/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-fpi/s4if.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 09:08:11,696 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 09:08:11,697 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 09:08:11,723 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 09:08:11,724 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 09:08:11,725 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 09:08:11,726 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 09:08:11,727 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 09:08:11,731 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 09:08:11,737 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 09:08:11,739 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 09:08:11,743 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 09:08:11,743 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 09:08:11,746 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 09:08:11,747 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 09:08:11,749 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 09:08:11,750 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 09:08:11,751 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 09:08:11,754 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 09:08:11,758 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 09:08:11,759 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 09:08:11,763 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 09:08:11,764 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 09:08:11,764 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 09:08:11,767 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 09:08:11,767 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 09:08:11,767 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 09:08:11,768 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 09:08:11,768 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 09:08:11,769 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 09:08:11,769 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 09:08:11,770 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 09:08:11,770 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 09:08:11,771 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 09:08:11,771 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 09:08:11,772 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 09:08:11,772 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 09:08:11,774 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 09:08:11,775 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 09:08:11,778 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 09:08:11,778 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 09:08:11,780 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 09:08:11,812 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 09:08:11,812 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 09:08:11,816 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 09:08:11,816 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 09:08:11,817 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 09:08:11,817 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 09:08:11,817 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 09:08:11,817 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 09:08:11,818 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 09:08:11,818 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 09:08:11,818 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 09:08:11,819 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 09:08:11,819 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 09:08:11,819 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 09:08:11,819 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 09:08:11,819 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 09:08:11,819 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 09:08:11,819 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 09:08:11,820 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 09:08:11,820 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 09:08:11,820 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 09:08:11,820 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 09:08:11,820 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 09:08:11,821 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 09:08:11,821 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 09:08:11,821 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 09:08:11,821 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 09:08:11,821 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 09:08:11,822 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 09:08:11,822 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 09:08:11,822 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 09:08:11,822 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 09:08:11,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:08:11,822 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 09:08:11,822 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 09:08:11,823 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 09:08:11,823 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 09:08:11,823 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 09:08:11,823 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 09:08:11,823 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 09:08:11,823 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 09:08:11,823 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 09:08:12,079 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 09:08:12,099 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 09:08:12,102 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 09:08:12,103 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 09:08:12,103 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 09:08:12,104 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/s4if.c [2023-04-01 09:08:13,299 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 09:08:13,483 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 09:08:13,483 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/s4if.c [2023-04-01 09:08:13,487 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c490c66e4/36d035bfefe84616a981bf3d0f58b603/FLAG3c5135359 [2023-04-01 09:08:13,500 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c490c66e4/36d035bfefe84616a981bf3d0f58b603 [2023-04-01 09:08:13,503 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 09:08:13,505 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 09:08:13,507 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 09:08:13,507 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 09:08:13,509 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 09:08:13,510 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,511 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@575c7f0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13, skipping insertion in model container [2023-04-01 09:08:13,511 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,517 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 09:08:13,535 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 09:08:13,682 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-fpi/s4if.c[587,600] [2023-04-01 09:08:13,702 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:08:13,711 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 09:08:13,727 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-fpi/s4if.c[587,600] [2023-04-01 09:08:13,742 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:08:13,755 INFO L208 MainTranslator]: Completed translation [2023-04-01 09:08:13,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13 WrapperNode [2023-04-01 09:08:13,755 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 09:08:13,756 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 09:08:13,756 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 09:08:13,757 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 09:08:13,766 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,767 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,780 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,781 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,795 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,798 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,799 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,799 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,801 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 09:08:13,802 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 09:08:13,802 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 09:08:13,802 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 09:08:13,803 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (1/1) ... [2023-04-01 09:08:13,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:08:13,817 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:13,838 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 09:08:13,861 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 09:08:13,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 09:08:13,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 09:08:13,876 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 09:08:13,878 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 09:08:13,878 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 09:08:13,878 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 09:08:13,878 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 09:08:13,878 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 09:08:13,878 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 09:08:13,878 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 09:08:13,878 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 09:08:13,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 09:08:13,880 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 09:08:13,880 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 09:08:13,880 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 09:08:13,963 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 09:08:13,965 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 09:08:14,116 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 09:08:14,159 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 09:08:14,159 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 09:08:14,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:08:14 BoogieIcfgContainer [2023-04-01 09:08:14,162 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 09:08:14,164 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 09:08:14,164 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 09:08:14,166 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 09:08:14,167 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 09:08:13" (1/3) ... [2023-04-01 09:08:14,167 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b492653 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:08:14, skipping insertion in model container [2023-04-01 09:08:14,167 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:08:13" (2/3) ... [2023-04-01 09:08:14,168 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b492653 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:08:14, skipping insertion in model container [2023-04-01 09:08:14,168 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:08:14" (3/3) ... [2023-04-01 09:08:14,169 INFO L112 eAbstractionObserver]: Analyzing ICFG s4if.c [2023-04-01 09:08:14,183 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 09:08:14,183 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 09:08:14,236 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 09:08:14,242 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;@54142b07, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 09:08:14,242 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 09:08:14,246 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 09:08:14,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-01 09:08:14,252 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:14,252 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:14,253 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:14,257 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:14,257 INFO L85 PathProgramCache]: Analyzing trace with hash 2049730117, now seen corresponding path program 1 times [2023-04-01 09:08:14,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:14,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037415780] [2023-04-01 09:08:14,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:14,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:14,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:08:14,652 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 09:08:14,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:14,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037415780] [2023-04-01 09:08:14,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037415780] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:08:14,653 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:08:14,654 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 09:08:14,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524201529] [2023-04-01 09:08:14,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:08:14,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 09:08:14,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:14,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 09:08:14,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 09:08:14,694 INFO L87 Difference]: Start difference. First operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:14,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:14,779 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2023-04-01 09:08:14,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 09:08:14,781 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2023-04-01 09:08:14,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:14,787 INFO L225 Difference]: With dead ends: 43 [2023-04-01 09:08:14,787 INFO L226 Difference]: Without dead ends: 19 [2023-04-01 09:08:14,789 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 09:08:14,793 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 18 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:14,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 42 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:08:14,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-04-01 09:08:14,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-04-01 09:08:14,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:14,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2023-04-01 09:08:14,833 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2023-04-01 09:08:14,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:14,834 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2023-04-01 09:08:14,834 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:14,835 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2023-04-01 09:08:14,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 09:08:14,836 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:14,836 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 09:08:14,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 09:08:14,836 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:14,840 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:14,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1910355142, now seen corresponding path program 1 times [2023-04-01 09:08:14,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:14,841 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679450222] [2023-04-01 09:08:14,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:14,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:14,887 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:14,888 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [833387033] [2023-04-01 09:08:14,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:14,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:14,888 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:14,899 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 09:08:14,917 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 09:08:15,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:08:15,012 INFO L262 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-01 09:08:15,019 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:15,149 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 09:08:15,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:15,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 09:08:15,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:15,374 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2023-04-01 09:08:15,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:15,483 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:15,644 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-04-01 09:08:15,794 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 09:08:15,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:15,888 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:15,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679450222] [2023-04-01 09:08:15,889 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:15,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833387033] [2023-04-01 09:08:15,889 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833387033] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:15,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1574914790] [2023-04-01 09:08:15,930 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:15,930 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:15,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:15,937 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:15,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:16,129 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:17,883 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:17,951 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:17,964 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:17,976 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:19,973 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '246#(and (exists ((|v_old(#length)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_3| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_3| (Array Int Int)) (|v_main_~#sum~0.base_BEFORE_CALL_1| Int)) (and (not (= (select |v_old(#memory_int)_BEFORE_CALL_3| 2) |v_old(#length)_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 2) 6) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 0) 48) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_3| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_3| |v_old(#length)_BEFORE_CALL_3|)) (= (select |v_old(#valid)_BEFORE_CALL_3| |v_main_~#sum~0.base_BEFORE_CALL_1|) 0) (= 2 (select |v_old(#length)_BEFORE_CALL_3| 1)) (= (select |v_old(#length)_BEFORE_CALL_3| 3) 12) (= 52 (select (select |v_old(#memory_int)_BEFORE_CALL_3| 2) 1)) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_1|)) (not (= |v_old(#length)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (not (= (select |v_old(#memory_int)_BEFORE_CALL_3| 2) |v_old(#valid)_BEFORE_CALL_3|)) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_1|)) (not (= |v_old(#valid)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_1|) 0))) (= (select |v_old(#valid)_BEFORE_CALL_3| 2) 1) (= 102 (select (select |v_old(#memory_int)_BEFORE_CALL_3| 2) 3)) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (not (= |v_main_~#sum~0.base_BEFORE_CALL_1| |#StackHeapBarrier|)) (= 115 (select (select |v_old(#memory_int)_BEFORE_CALL_3| 2) 0)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_1| 1)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_1| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 2) 4) 46) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 2) 5) 99) (= (select |v_old(#valid)_BEFORE_CALL_3| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_3| 2) 7) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 2) 2) 105) (not (= (select |v_old(#memory_int)_BEFORE_CALL_3| 2) (select |v_old(#memory_int)_BEFORE_CALL_3| 1))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:19,973 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:19,974 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:19,974 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2023-04-01 09:08:19,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144553633] [2023-04-01 09:08:19,975 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:19,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-01 09:08:19,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:19,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-01 09:08:19,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 09:08:19,978 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 21 states, 16 states have (on average 1.3125) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 09:08:20,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:20,243 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2023-04-01 09:08:20,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 09:08:20,243 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 1.3125) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 18 [2023-04-01 09:08:20,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:20,244 INFO L225 Difference]: With dead ends: 27 [2023-04-01 09:08:20,244 INFO L226 Difference]: Without dead ends: 22 [2023-04-01 09:08:20,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=170, Invalid=1312, Unknown=0, NotChecked=0, Total=1482 [2023-04-01 09:08:20,246 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 38 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:20,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 52 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:08:20,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-01 09:08:20,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2023-04-01 09:08:20,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:20,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2023-04-01 09:08:20,251 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 18 [2023-04-01 09:08:20,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:20,252 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2023-04-01 09:08:20,252 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 1.3125) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 09:08:20,252 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2023-04-01 09:08:20,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 09:08:20,252 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:20,253 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:20,265 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 09:08:20,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:20,454 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:20,454 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:20,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1034670718, now seen corresponding path program 2 times [2023-04-01 09:08:20,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:20,454 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220486098] [2023-04-01 09:08:20,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:20,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:20,477 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:20,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [974510250] [2023-04-01 09:08:20,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:08:20,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:20,478 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:20,485 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 09:08:20,486 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 09:08:20,547 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 09:08:20,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:08:20,548 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 09:08:20,550 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:20,591 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:20,591 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:20,622 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:20,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:20,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220486098] [2023-04-01 09:08:20,622 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:20,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974510250] [2023-04-01 09:08:20,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974510250] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:20,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1491427656] [2023-04-01 09:08:20,624 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:20,624 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:20,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:20,625 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:20,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:20,708 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:21,973 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:22,035 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:22,046 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:22,067 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:23,585 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '466#(and (exists ((|v_old(#valid)_BEFORE_CALL_7| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_7| (Array Int (Array Int Int))) (|v_main_~#sum~0.base_BEFORE_CALL_2| Int) (|v_old(#length)_BEFORE_CALL_7| (Array Int Int))) (and (= (select |v_old(#valid)_BEFORE_CALL_7| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_7| 2) 1) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_2|) 0))) (= (select |v_old(#valid)_BEFORE_CALL_7| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 1) 0) (= 99 (select (select |v_old(#memory_int)_BEFORE_CALL_7| 2) 5)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 0) 48) (= 7 (select |v_old(#length)_BEFORE_CALL_7| 2)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_2| 0)) (= (select |v_old(#valid)_BEFORE_CALL_7| 3) 1) (= 52 (select (select |v_old(#memory_int)_BEFORE_CALL_7| 2) 1)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#valid)_BEFORE_CALL_7|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 2) |v_old(#length)_BEFORE_CALL_7|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 2) 6) 0) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_2|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 2) 2) 105) (= 2 (select |v_old(#length)_BEFORE_CALL_7| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 2) 0) 115) (not (= |v_main_~#sum~0.base_BEFORE_CALL_2| 1)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_2| |#StackHeapBarrier|)) (= 0 (select |v_old(#valid)_BEFORE_CALL_7| |v_main_~#sum~0.base_BEFORE_CALL_2|)) (= 46 (select (select |v_old(#memory_int)_BEFORE_CALL_7| 2) 4)) (= (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 (= 2 |v_main_~#sum~0.base_BEFORE_CALL_2|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 2) |v_old(#valid)_BEFORE_CALL_7|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 2) 3) 102) (not (= |v_old(#valid)_BEFORE_CALL_7| |v_old(#length)_BEFORE_CALL_7|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) (select |v_old(#memory_int)_BEFORE_CALL_7| 2))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:23,585 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:23,586 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:23,586 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2023-04-01 09:08:23,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807657844] [2023-04-01 09:08:23,587 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:23,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 09:08:23,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:23,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 09:08:23,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2023-04-01 09:08:23,588 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:23,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:23,668 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2023-04-01 09:08:23,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 09:08:23,668 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-04-01 09:08:23,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:23,670 INFO L225 Difference]: With dead ends: 30 [2023-04-01 09:08:23,670 INFO L226 Difference]: Without dead ends: 22 [2023-04-01 09:08:23,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2023-04-01 09:08:23,672 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:23,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 55 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:08:23,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-01 09:08:23,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2023-04-01 09:08:23,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:23,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2023-04-01 09:08:23,677 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 19 [2023-04-01 09:08:23,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:23,677 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2023-04-01 09:08:23,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:23,678 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2023-04-01 09:08:23,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 09:08:23,678 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:23,678 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:23,689 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 09:08:23,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 09:08:23,884 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:23,885 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:23,885 INFO L85 PathProgramCache]: Analyzing trace with hash -2078488509, now seen corresponding path program 3 times [2023-04-01 09:08:23,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:23,885 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224469462] [2023-04-01 09:08:23,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:23,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:23,918 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:23,918 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2067091614] [2023-04-01 09:08:23,918 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:08:23,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:23,919 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:23,926 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 09:08:23,928 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 09:08:23,988 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:08:23,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:08:23,989 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 09:08:23,990 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:24,024 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:24,024 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:24,055 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:24,055 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:24,055 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224469462] [2023-04-01 09:08:24,055 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:24,055 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067091614] [2023-04-01 09:08:24,056 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067091614] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:24,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691592048] [2023-04-01 09:08:24,060 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:24,060 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:24,061 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:24,061 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:24,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:24,124 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:25,324 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:25,413 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:25,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:25,439 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:26,751 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '689#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 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_~#sum~0.base_BEFORE_CALL_3| Int) (|v_old(#length)_BEFORE_CALL_11| (Array Int Int))) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 2) 1) 52) (not (= (select |v_old(#memory_int)_BEFORE_CALL_11| 2) |v_old(#valid)_BEFORE_CALL_11|)) (not (= |v_old(#valid)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 2) 6) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_11| 2) (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (= 1 (select |v_old(#valid)_BEFORE_CALL_11| 2)) (= 7 (select |v_old(#length)_BEFORE_CALL_11| 2)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_11| 2) |v_old(#length)_BEFORE_CALL_11|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 1) 0) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_3|) 0))) (not (= |v_old(#length)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (= (select |v_old(#valid)_BEFORE_CALL_11| |v_main_~#sum~0.base_BEFORE_CALL_3|) 0) (= 12 (select |v_old(#length)_BEFORE_CALL_11| 3)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 0)) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_3|)) (= 115 (select (select |v_old(#memory_int)_BEFORE_CALL_11| 2) 0)) (= (select |v_old(#valid)_BEFORE_CALL_11| 1) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 2) 5) 99) (not (= |v_main_~#sum~0.base_BEFORE_CALL_3| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 2) 2) 105) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 2) 4) 46) (not (= |v_main_~#sum~0.base_BEFORE_CALL_3| 0)) (= (select |v_old(#valid)_BEFORE_CALL_11| 3) 1) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 2) 3) 102) (= (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 (= |v_main_~#sum~0.base_BEFORE_CALL_3| |#StackHeapBarrier|)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:26,752 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:26,752 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:26,752 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-04-01 09:08:26,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871365391] [2023-04-01 09:08:26,752 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:26,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 09:08:26,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:26,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 09:08:26,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=445, Unknown=0, NotChecked=0, Total=506 [2023-04-01 09:08:26,753 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:26,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:26,835 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2023-04-01 09:08:26,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 09:08:26,835 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-04-01 09:08:26,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:26,836 INFO L225 Difference]: With dead ends: 26 [2023-04-01 09:08:26,836 INFO L226 Difference]: Without dead ends: 21 [2023-04-01 09:08:26,837 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 32 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2023-04-01 09:08:26,838 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 8 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:26,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 47 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:08:26,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-01 09:08:26,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-04-01 09:08:26,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:26,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2023-04-01 09:08:26,843 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2023-04-01 09:08:26,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:26,843 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2023-04-01 09:08:26,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:26,843 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2023-04-01 09:08:26,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-01 09:08:26,844 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:26,844 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:26,849 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 09:08:27,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:27,044 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:27,045 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:27,045 INFO L85 PathProgramCache]: Analyzing trace with hash -134772315, now seen corresponding path program 4 times [2023-04-01 09:08:27,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:27,045 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945932526] [2023-04-01 09:08:27,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:27,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:27,059 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:27,059 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [224841062] [2023-04-01 09:08:27,059 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 09:08:27,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:27,060 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:27,061 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 09:08:27,068 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 09:08:27,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:08:27,122 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-01 09:08:27,136 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:27,154 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 09:08:27,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:27,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 09:08:27,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:27,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-04-01 09:08:27,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:27,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-04-01 09:08:27,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:27,337 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-04-01 09:08:27,408 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:27,408 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:27,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-04-01 09:08:27,543 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-04-01 09:08:27,779 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 09:08:27,802 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:27,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:27,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945932526] [2023-04-01 09:08:27,803 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:27,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224841062] [2023-04-01 09:08:27,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224841062] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:27,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2134101198] [2023-04-01 09:08:27,808 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:27,809 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:27,809 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:27,809 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:27,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:27,876 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:28,958 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:29,012 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:29,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:29,029 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:30,656 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '925#(and (exists ((|v_old(#length)_BEFORE_CALL_15| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_15| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_15| (Array Int Int)) (|v_main_~#sum~0.base_BEFORE_CALL_4| Int)) (and (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_4|)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_4| |#StackHeapBarrier|)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_4| 1)) (= (select |v_old(#valid)_BEFORE_CALL_15| 2) 1) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_4|)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_4| 0)) (= (select |v_old(#length)_BEFORE_CALL_15| 3) 12) (= 115 (select (select |v_old(#memory_int)_BEFORE_CALL_15| 2) 0)) (= (select |v_old(#valid)_BEFORE_CALL_15| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_15| |v_old(#length)_BEFORE_CALL_15|)) (not (= |v_old(#valid)_BEFORE_CALL_15| (select |v_old(#memory_int)_BEFORE_CALL_15| 1))) (= 7 (select |v_old(#length)_BEFORE_CALL_15| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_15| 1) 0) 48) (= (select (select |v_old(#memory_int)_BEFORE_CALL_15| 2) 1) 52) (= (select (select |v_old(#memory_int)_BEFORE_CALL_15| 2) 6) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_15| 2) |v_old(#length)_BEFORE_CALL_15|)) (= (select |v_old(#valid)_BEFORE_CALL_15| |v_main_~#sum~0.base_BEFORE_CALL_4|) 0) (= (select |v_old(#length)_BEFORE_CALL_15| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_15| 1) 1) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_4|) 0))) (not (= |v_old(#valid)_BEFORE_CALL_15| (select |v_old(#memory_int)_BEFORE_CALL_15| 2))) (= 46 (select (select |v_old(#memory_int)_BEFORE_CALL_15| 2) 4)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_15| 2) 2) 105) (not (= (select |v_old(#memory_int)_BEFORE_CALL_15| 2) (select |v_old(#memory_int)_BEFORE_CALL_15| 1))) (= 102 (select (select |v_old(#memory_int)_BEFORE_CALL_15| 2) 3)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_15| 2) 5) 99) (not (= |v_old(#length)_BEFORE_CALL_15| (select |v_old(#memory_int)_BEFORE_CALL_15| 1))) (= (select |v_old(#valid)_BEFORE_CALL_15| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_15| 1) 1) 0))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:30,656 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:30,656 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:30,656 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2023-04-01 09:08:30,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249668904] [2023-04-01 09:08:30,657 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:30,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-04-01 09:08:30,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:30,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-04-01 09:08:30,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1151, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 09:08:30,660 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 22 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-01 09:08:31,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:31,664 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2023-04-01 09:08:31,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-01 09:08:31,669 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2023-04-01 09:08:31,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:31,670 INFO L225 Difference]: With dead ends: 32 [2023-04-01 09:08:31,670 INFO L226 Difference]: Without dead ends: 27 [2023-04-01 09:08:31,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=162, Invalid=1644, Unknown=0, NotChecked=0, Total=1806 [2023-04-01 09:08:31,671 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 18 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:31,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 92 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 09:08:31,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-04-01 09:08:31,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2023-04-01 09:08:31,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:31,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-04-01 09:08:31,678 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 20 [2023-04-01 09:08:31,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:31,678 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-04-01 09:08:31,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-01 09:08:31,679 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-04-01 09:08:31,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 09:08:31,679 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:31,679 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:31,684 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-01 09:08:31,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:31,881 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:31,881 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:31,881 INFO L85 PathProgramCache]: Analyzing trace with hash -9112445, now seen corresponding path program 5 times [2023-04-01 09:08:31,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:31,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95814513] [2023-04-01 09:08:31,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:31,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:31,901 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:31,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2119729402] [2023-04-01 09:08:31,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:08:31,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:31,902 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:31,903 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 09:08:31,906 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 09:08:31,986 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 09:08:31,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:08:31,988 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 09:08:31,989 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:32,036 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:32,036 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:32,073 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:32,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:32,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95814513] [2023-04-01 09:08:32,073 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:32,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119729402] [2023-04-01 09:08:32,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119729402] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:32,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1536332818] [2023-04-01 09:08:32,075 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:32,076 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:32,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:32,076 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:32,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:32,133 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:33,174 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:33,232 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:33,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:33,247 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:34,569 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1180#(and (exists ((|v_old(#length)_BEFORE_CALL_19| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_19| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_19| (Array Int Int)) (|v_main_~#sum~0.base_BEFORE_CALL_5| Int)) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_19| |v_main_~#sum~0.base_BEFORE_CALL_5|) 0) (= 12 (select |v_old(#length)_BEFORE_CALL_19| 3)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) (select |v_old(#memory_int)_BEFORE_CALL_19| 2))) (not (= |v_main_~#sum~0.base_BEFORE_CALL_5| 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#valid)_BEFORE_CALL_19|)) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_5|) 0))) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 2) 3) 102) (= 52 (select (select |v_old(#memory_int)_BEFORE_CALL_19| 2) 1)) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_5|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#length)_BEFORE_CALL_19|)) (= (select |v_old(#valid)_BEFORE_CALL_19| 0) 0) (not (= |v_main_~#sum~0.base_BEFORE_CALL_5| |#StackHeapBarrier|)) (= 46 (select (select |v_old(#memory_int)_BEFORE_CALL_19| 2) 4)) (not (= |v_old(#length)_BEFORE_CALL_19| (select |v_old(#memory_int)_BEFORE_CALL_19| 2))) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_19| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_19| 1) 2) (not (= |v_main_~#sum~0.base_BEFORE_CALL_5| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 2) 6) 0) (= (select |v_old(#valid)_BEFORE_CALL_19| 2) 1) (= 7 (select |v_old(#length)_BEFORE_CALL_19| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 2) 2) 105) (not (= |v_old(#valid)_BEFORE_CALL_19| (select |v_old(#memory_int)_BEFORE_CALL_19| 2))) (= 1 (select |v_old(#valid)_BEFORE_CALL_19| 1)) (not (= |v_old(#valid)_BEFORE_CALL_19| |v_old(#length)_BEFORE_CALL_19|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 2) 5) 99) (= 115 (select (select |v_old(#memory_int)_BEFORE_CALL_19| 2) 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 1) 0))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:34,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:34,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:34,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2023-04-01 09:08:34,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900810108] [2023-04-01 09:08:34,569 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:34,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 09:08:34,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:34,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 09:08:34,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2023-04-01 09:08:34,571 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:34,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:34,675 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2023-04-01 09:08:34,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 09:08:34,675 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2023-04-01 09:08:34,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:34,676 INFO L225 Difference]: With dead ends: 33 [2023-04-01 09:08:34,676 INFO L226 Difference]: Without dead ends: 24 [2023-04-01 09:08:34,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2023-04-01 09:08:34,677 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:34,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 53 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:08:34,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-01 09:08:34,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2023-04-01 09:08:34,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:34,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-04-01 09:08:34,684 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 21 [2023-04-01 09:08:34,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:34,684 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-04-01 09:08:34,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 11 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:34,684 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-04-01 09:08:34,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 09:08:34,685 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:34,685 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:34,690 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 09:08:34,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:34,889 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:34,889 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:34,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1992274402, now seen corresponding path program 6 times [2023-04-01 09:08:34,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:34,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1890663785] [2023-04-01 09:08:34,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:34,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:34,906 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:34,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [922380715] [2023-04-01 09:08:34,906 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:08:34,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:34,906 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:34,907 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 09:08:34,911 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 09:08:34,974 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:08:34,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:08:34,975 INFO L262 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 09:08:34,976 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:35,025 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:35,025 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:35,063 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:35,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:35,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1890663785] [2023-04-01 09:08:35,063 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:35,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922380715] [2023-04-01 09:08:35,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922380715] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:35,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1356900498] [2023-04-01 09:08:35,065 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:35,065 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:35,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:35,065 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:35,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:35,113 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:36,109 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:36,157 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:36,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:36,173 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:37,460 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1430#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((|v_old(#memory_int)_BEFORE_CALL_23| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_23| (Array Int Int)) (|v_main_~#sum~0.base_BEFORE_CALL_6| Int) (|v_old(#length)_BEFORE_CALL_23| (Array Int Int))) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_23| 1) 0) 48) (= 115 (select (select |v_old(#memory_int)_BEFORE_CALL_23| 2) 0)) (= 12 (select |v_old(#length)_BEFORE_CALL_23| 3)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_23| 2) 6) 0) (= (select |v_old(#valid)_BEFORE_CALL_23| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_23| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_23| 1) 1) 0) (= 102 (select (select |v_old(#memory_int)_BEFORE_CALL_23| 2) 3)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_6| |#StackHeapBarrier|)) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_6|)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_6| 1)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_23| 1) |v_old(#length)_BEFORE_CALL_23|)) (not (= |v_old(#valid)_BEFORE_CALL_23| (select |v_old(#memory_int)_BEFORE_CALL_23| 1))) (not (= |v_old(#valid)_BEFORE_CALL_23| |v_old(#length)_BEFORE_CALL_23|)) (not (= |v_old(#valid)_BEFORE_CALL_23| (select |v_old(#memory_int)_BEFORE_CALL_23| 2))) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_6|) 0))) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_6|)) (= 52 (select (select |v_old(#memory_int)_BEFORE_CALL_23| 2) 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_23| 2) 4) 46) (not (= (select |v_old(#memory_int)_BEFORE_CALL_23| 2) |v_old(#length)_BEFORE_CALL_23|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_23| 2) 5) 99) (not (= |v_main_~#sum~0.base_BEFORE_CALL_6| 0)) (= (select |v_old(#valid)_BEFORE_CALL_23| |v_main_~#sum~0.base_BEFORE_CALL_6|) 0) (= 7 (select |v_old(#length)_BEFORE_CALL_23| 2)) (= (select |v_old(#valid)_BEFORE_CALL_23| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_23| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_23| 2) 2) 105) (not (= (select |v_old(#memory_int)_BEFORE_CALL_23| 2) (select |v_old(#memory_int)_BEFORE_CALL_23| 1))) (= (select |v_old(#length)_BEFORE_CALL_23| 1) 2))) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:37,460 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:37,461 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:37,461 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-04-01 09:08:37,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559887679] [2023-04-01 09:08:37,461 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:37,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 09:08:37,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:37,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 09:08:37,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2023-04-01 09:08:37,463 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:37,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:37,570 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2023-04-01 09:08:37,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 09:08:37,571 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2023-04-01 09:08:37,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:37,571 INFO L225 Difference]: With dead ends: 28 [2023-04-01 09:08:37,572 INFO L226 Difference]: Without dead ends: 23 [2023-04-01 09:08:37,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 34 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=111, Invalid=759, Unknown=0, NotChecked=0, Total=870 [2023-04-01 09:08:37,573 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 9 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:37,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 39 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 09:08:37,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-04-01 09:08:37,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-04-01 09:08:37,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:37,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-04-01 09:08:37,579 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 21 [2023-04-01 09:08:37,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:37,579 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-04-01 09:08:37,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:37,580 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-04-01 09:08:37,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-01 09:08:37,580 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:37,580 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:37,586 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 09:08:37,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:37,785 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:37,785 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:37,785 INFO L85 PathProgramCache]: Analyzing trace with hash 1504826342, now seen corresponding path program 7 times [2023-04-01 09:08:37,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:37,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537901043] [2023-04-01 09:08:37,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:37,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:37,799 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:37,799 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [395712498] [2023-04-01 09:08:37,799 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 09:08:37,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:37,799 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:37,800 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 09:08:37,807 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 09:08:37,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:08:37,898 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 60 conjunts are in the unsatisfiable core [2023-04-01 09:08:37,903 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:37,919 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 09:08:37,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:37,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 09:08:37,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:37,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-04-01 09:08:38,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:38,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 38 [2023-04-01 09:08:38,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:38,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-04-01 09:08:38,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:38,156 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-04-01 09:08:38,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 09:08:38,198 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-04-01 09:08:38,279 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:38,280 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:38,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-04-01 09:08:38,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-04-01 09:08:38,471 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:08:38,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 24 [2023-04-01 09:08:38,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-04-01 09:08:38,985 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 09:08:39,007 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:39,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:39,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537901043] [2023-04-01 09:08:39,007 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:39,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [395712498] [2023-04-01 09:08:39,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [395712498] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:39,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1392248557] [2023-04-01 09:08:39,009 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:39,009 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:39,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:39,009 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:39,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:39,060 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:40,134 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:40,188 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:40,198 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:40,202 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:41,812 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1692#(and (exists ((|v_old(#length)_BEFORE_CALL_27| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_27| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_27| (Array Int Int)) (|v_main_~#sum~0.base_BEFORE_CALL_7| Int)) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_27| 1) 0) 48) (not (= |v_old(#valid)_BEFORE_CALL_27| (select |v_old(#memory_int)_BEFORE_CALL_27| 1))) (not (= |v_main_~#sum~0.base_BEFORE_CALL_7| 0)) (not (= |v_old(#valid)_BEFORE_CALL_27| |v_old(#length)_BEFORE_CALL_27|)) (= (select |v_old(#length)_BEFORE_CALL_27| 1) 2) (= (select (select |v_old(#memory_int)_BEFORE_CALL_27| 2) 4) 46) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_7|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_27| 1) |v_old(#length)_BEFORE_CALL_27|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_27| 2) 5) 99) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_7|) 0))) (= (select |v_old(#valid)_BEFORE_CALL_27| 1) 1) (= 7 (select |v_old(#length)_BEFORE_CALL_27| 2)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_7| 1)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_7| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_27| 0) 0) (= 52 (select (select |v_old(#memory_int)_BEFORE_CALL_27| 2) 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_27| 1) 1) 0) (= 102 (select (select |v_old(#memory_int)_BEFORE_CALL_27| 2) 3)) (= (select |v_old(#valid)_BEFORE_CALL_27| 2) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_27| 2) 6) 0) (= 115 (select (select |v_old(#memory_int)_BEFORE_CALL_27| 2) 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_27| 2) 2) 105) (= (select |v_old(#valid)_BEFORE_CALL_27| |v_main_~#sum~0.base_BEFORE_CALL_7|) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_27| 1) (select |v_old(#memory_int)_BEFORE_CALL_27| 2))) (= 12 (select |v_old(#length)_BEFORE_CALL_27| 3)) (= (select |v_old(#valid)_BEFORE_CALL_27| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_27| (select |v_old(#memory_int)_BEFORE_CALL_27| 2))) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_7|)) (not (= |v_old(#length)_BEFORE_CALL_27| (select |v_old(#memory_int)_BEFORE_CALL_27| 2))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:41,812 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:41,812 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:41,812 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-04-01 09:08:41,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104506179] [2023-04-01 09:08:41,813 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:41,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-01 09:08:41,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:41,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-01 09:08:41,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1433, Unknown=0, NotChecked=0, Total=1560 [2023-04-01 09:08:41,814 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 26 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-01 09:08:46,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:46,566 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2023-04-01 09:08:46,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-01 09:08:46,567 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2023-04-01 09:08:46,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:46,567 INFO L225 Difference]: With dead ends: 35 [2023-04-01 09:08:46,567 INFO L226 Difference]: Without dead ends: 30 [2023-04-01 09:08:46,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=185, Invalid=1977, Unknown=0, NotChecked=0, Total=2162 [2023-04-01 09:08:46,569 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:46,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 92 Invalid, 373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-04-01 09:08:46,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-04-01 09:08:46,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2023-04-01 09:08:46,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:46,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2023-04-01 09:08:46,577 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2023-04-01 09:08:46,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:46,578 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2023-04-01 09:08:46,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-01 09:08:46,578 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2023-04-01 09:08:46,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-01 09:08:46,578 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:46,578 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:46,585 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 09:08:46,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:46,779 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:46,779 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:46,779 INFO L85 PathProgramCache]: Analyzing trace with hash -721161630, now seen corresponding path program 8 times [2023-04-01 09:08:46,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:46,779 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501311775] [2023-04-01 09:08:46,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:46,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:46,800 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:46,800 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2126781350] [2023-04-01 09:08:46,801 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:08:46,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:46,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:46,802 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 09:08:46,805 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 09:08:46,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 09:08:46,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:08:46,911 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 09:08:46,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:46,962 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:46,962 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:47,010 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:47,011 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:47,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501311775] [2023-04-01 09:08:47,011 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:47,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126781350] [2023-04-01 09:08:47,011 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126781350] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:47,011 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1054315202] [2023-04-01 09:08:47,012 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:47,012 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:47,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:47,013 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:47,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:47,056 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:48,019 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:48,068 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:48,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:48,085 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:49,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1972#(and (exists ((|v_old(#valid)_BEFORE_CALL_31| (Array Int Int)) (|v_main_~#sum~0.base_BEFORE_CALL_8| Int) (|v_old(#length)_BEFORE_CALL_31| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_31| (Array Int (Array Int Int)))) (and (not (= |v_old(#length)_BEFORE_CALL_31| (select |v_old(#memory_int)_BEFORE_CALL_31| 2))) (= 7 (select |v_old(#length)_BEFORE_CALL_31| 2)) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_8|)) (= (select |v_old(#valid)_BEFORE_CALL_31| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_31| 1) 1) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_31| 2) 0) 115) (= (select |v_old(#length)_BEFORE_CALL_31| 1) 2) (= (select (select |v_old(#memory_int)_BEFORE_CALL_31| 2) 2) 105) (not (= |v_old(#valid)_BEFORE_CALL_31| (select |v_old(#memory_int)_BEFORE_CALL_31| 2))) (not (= |v_old(#valid)_BEFORE_CALL_31| (select |v_old(#memory_int)_BEFORE_CALL_31| 1))) (= (select |v_old(#length)_BEFORE_CALL_31| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_31| 2) 1) (not (= |v_main_~#sum~0.base_BEFORE_CALL_8| 0)) (= (select |v_old(#valid)_BEFORE_CALL_31| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_31| 2) 5) 99) (not (= |v_main_~#sum~0.base_BEFORE_CALL_8| 1)) (not (= |v_old(#valid)_BEFORE_CALL_31| |v_old(#length)_BEFORE_CALL_31|)) (= 102 (select (select |v_old(#memory_int)_BEFORE_CALL_31| 2) 3)) (= 46 (select (select |v_old(#memory_int)_BEFORE_CALL_31| 2) 4)) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_8|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_31| 1) |v_old(#length)_BEFORE_CALL_31|)) (= (select |v_old(#valid)_BEFORE_CALL_31| |v_main_~#sum~0.base_BEFORE_CALL_8|) 0) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_8|) 0))) (not (= |v_main_~#sum~0.base_BEFORE_CALL_8| |#StackHeapBarrier|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_31| 1) 0)) (= 52 (select (select |v_old(#memory_int)_BEFORE_CALL_31| 2) 1)) (= (select |v_old(#valid)_BEFORE_CALL_31| 1) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_31| 1) (select |v_old(#memory_int)_BEFORE_CALL_31| 2))) (= (select (select |v_old(#memory_int)_BEFORE_CALL_31| 2) 6) 0))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:49,468 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:49,468 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:49,468 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2023-04-01 09:08:49,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573774260] [2023-04-01 09:08:49,468 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:49,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 09:08:49,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:49,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 09:08:49,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=661, Unknown=0, NotChecked=0, Total=756 [2023-04-01 09:08:49,470 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:49,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:49,619 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2023-04-01 09:08:49,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 09:08:49,621 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 23 [2023-04-01 09:08:49,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:49,621 INFO L225 Difference]: With dead ends: 36 [2023-04-01 09:08:49,621 INFO L226 Difference]: Without dead ends: 26 [2023-04-01 09:08:49,622 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=915, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 09:08:49,623 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:49,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 77 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:08:49,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-01 09:08:49,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-04-01 09:08:49,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:49,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-04-01 09:08:49,630 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 23 [2023-04-01 09:08:49,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:49,631 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-04-01 09:08:49,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 14 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:49,631 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-04-01 09:08:49,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-04-01 09:08:49,631 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:49,632 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:49,640 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 09:08:49,837 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,SelfDestructingSolverStorable8 [2023-04-01 09:08:49,838 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:49,838 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:49,838 INFO L85 PathProgramCache]: Analyzing trace with hash 1192288483, now seen corresponding path program 9 times [2023-04-01 09:08:49,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:49,838 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778877242] [2023-04-01 09:08:49,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:49,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:49,867 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:49,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1387649864] [2023-04-01 09:08:49,868 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:08:49,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:49,868 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:49,869 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 09:08:49,870 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 09:08:49,988 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:08:49,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:08:49,989 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 09:08:49,990 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:50,065 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:50,065 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:50,123 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:50,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:50,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778877242] [2023-04-01 09:08:50,123 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:50,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387649864] [2023-04-01 09:08:50,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387649864] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:50,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [478904867] [2023-04-01 09:08:50,125 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:50,125 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:50,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:50,125 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:50,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:50,179 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:51,039 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:51,075 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:51,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:51,090 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:52,370 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2249#(and (exists ((|v_old(#length)_BEFORE_CALL_35| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_35| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_35| (Array Int Int)) (|v_main_~#sum~0.base_BEFORE_CALL_9| Int)) (and (not (= |v_old(#length)_BEFORE_CALL_35| (select |v_old(#memory_int)_BEFORE_CALL_35| 1))) (not (= |v_main_~#sum~0.base_BEFORE_CALL_9| 1)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_9| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_35| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_35| 2) (select |v_old(#memory_int)_BEFORE_CALL_35| 1))) (= (select (select |v_old(#memory_int)_BEFORE_CALL_35| 2) 4) 46) (not (= |v_main_~#sum~0.base_BEFORE_CALL_9| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_35| 2) 5) 99) (= (select |v_old(#length)_BEFORE_CALL_35| 3) 12) (not (= |v_old(#valid)_BEFORE_CALL_35| |v_old(#length)_BEFORE_CALL_35|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_35| 1) 0)) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_9|)) (= 102 (select (select |v_old(#memory_int)_BEFORE_CALL_35| 2) 3)) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_9|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_35| 2) 2) 105) (= 1 (select |v_old(#valid)_BEFORE_CALL_35| 1)) (= (select |v_old(#valid)_BEFORE_CALL_35| |v_main_~#sum~0.base_BEFORE_CALL_9|) 0) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_9|) 0))) (= 52 (select (select |v_old(#memory_int)_BEFORE_CALL_35| 2) 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_35| 1) 1) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_35| 2) |v_old(#length)_BEFORE_CALL_35|)) (= (select |v_old(#valid)_BEFORE_CALL_35| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_35| 2) 6) 0) (= (select |v_old(#valid)_BEFORE_CALL_35| 3) 1) (= 115 (select (select |v_old(#memory_int)_BEFORE_CALL_35| 2) 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_35| 2) |v_old(#valid)_BEFORE_CALL_35|)) (= 2 (select |v_old(#length)_BEFORE_CALL_35| 1)) (= 7 (select |v_old(#length)_BEFORE_CALL_35| 2)) (not (= |v_old(#valid)_BEFORE_CALL_35| (select |v_old(#memory_int)_BEFORE_CALL_35| 1))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:52,370 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:52,370 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:52,370 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2023-04-01 09:08:52,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262623291] [2023-04-01 09:08:52,370 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:52,371 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-01 09:08:52,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:52,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-01 09:08:52,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2023-04-01 09:08:52,372 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:52,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:08:52,578 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2023-04-01 09:08:52,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 09:08:52,581 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 23 [2023-04-01 09:08:52,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:08:52,582 INFO L225 Difference]: With dead ends: 30 [2023-04-01 09:08:52,582 INFO L226 Difference]: Without dead ends: 25 [2023-04-01 09:08:52,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 36 SyntacticMatches, 5 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=147, Invalid=975, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 09:08:52,583 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 8 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:08:52,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 39 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:08:52,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-04-01 09:08:52,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-04-01 09:08:52,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:08:52,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2023-04-01 09:08:52,592 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2023-04-01 09:08:52,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:08:52,592 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2023-04-01 09:08:52,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:08:52,592 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2023-04-01 09:08:52,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 09:08:52,592 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:08:52,593 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:08:52,603 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 09:08:52,798 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-01 09:08:52,799 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:08:52,799 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:08:52,799 INFO L85 PathProgramCache]: Analyzing trace with hash -1819900667, now seen corresponding path program 10 times [2023-04-01 09:08:52,799 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:08:52,799 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413179294] [2023-04-01 09:08:52,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:08:52,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:08:52,812 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:08:52,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [844353896] [2023-04-01 09:08:52,813 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 09:08:52,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:08:52,813 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:08:52,817 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 09:08:52,818 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 09:08:52,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:08:52,899 INFO L262 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 76 conjunts are in the unsatisfiable core [2023-04-01 09:08:52,903 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:08:52,921 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 09:08:52,926 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-04-01 09:08:52,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 09:08:52,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-04-01 09:08:53,010 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 38 [2023-04-01 09:08:53,047 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 48 [2023-04-01 09:08:53,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 51 [2023-04-01 09:08:53,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 51 [2023-04-01 09:08:53,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 51 [2023-04-01 09:08:53,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 51 [2023-04-01 09:08:53,375 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:53,375 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:08:53,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-04-01 09:08:53,490 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-04-01 09:08:53,537 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:08:53,537 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 24 [2023-04-01 09:08:53,544 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-04-01 09:08:53,616 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:08:53,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 24 [2023-04-01 09:08:53,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-04-01 09:08:53,627 WARN L207 Elim1Store]: Array PQE input equivalent to true [2023-04-01 09:08:54,996 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 09:08:55,014 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:08:55,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:08:55,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413179294] [2023-04-01 09:08:55,015 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:08:55,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844353896] [2023-04-01 09:08:55,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844353896] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:08:55,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503545329] [2023-04-01 09:08:55,016 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-04-01 09:08:55,016 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:08:55,016 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:08:55,016 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:08:55,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:08:55,065 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 83 for LOIs [2023-04-01 09:08:55,932 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2023-04-01 09:08:55,976 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 88 for LOIs [2023-04-01 09:08:55,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:08:55,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:08:57,795 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2537#(and (exists ((|v_main_~#sum~0.base_BEFORE_CALL_10| Int) (|v_old(#length)_BEFORE_CALL_39| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_39| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_39| (Array Int Int))) (and (= (select |v_old(#valid)_BEFORE_CALL_39| 1) 1) (not (= |v_main_~#sum~0.base_BEFORE_CALL_10| 1)) (= 7 (select |v_old(#length)_BEFORE_CALL_39| 2)) (= (select |v_old(#valid)_BEFORE_CALL_39| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_39| 2) 4) 46) (not (= 3 |v_main_~#sum~0.base_BEFORE_CALL_10|)) (not (= |#StackHeapBarrier| |v_main_~#sum~0.base_BEFORE_CALL_10|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_39| 2) 2) 105) (= (select |v_old(#length)_BEFORE_CALL_39| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_39| |v_old(#length)_BEFORE_CALL_39|)) (= 102 (select (select |v_old(#memory_int)_BEFORE_CALL_39| 2) 3)) (= 52 (select (select |v_old(#memory_int)_BEFORE_CALL_39| 2) 1)) (not (= |v_main_~#sum~0.base_BEFORE_CALL_10| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_39| 2) 5) 99) (= (select (select |v_old(#memory_int)_BEFORE_CALL_39| 2) 6) 0) (not (= (* ~N~0 4) (select (select |#memory_int| |v_main_~#sum~0.base_BEFORE_CALL_10|) 0))) (not (= 2 |v_main_~#sum~0.base_BEFORE_CALL_10|)) (= (select |v_old(#valid)_BEFORE_CALL_39| |v_main_~#sum~0.base_BEFORE_CALL_10|) 0) (= (select |v_old(#valid)_BEFORE_CALL_39| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_39| 1) |v_old(#valid)_BEFORE_CALL_39|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_39| 1) 1) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_39| 1) (select |v_old(#memory_int)_BEFORE_CALL_39| 2))) (not (= |v_old(#valid)_BEFORE_CALL_39| (select |v_old(#memory_int)_BEFORE_CALL_39| 2))) (= 115 (select (select |v_old(#memory_int)_BEFORE_CALL_39| 2) 0)) (= (select |v_old(#valid)_BEFORE_CALL_39| 0) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_39| 1) |v_old(#length)_BEFORE_CALL_39|)) (= (select |v_old(#length)_BEFORE_CALL_39| 3) 12) (= (select (select |v_old(#memory_int)_BEFORE_CALL_39| 1) 0) 48) (not (= |v_old(#length)_BEFORE_CALL_39| (select |v_old(#memory_int)_BEFORE_CALL_39| 2))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:08:57,795 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:08:57,795 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:08:57,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 30 [2023-04-01 09:08:57,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13802732] [2023-04-01 09:08:57,795 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:08:57,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-04-01 09:08:57,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:08:57,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-04-01 09:08:57,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1745, Unknown=0, NotChecked=0, Total=1892 [2023-04-01 09:08:57,797 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 30 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3)