31 [2023-04-01 08:56:57,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:57,279 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2023-04-01 08:56:57,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 36 states have internal predecessors, (49), 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) [2023-04-01 08:56:57,280 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2023-04-01 08:56:57,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-01 08:56:57,280 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:57,281 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:57,292 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:57,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:57,489 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:57,489 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:57,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1421216939, now seen corresponding path program 4 times [2023-04-01 08:56:57,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:57,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224398739] [2023-04-01 08:56:57,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:57,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:57,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:57,580 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:56:57,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:57,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224398739] [2023-04-01 08:56:57,581 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224398739] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:57,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64524307] [2023-04-01 08:56:57,581 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:56:57,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:57,581 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:57,582 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:57,585 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 08:56:57,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:57,645 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:56:57,646 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:57,687 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:56:57,687 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:57,718 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:56:57,718 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64524307] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:57,718 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1375441302] [2023-04-01 08:56:57,719 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:57,720 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:57,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:57,720 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:57,720 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:57,756 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:58,391 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:58,414 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:58,417 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:59,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1457#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_4| Int) (|v_old(#memory_int)_BEFORE_CALL_4| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_4| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_4| (Array Int Int))) (and (= (select |v_old(#length)_BEFORE_CALL_4| 1) 2) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_4|)) (= (select |v_old(#length)_BEFORE_CALL_4| 2) 14) (= (select |v_old(#valid)_BEFORE_CALL_4| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_4| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_4| |v_old(#length)_BEFORE_CALL_4|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_4| 1) |v_old(#length)_BEFORE_CALL_4|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 1) 0) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_4|)) (= (select |v_old(#valid)_BEFORE_CALL_4| |v_main_~#a~0.base_BEFORE_CALL_4|) 0) (= (select |v_old(#valid)_BEFORE_CALL_4| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_4| 3) 12) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |v_old(#valid)_BEFORE_CALL_4| (select |v_old(#memory_int)_BEFORE_CALL_4| 1))) (= (select |v_old(#valid)_BEFORE_CALL_4| 2) 1) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:59,042 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:59,042 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:59,042 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-04-01 08:56:59,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654904629] [2023-04-01 08:56:59,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:59,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 08:56:59,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:59,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 08:56:59,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=476, Unknown=0, NotChecked=0, Total=552 [2023-04-01 08:56:59,044 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:59,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:59,181 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2023-04-01 08:56:59,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 08:56:59,182 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 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 [2023-04-01 08:56:59,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:59,182 INFO L225 Difference]: With dead ends: 86 [2023-04-01 08:56:59,182 INFO L226 Difference]: Without dead ends: 47 [2023-04-01 08:56:59,183 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2023-04-01 08:56:59,184 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:59,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 41 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:59,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-04-01 08:56:59,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-04-01 08:56:59,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:59,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 58 transitions. [2023-04-01 08:56:59,198 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 58 transitions. Word has length 32 [2023-04-01 08:56:59,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:59,199 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 58 transitions. [2023-04-01 08:56:59,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:59,199 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 58 transitions. [2023-04-01 08:56:59,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-01 08:56:59,200 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:59,200 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:59,205 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:59,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:59,401 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:59,401 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:59,401 INFO L85 PathProgramCache]: Analyzing trace with hash 601259450, now seen corresponding path program 5 times [2023-04-01 08:56:59,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:59,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549098653] [2023-04-01 08:56:59,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:59,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:59,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:59,506 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:59,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:59,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549098653] [2023-04-01 08:56:59,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549098653] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:59,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859184525] [2023-04-01 08:56:59,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:59,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:59,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:59,508 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:59,521 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 08:56:59,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:56:59,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:59,574 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:56:59,577 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:59,626 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:59,626 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:59,680 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:59,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859184525] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:59,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1034490886] [2023-04-01 08:56:59,683 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:59,683 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:59,684 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:59,684 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:59,684 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:59,713 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:00,312 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:00,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:00,340 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:00,916 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1936#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_5| Int) (|v_old(#memory_int)_BEFORE_CALL_5| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_5| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_5| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_5| (select |v_old(#memory_int)_BEFORE_CALL_5| 1))) (= (select |v_old(#valid)_BEFORE_CALL_5| 1) 1) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= 14 (select |v_old(#length)_BEFORE_CALL_5| 2)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= (select |v_old(#length)_BEFORE_CALL_5| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_5| 2) 1) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 1) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| |v_main_~#a~0.base_BEFORE_CALL_5|) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_5| 1) |v_old(#length)_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_5| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_5| |v_old(#length)_BEFORE_CALL_5|)) (= 2 (select |v_old(#length)_BEFORE_CALL_5| 1)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_5|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:00,916 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:00,916 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:00,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-01 08:57:00,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888145348] [2023-04-01 08:57:00,917 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:00,917 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 08:57:00,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:00,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 08:57:00,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=519, Unknown=0, NotChecked=0, Total=600 [2023-04-01 08:57:00,918 INFO L87 Difference]: Start difference. First operand 47 states and 58 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:01,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:01,045 INFO L93 Difference]: Finished difference Result 70 states and 90 transitions. [2023-04-01 08:57:01,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 08:57:01,046 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 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 [2023-04-01 08:57:01,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:01,046 INFO L225 Difference]: With dead ends: 70 [2023-04-01 08:57:01,047 INFO L226 Difference]: Without dead ends: 39 [2023-04-01 08:57:01,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 78 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2023-04-01 08:57:01,048 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 76 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:01,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 60 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:01,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-04-01 08:57:01,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-04-01 08:57:01,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:01,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2023-04-01 08:57:01,053 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 33 [2023-04-01 08:57:01,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:01,054 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2023-04-01 08:57:01,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:01,054 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2023-04-01 08:57:01,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-01 08:57:01,055 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:01,055 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:01,061 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-01 08:57:01,261 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 [2023-04-01 08:57:01,261 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:01,261 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:01,261 INFO L85 PathProgramCache]: Analyzing trace with hash -1520925364, now seen corresponding path program 6 times [2023-04-01 08:57:01,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:01,262 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884419823] [2023-04-01 08:57:01,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:01,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:01,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:03,875 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:03,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:03,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884419823] [2023-04-01 08:57:03,876 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884419823] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:03,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024508729] [2023-04-01 08:57:03,876 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:57:03,876 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:03,876 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:03,881 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:03,887 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 08:57:03,946 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:57:03,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:03,948 INFO L262 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 90 conjunts are in the unsatisfiable core [2023-04-01 08:57:03,951 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:03,981 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 [2023-04-01 08:57:04,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 08:57:04,822 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:57:04,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 08:57:04,824 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:57:04,827 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:57:04,828 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 [2023-04-01 08:57:04,932 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:04,932 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:06,223 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:57:06,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024508729] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:06,224 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1658085595] [2023-04-01 08:57:06,225 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:06,225 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:06,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:06,225 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:06,226 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:06,261 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:06,880 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:06,905 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:06,907 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:08,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2452#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#valid)_BEFORE_CALL_6| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_6| (Array Int (Array Int Int))) (|v_main_~#a~0.base_BEFORE_CALL_6| Int) (|v_old(#length)_BEFORE_CALL_6| (Array Int Int))) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_6| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_6| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_6| |v_main_~#a~0.base_BEFORE_CALL_6|) 0) (not (= |v_old(#valid)_BEFORE_CALL_6| |v_old(#length)_BEFORE_CALL_6|)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_6|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 0) 48) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_6|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_6| 1) |v_old(#length)_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 2) 1) (= 14 (select |v_old(#length)_BEFORE_CALL_6| 2)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#length)_BEFORE_CALL_6| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_6| (select |v_old(#memory_int)_BEFORE_CALL_6| 1))) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_6| 0) 0))) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:08,077 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:08,077 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:08,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 28, 26] total 67 [2023-04-01 08:57:08,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822493597] [2023-04-01 08:57:08,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:08,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2023-04-01 08:57:08,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:08,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2023-04-01 08:57:08,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=5765, Unknown=0, NotChecked=0, Total=6006 [2023-04-01 08:57:08,080 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 67 states, 67 states have (on average 1.2238805970149254) internal successors, (82), 65 states have internal predecessors, (82), 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) [2023-04-01 08:57:10,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:10,173 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2023-04-01 08:57:10,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-01 08:57:10,173 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.2238805970149254) internal successors, (82), 65 states have internal predecessors, (82), 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 38 [2023-04-01 08:57:10,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:10,174 INFO L225 Difference]: With dead ends: 65 [2023-04-01 08:57:10,174 INFO L226 Difference]: Without dead ends: 60 [2023-04-01 08:57:10,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 60 SyntacticMatches, 9 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2281 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=366, Invalid=8190, Unknown=0, NotChecked=0, Total=8556 [2023-04-01 08:57:10,177 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 1893 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 1927 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1893 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:10,178 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 290 Invalid, 1927 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1893 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-04-01 08:57:10,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-01 08:57:10,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2023-04-01 08:57:10,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:10,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2023-04-01 08:57:10,192 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 38 [2023-04-01 08:57:10,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:10,192 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2023-04-01 08:57:10,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.2238805970149254) internal successors, (82), 65 states have internal predecessors, (82), 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) [2023-04-01 08:57:10,195 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2023-04-01 08:57:10,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 08:57:10,197 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:10,197 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:10,205 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:10,401 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 [2023-04-01 08:57:10,401 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:10,401 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:10,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1160192002, now seen corresponding path program 7 times [2023-04-01 08:57:10,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:10,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670503202] [2023-04-01 08:57:10,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:10,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:10,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:10,513 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:57:10,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:10,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670503202] [2023-04-01 08:57:10,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670503202] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:10,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360971890] [2023-04-01 08:57:10,514 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:57:10,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:10,514 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:10,517 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:10,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 08:57:10,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:10,595 INFO L262 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 08:57:10,597 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:10,661 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:57:10,661 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:10,704 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:57:10,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360971890] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:10,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [485924801] [2023-04-01 08:57:10,707 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:10,707 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:10,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:10,707 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:10,708 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:10,736 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:11,302 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:11,325 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:11,329 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:12,095 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2971#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#valid)_BEFORE_CALL_7| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_7| (Array Int (Array Int Int))) (|v_main_~#a~0.base_BEFORE_CALL_7| Int) (|v_old(#length)_BEFORE_CALL_7| (Array Int Int))) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 1) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_7|)) (= 14 (select |v_old(#length)_BEFORE_CALL_7| 2)) (= (select |v_old(#valid)_BEFORE_CALL_7| 2) 1) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 1) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_7| 3) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#valid)_BEFORE_CALL_7|)) (= 2 (select |v_old(#length)_BEFORE_CALL_7| 1)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_7|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| |v_main_~#a~0.base_BEFORE_CALL_7|) 0) (= (select |v_old(#length)_BEFORE_CALL_7| 3) 12) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#length)_BEFORE_CALL_7|)) (not (= |v_old(#valid)_BEFORE_CALL_7| |v_old(#length)_BEFORE_CALL_7|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:12,096 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:12,096 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:12,096 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2023-04-01 08:57:12,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915139458] [2023-04-01 08:57:12,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:12,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-01 08:57:12,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:12,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-01 08:57:12,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2023-04-01 08:57:12,098 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:12,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:12,268 INFO L93 Difference]: Finished difference Result 108 states and 130 transitions. [2023-04-01 08:57:12,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-01 08:57:12,269 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 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 39 [2023-04-01 08:57:12,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:12,269 INFO L225 Difference]: With dead ends: 108 [2023-04-01 08:57:12,269 INFO L226 Difference]: Without dead ends: 58 [2023-04-01 08:57:12,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 95 SyntacticMatches, 6 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:57:12,271 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:12,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 23 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:12,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-04-01 08:57:12,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-04-01 08:57:12,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 53 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:12,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2023-04-01 08:57:12,280 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 39 [2023-04-01 08:57:12,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:12,280 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2023-04-01 08:57:12,280 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:12,280 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2023-04-01 08:57:12,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 08:57:12,281 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:12,281 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:12,291 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:12,487 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 [2023-04-01 08:57:12,487 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:12,487 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:12,487 INFO L85 PathProgramCache]: Analyzing trace with hash -1392037869, now seen corresponding path program 8 times [2023-04-01 08:57:12,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:12,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356749578] [2023-04-01 08:57:12,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:12,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:12,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:12,616 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-04-01 08:57:12,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:12,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356749578] [2023-04-01 08:57:12,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356749578] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:12,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435293027] [2023-04-01 08:57:12,617 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:57:12,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:12,617 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:12,618 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:12,645 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 08:57:12,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:57:12,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:12,699 INFO L262 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 08:57:12,701 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:12,765 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-04-01 08:57:12,765 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:12,826 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-04-01 08:57:12,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435293027] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:12,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165451748] [2023-04-01 08:57:12,828 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:12,828 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:12,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:12,828 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:12,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:12,858 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:13,408 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:13,429 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:13,433 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:14,103 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3563#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#memory_int)_BEFORE_CALL_8| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_8| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_8| Int) (|v_old(#length)_BEFORE_CALL_8| (Array Int Int))) (and (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_8|)) (not (= |v_old(#valid)_BEFORE_CALL_8| |v_old(#length)_BEFORE_CALL_8|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_8|)) (= 12 (select |v_old(#length)_BEFORE_CALL_8| 3)) (not (= |v_old(#length)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_8|)) (= (select |v_old(#valid)_BEFORE_CALL_8| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_8| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_8| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 0) 48) (not (= |v_old(#valid)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (= (select |v_old(#valid)_BEFORE_CALL_8| |v_main_~#a~0.base_BEFORE_CALL_8|) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 1) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_8|)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_8|)) (= 14 (select |v_old(#length)_BEFORE_CALL_8| 2)) (= (select |v_old(#valid)_BEFORE_CALL_8| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_8| 2) 1))) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:14,103 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:14,103 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:14,103 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-04-01 08:57:14,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896229590] [2023-04-01 08:57:14,103 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:14,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 08:57:14,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:14,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 08:57:14,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=653, Unknown=0, NotChecked=0, Total=756 [2023-04-01 08:57:14,105 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:14,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:14,261 INFO L93 Difference]: Finished difference Result 85 states and 105 transitions. [2023-04-01 08:57:14,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 08:57:14,262 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 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 40 [2023-04-01 08:57:14,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:14,262 INFO L225 Difference]: With dead ends: 85 [2023-04-01 08:57:14,263 INFO L226 Difference]: Without dead ends: 46 [2023-04-01 08:57:14,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 96 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=169, Invalid=887, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 08:57:14,264 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 178 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:14,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [178 Valid, 38 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:14,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-01 08:57:14,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-04-01 08:57:14,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:14,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2023-04-01 08:57:14,270 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 40 [2023-04-01 08:57:14,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:14,270 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2023-04-01 08:57:14,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:14,271 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2023-04-01 08:57:14,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 08:57:14,271 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:14,271 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:14,279 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:14,476 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 [2023-04-01 08:57:14,477 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:14,477 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:14,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1068351597, now seen corresponding path program 9 times [2023-04-01 08:57:14,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:14,477 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409644381] [2023-04-01 08:57:14,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:14,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:14,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:18,086 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:18,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:18,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409644381] [2023-04-01 08:57:18,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409644381] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:18,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496788964] [2023-04-01 08:57:18,087 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:57:18,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:18,087 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:18,089 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:18,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 08:57:18,175 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:57:18,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:18,179 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 118 conjunts are in the unsatisfiable core [2023-04-01 08:57:18,182 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:18,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 08:57:19,382 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:19,383 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:21,485 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:57:21,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496788964] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:21,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1989742055] [2023-04-01 08:57:21,486 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:21,486 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:21,487 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:21,487 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:21,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:21,515 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:22,097 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:22,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:22,122 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:23,613 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4186#(and (exists ((|v_old(#valid)_BEFORE_CALL_9| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_9| Int) (|v_old(#length)_BEFORE_CALL_9| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_9| (Array Int (Array Int Int)))) (and (= (select |v_old(#valid)_BEFORE_CALL_9| 1) 1) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 1) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= (select |v_old(#valid)_BEFORE_CALL_9| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_9| 3) 12) (= 14 (select |v_old(#length)_BEFORE_CALL_9| 2)) (= (select |v_old(#valid)_BEFORE_CALL_9| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_9|)) (not (= |v_old(#valid)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= |v_old(#valid)_BEFORE_CALL_9| |v_old(#length)_BEFORE_CALL_9|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 0)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_9|)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= (select |v_old(#valid)_BEFORE_CALL_9| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_9| |v_main_~#a~0.base_BEFORE_CALL_9|) 0) (= (select |v_old(#length)_BEFORE_CALL_9| 1) 2))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:23,613 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:23,613 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:23,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 35, 32] total 86 [2023-04-01 08:57:23,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156404747] [2023-04-01 08:57:23,614 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:23,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2023-04-01 08:57:23,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:23,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2023-04-01 08:57:23,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=8998, Unknown=0, NotChecked=0, Total=9312 [2023-04-01 08:57:23,617 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 86 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 84 states have internal predecessors, (101), 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) [2023-04-01 08:57:27,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:27,701 INFO L93 Difference]: Finished difference Result 109 states and 129 transitions. [2023-04-01 08:57:27,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-04-01 08:57:27,701 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 84 states have internal predecessors, (101), 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 45 [2023-04-01 08:57:27,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:27,703 INFO L225 Difference]: With dead ends: 109 [2023-04-01 08:57:27,703 INFO L226 Difference]: Without dead ends: 104 [2023-04-01 08:57:27,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3790 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=664, Invalid=15592, Unknown=0, NotChecked=0, Total=16256 [2023-04-01 08:57:27,707 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 11 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 3003 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 3100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 3003 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:27,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 353 Invalid, 3100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 3003 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-04-01 08:57:27,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-04-01 08:57:27,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 75. [2023-04-01 08:57:27,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.2142857142857142) internal successors, (85), 70 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) [2023-04-01 08:57:27,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2023-04-01 08:57:27,726 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 45 [2023-04-01 08:57:27,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:27,726 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2023-04-01 08:57:27,727 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 84 states have internal predecessors, (101), 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) [2023-04-01 08:57:27,727 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2023-04-01 08:57:27,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 08:57:27,727 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:27,727 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:27,741 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:27,933 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 [2023-04-01 08:57:27,934 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:27,934 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:27,934 INFO L85 PathProgramCache]: Analyzing trace with hash 1573715998, now seen corresponding path program 10 times [2023-04-01 08:57:27,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:27,934 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218929718] [2023-04-01 08:57:27,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:27,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:27,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:28,096 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-04-01 08:57:28,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:28,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218929718] [2023-04-01 08:57:28,096 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218929718] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:28,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684814492] [2023-04-01 08:57:28,097 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:57:28,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:28,097 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:28,098 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:28,122 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-01 08:57:28,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:28,184 INFO L262 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:57:28,185 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:28,272 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-04-01 08:57:28,273 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:28,348 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-04-01 08:57:28,349 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684814492] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:28,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1747736816] [2023-04-01 08:57:28,350 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:28,351 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:28,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:28,352 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:28,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:28,380 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:28,946 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:28,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:28,967 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:29,575 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4907#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_old(#memory_int)_BEFORE_CALL_10| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_10| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_10| Int) (|v_old(#length)_BEFORE_CALL_10| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_10| |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#length)_BEFORE_CALL_10| 3) 12) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 0)) (= (select |v_old(#length)_BEFORE_CALL_10| 2) 14) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 1)) (not (= |v_old(#valid)_BEFORE_CALL_10| (select |v_old(#memory_int)_BEFORE_CALL_10| 1))) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_10| 1)) (= (select |v_old(#valid)_BEFORE_CALL_10| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 1) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_10| 1) |v_old(#length)_BEFORE_CALL_10|)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_10| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_10| |v_main_~#a~0.base_BEFORE_CALL_10|) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 0) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 3)))) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:29,575 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:29,575 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:29,575 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-01 08:57:29,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633093389] [2023-04-01 08:57:29,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:29,576 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:57:29,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:29,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:57:29,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:57:29,577 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:29,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:29,773 INFO L93 Difference]: Finished difference Result 148 states and 175 transitions. [2023-04-01 08:57:29,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 08:57:29,773 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 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 46 [2023-04-01 08:57:29,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:29,774 INFO L225 Difference]: With dead ends: 148 [2023-04-01 08:57:29,774 INFO L226 Difference]: Without dead ends: 70 [2023-04-01 08:57:29,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 112 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=190, Invalid=1070, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 08:57:29,775 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:29,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 49 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:29,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-04-01 08:57:29,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2023-04-01 08:57:29,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.2) internal successors, (78), 65 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:29,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 82 transitions. [2023-04-01 08:57:29,794 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 82 transitions. Word has length 46 [2023-04-01 08:57:29,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:29,794 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 82 transitions. [2023-04-01 08:57:29,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:29,795 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 82 transitions. [2023-04-01 08:57:29,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-04-01 08:57:29,795 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:29,795 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:29,801 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:29,998 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 [2023-04-01 08:57:29,999 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:29,999 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:29,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1387195117, now seen corresponding path program 11 times [2023-04-01 08:57:29,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:29,999 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253185852] [2023-04-01 08:57:29,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:29,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:30,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:30,146 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 08:57:30,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:30,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253185852] [2023-04-01 08:57:30,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1253185852] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:30,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790975764] [2023-04-01 08:57:30,146 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:57:30,146 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:30,147 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:30,148 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:30,170 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 08:57:30,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 08:57:30,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:30,237 INFO L262 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:57:30,238 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:30,327 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 08:57:30,327 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:30,426 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 08:57:30,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790975764] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:30,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1591291672] [2023-04-01 08:57:30,432 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:30,432 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:30,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:30,432 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:30,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:30,458 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:31,025 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:31,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:31,050 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:31,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5650#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#memory_int)_BEFORE_CALL_11| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_11| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_11| Int) (|v_old(#length)_BEFORE_CALL_11| (Array Int Int))) (and (not (= |v_main_~#a~0.base_BEFORE_CALL_11| 2)) (not (= |v_old(#valid)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (= (select |v_old(#valid)_BEFORE_CALL_11| |v_main_~#a~0.base_BEFORE_CALL_11|) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_11| |#StackHeapBarrier|)) (= 1 (select |v_old(#valid)_BEFORE_CALL_11| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_11| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 1) 0) (= 14 (select |v_old(#length)_BEFORE_CALL_11| 2)) (not (= |v_old(#length)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (= 12 (select |v_old(#length)_BEFORE_CALL_11| 3)) (not (= |v_main_~#a~0.base_BEFORE_CALL_11| 3)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 0)) (not (= |v_main_~#a~0.base_BEFORE_CALL_11| 1)) (= (select |v_old(#valid)_BEFORE_CALL_11| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_11| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_11| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_11| |v_old(#length)_BEFORE_CALL_11|)) (= (select |v_old(#valid)_BEFORE_CALL_11| 0) 0))) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:31,643 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:31,643 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:31,643 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-01 08:57:31,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855856985] [2023-04-01 08:57:31,643 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:31,644 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:57:31,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:31,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:57:31,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=801, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:57:31,645 INFO L87 Difference]: Start difference. First operand 70 states and 82 transitions. Second operand has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:31,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:31,811 INFO L93 Difference]: Finished difference Result 106 states and 128 transitions. [2023-04-01 08:57:31,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 08:57:31,811 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 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 47 [2023-04-01 08:57:31,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:31,812 INFO L225 Difference]: With dead ends: 106 [2023-04-01 08:57:31,812 INFO L226 Difference]: Without dead ends: 59 [2023-04-01 08:57:31,813 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 114 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=1109, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 08:57:31,813 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 51 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:31,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 68 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:31,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-04-01 08:57:31,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 53. [2023-04-01 08:57:31,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 48 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:31,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2023-04-01 08:57:31,823 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 47 [2023-04-01 08:57:31,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:31,823 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2023-04-01 08:57:31,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:31,823 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2023-04-01 08:57:31,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-04-01 08:57:31,823 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:31,824 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:31,833 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:32,029 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 [2023-04-01 08:57:32,030 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:32,030 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:32,030 INFO L85 PathProgramCache]: Analyzing trace with hash 1802399532, now seen corresponding path program 12 times [2023-04-01 08:57:32,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:32,030 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775791743] [2023-04-01 08:57:32,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:32,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:32,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat