/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/ifncomp.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 09:05:24,490 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 09:05:24,491 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 09:05:24,512 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 09:05:24,512 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 09:05:24,515 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 09:05:24,516 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 09:05:24,517 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 09:05:24,518 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 09:05:24,518 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 09:05:24,519 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 09:05:24,520 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 09:05:24,520 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 09:05:24,521 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 09:05:24,521 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 09:05:24,522 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 09:05:24,523 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 09:05:24,523 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 09:05:24,524 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 09:05:24,526 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 09:05:24,526 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 09:05:24,531 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 09:05:24,531 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 09:05:24,532 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 09:05:24,534 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 09:05:24,534 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 09:05:24,534 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 09:05:24,535 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 09:05:24,535 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 09:05:24,536 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 09:05:24,536 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 09:05:24,537 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 09:05:24,537 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 09:05:24,538 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 09:05:24,538 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 09:05:24,538 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 09:05:24,539 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 09:05:24,539 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 09:05:24,539 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 09:05:24,540 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 09:05:24,540 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 09:05:24,541 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 09:05:24,563 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 09:05:24,563 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 09:05:24,563 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 09:05:24,563 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 09:05:24,564 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 09:05:24,564 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 09:05:24,564 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 09:05:24,567 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 09:05:24,567 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 09:05:24,567 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 09:05:24,567 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 09:05:24,567 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 09:05:24,568 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 09:05:24,568 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 09:05:24,568 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 09:05:24,568 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 09:05:24,568 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 09:05:24,568 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 09:05:24,569 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 09:05:24,569 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 09:05:24,569 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 09:05:24,569 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 09:05:24,569 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 09:05:24,569 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 09:05:24,569 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 09:05:24,570 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 09:05:24,570 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 09:05:24,570 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 09:05:24,570 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 09:05:24,570 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 09:05:24,570 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 09:05:24,570 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 09:05:24,570 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:05:24,571 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 09:05:24,571 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 09:05:24,571 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 09:05:24,571 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 09:05:24,571 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 09:05:24,571 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 09:05:24,571 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 09:05:24,571 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 09:05:24,571 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 09:05:24,758 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 09:05:24,778 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 09:05:24,780 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 09:05:24,781 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 09:05:24,781 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 09:05:24,782 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/ifncomp.c [2023-04-01 09:05:25,636 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 09:05:25,843 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 09:05:25,844 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ifncomp.c [2023-04-01 09:05:25,848 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6684f91ca/7ca0ed5fc5394fb9b5fc1de6875c0a02/FLAG1d0d8a99b [2023-04-01 09:05:25,858 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6684f91ca/7ca0ed5fc5394fb9b5fc1de6875c0a02 [2023-04-01 09:05:25,859 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 09:05:25,860 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 09:05:25,861 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 09:05:25,861 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 09:05:25,863 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 09:05:25,863 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:05:25" (1/1) ... [2023-04-01 09:05:25,864 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15b07406 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:25, skipping insertion in model container [2023-04-01 09:05:25,864 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:05:25" (1/1) ... [2023-04-01 09:05:25,871 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 09:05:25,880 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 09:05:25,964 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/ifncomp.c[590,603] [2023-04-01 09:05:25,990 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:05:26,001 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 09:05:26,011 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/ifncomp.c[590,603] [2023-04-01 09:05:26,032 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:05:26,048 INFO L208 MainTranslator]: Completed translation [2023-04-01 09:05:26,048 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26 WrapperNode [2023-04-01 09:05:26,048 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 09:05:26,049 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 09:05:26,049 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 09:05:26,049 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 09:05:26,057 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,057 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,071 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,072 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,087 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,090 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,095 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,095 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,097 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 09:05:26,098 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 09:05:26,098 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 09:05:26,098 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 09:05:26,098 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (1/1) ... [2023-04-01 09:05:26,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:05:26,114 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:26,123 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 09:05:26,124 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 09:05:26,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 09:05:26,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 09:05:26,154 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 09:05:26,155 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 09:05:26,155 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 09:05:26,156 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 09:05:26,156 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 09:05:26,156 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 09:05:26,156 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 09:05:26,156 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 09:05:26,156 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 09:05:26,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 09:05:26,158 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 09:05:26,158 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 09:05:26,219 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 09:05:26,220 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 09:05:26,387 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 09:05:26,507 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 09:05:26,507 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-04-01 09:05:26,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:05:26 BoogieIcfgContainer [2023-04-01 09:05:26,509 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 09:05:26,511 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 09:05:26,511 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 09:05:26,513 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 09:05:26,513 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 09:05:25" (1/3) ... [2023-04-01 09:05:26,514 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a142d45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:05:26, skipping insertion in model container [2023-04-01 09:05:26,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:05:26" (2/3) ... [2023-04-01 09:05:26,514 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a142d45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:05:26, skipping insertion in model container [2023-04-01 09:05:26,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:05:26" (3/3) ... [2023-04-01 09:05:26,515 INFO L112 eAbstractionObserver]: Analyzing ICFG ifncomp.c [2023-04-01 09:05:26,528 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 09:05:26,528 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 09:05:26,571 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 09:05:26,580 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;@4167c597, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 09:05:26,580 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 09:05:26,583 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 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 09:05:26,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 09:05:26,591 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:26,592 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 09:05:26,593 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:26,598 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:26,599 INFO L85 PathProgramCache]: Analyzing trace with hash -333657043, now seen corresponding path program 1 times [2023-04-01 09:05:26,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:26,605 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570660398] [2023-04-01 09:05:26,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:26,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:26,698 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:26,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [342072287] [2023-04-01 09:05:26,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:26,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:26,699 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:26,703 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 09:05:26,707 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 09:05:26,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:05:26,802 INFO L262 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-01 09:05:26,805 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:26,863 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 09:05:26,864 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 09:05:26,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:26,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570660398] [2023-04-01 09:05:26,864 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:26,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342072287] [2023-04-01 09:05:26,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342072287] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:05:26,865 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:05:26,865 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 09:05:26,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475942542] [2023-04-01 09:05:26,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:05:26,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 09:05:26,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:05:26,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 09:05:26,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 09:05:26,890 INFO L87 Difference]: Start difference. First operand has 26 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 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 3.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (4), 3 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 09:05:26,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:05:26,966 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2023-04-01 09:05:26,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 09:05:26,968 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2023-04-01 09:05:26,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:05:26,973 INFO L225 Difference]: With dead ends: 51 [2023-04-01 09:05:26,973 INFO L226 Difference]: Without dead ends: 28 [2023-04-01 09:05:26,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 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 09:05:26,977 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 26 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:05:26,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 33 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:05:26,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-04-01 09:05:26,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2023-04-01 09:05:27,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 09:05:27,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2023-04-01 09:05:27,002 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 18 [2023-04-01 09:05:27,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:05:27,002 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2023-04-01 09:05:27,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 3 states have call successors, (4), 3 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 09:05:27,003 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2023-04-01 09:05:27,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 09:05:27,003 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:27,003 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:05:27,011 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 09:05:27,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-04-01 09:05:27,209 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:27,209 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:27,210 INFO L85 PathProgramCache]: Analyzing trace with hash 231064878, now seen corresponding path program 1 times [2023-04-01 09:05:27,210 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:27,210 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725888358] [2023-04-01 09:05:27,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:27,210 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:27,261 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:27,261 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1433106655] [2023-04-01 09:05:27,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:27,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:27,262 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:27,263 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 09:05:27,267 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 09:05:27,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:05:27,372 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 25 conjunts are in the unsatisfiable core [2023-04-01 09:05:27,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:27,467 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 09:05:27,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 09:05:27,596 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 09:05:27,600 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:05:27,764 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:27,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-04-01 09:05:27,778 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:27,778 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 8 [2023-04-01 09:05:27,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-04-01 09:05:27,816 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 6 treesize of output 4 [2023-04-01 09:05:27,850 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 09:05:27,851 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:27,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725888358] [2023-04-01 09:05:27,851 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:27,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1433106655] [2023-04-01 09:05:27,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1433106655] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:05:27,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [202996891] [2023-04-01 09:05:27,890 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 09:05:27,890 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:05:27,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:05:27,897 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:05:27,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:05:28,011 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:05:29,641 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 78 for LOIs [2023-04-01 09:05:29,680 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:05:29,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:05:29,689 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:05:30,898 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '336#(and (exists ((v_main_~c~0.base_BEFORE_CALL_1 Int)) (and (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_1) 0) ~N~0)) (not (= v_main_~c~0.base_BEFORE_CALL_1 |#StackHeapBarrier|)) (not (= v_main_~c~0.base_BEFORE_CALL_1 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((v_main_~a~0.base_BEFORE_CALL_1 Int) (|v_old(#length)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_3| (Array Int (Array Int Int)))) (and (= (select |v_old(#length)_BEFORE_CALL_3| 2) 10) (= (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|)) (not (= v_main_~a~0.base_BEFORE_CALL_1 0)) (not (= v_main_~a~0.base_BEFORE_CALL_1 3)) (= 2 (select |v_old(#length)_BEFORE_CALL_3| 1)) (= (select |v_old(#length)_BEFORE_CALL_3| 3) 12) (not (= |v_old(#length)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| v_main_~a~0.base_BEFORE_CALL_1) 0) (not (= v_main_~a~0.base_BEFORE_CALL_1 1)) (not (= v_main_~a~0.base_BEFORE_CALL_1 |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 3) 1) (not (= v_main_~a~0.base_BEFORE_CALL_1 2)))) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (< 0 ~N~0) (= |#NULL.base| 0))' at error location [2023-04-01 09:05:30,899 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:05:30,899 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:05:30,899 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2023-04-01 09:05:30,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928035569] [2023-04-01 09:05:30,899 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:05:30,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-01 09:05:30,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:05:30,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-01 09:05:30,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2023-04-01 09:05:30,901 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 16 states, 13 states have (on average 2.0) internal successors, (26), 14 states have internal predecessors, (26), 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 09:05:31,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:05:31,148 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2023-04-01 09:05:31,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-01 09:05:31,149 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.0) internal successors, (26), 14 states have internal predecessors, (26), 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 21 [2023-04-01 09:05:31,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:05:31,150 INFO L225 Difference]: With dead ends: 41 [2023-04-01 09:05:31,150 INFO L226 Difference]: Without dead ends: 39 [2023-04-01 09:05:31,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=123, Invalid=1067, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 09:05:31,151 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 32 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:05:31,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 85 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 09:05:31,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-04-01 09:05:31,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 32. [2023-04-01 09:05:31,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 23 states have internal predecessors, (27), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 09:05:31,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2023-04-01 09:05:31,156 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 21 [2023-04-01 09:05:31,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:05:31,157 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2023-04-01 09:05:31,157 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.0) internal successors, (26), 14 states have internal predecessors, (26), 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 09:05:31,157 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2023-04-01 09:05:31,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-01 09:05:31,157 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:31,157 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:05:31,165 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 09:05:31,366 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,SelfDestructingSolverStorable1 [2023-04-01 09:05:31,366 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:31,366 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:31,366 INFO L85 PathProgramCache]: Analyzing trace with hash -1567508773, now seen corresponding path program 2 times [2023-04-01 09:05:31,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:31,367 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693146354] [2023-04-01 09:05:31,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:31,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:31,404 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:31,404 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2084325932] [2023-04-01 09:05:31,404 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:05:31,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:31,404 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:31,418 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 09:05:31,419 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 09:05:31,501 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 09:05:31,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:05:31,502 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 09:05:31,503 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:31,528 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 09:05:31,528 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:05:31,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 09:05:31,554 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:31,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693146354] [2023-04-01 09:05:31,554 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:31,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084325932] [2023-04-01 09:05:31,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084325932] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:05:31,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1777975357] [2023-04-01 09:05:31,556 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 09:05:31,556 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:05:31,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:05:31,556 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:05:31,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:05:31,584 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:05:32,534 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 78 for LOIs [2023-04-01 09:05:32,556 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:05:32,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:05:32,566 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:05:33,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '612#(and (exists ((v_main_~a~0.base_BEFORE_CALL_2 Int) (|v_old(#valid)_BEFORE_CALL_7| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_7| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_7| (Array Int Int))) (and (not (= v_main_~a~0.base_BEFORE_CALL_2 1)) (= (select |v_old(#valid)_BEFORE_CALL_7| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_7| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_7| 0) 0) (= 10 (select |v_old(#length)_BEFORE_CALL_7| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 1) 0) (not (= v_main_~a~0.base_BEFORE_CALL_2 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_7| 3) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#valid)_BEFORE_CALL_7|)) (= 2 (select |v_old(#length)_BEFORE_CALL_7| 1)) (not (= v_main_~a~0.base_BEFORE_CALL_2 3)) (= (select |v_old(#valid)_BEFORE_CALL_7| v_main_~a~0.base_BEFORE_CALL_2) 0) (= (select |v_old(#length)_BEFORE_CALL_7| 3) 12) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#length)_BEFORE_CALL_7|)) (not (= v_main_~a~0.base_BEFORE_CALL_2 |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_7| |v_old(#length)_BEFORE_CALL_7|)) (not (= v_main_~a~0.base_BEFORE_CALL_2 2)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((v_main_~c~0.base_BEFORE_CALL_2 Int)) (and (not (= v_main_~c~0.base_BEFORE_CALL_2 0)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_2) 0) ~N~0)) (not (= v_main_~c~0.base_BEFORE_CALL_2 |#StackHeapBarrier|)))) (< 0 ~N~0) (= |#NULL.base| 0))' at error location [2023-04-01 09:05:33,496 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:05:33,496 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:05:33,496 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-04-01 09:05:33,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143795204] [2023-04-01 09:05:33,496 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:05:33,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-01 09:05:33,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:05:33,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-01 09:05:33,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2023-04-01 09:05:33,498 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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 09:05:33,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:05:33,605 INFO L93 Difference]: Finished difference Result 65 states and 78 transitions. [2023-04-01 09:05:33,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 09:05:33,605 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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 22 [2023-04-01 09:05:33,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:05:33,606 INFO L225 Difference]: With dead ends: 65 [2023-04-01 09:05:33,606 INFO L226 Difference]: Without dead ends: 34 [2023-04-01 09:05:33,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=87, Invalid=563, Unknown=0, NotChecked=0, Total=650 [2023-04-01 09:05:33,607 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 10 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:05:33,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 56 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:05:33,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-01 09:05:33,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2023-04-01 09:05:33,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 09:05:33,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-04-01 09:05:33,611 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 22 [2023-04-01 09:05:33,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:05:33,611 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-04-01 09:05:33,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 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 09:05:33,611 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-04-01 09:05:33,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 09:05:33,611 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:33,612 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:05:33,627 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 09:05:33,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:33,817 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:33,817 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:33,817 INFO L85 PathProgramCache]: Analyzing trace with hash 1049912781, now seen corresponding path program 3 times [2023-04-01 09:05:33,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:33,817 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48671624] [2023-04-01 09:05:33,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:33,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:33,841 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:33,841 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [779365223] [2023-04-01 09:05:33,841 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:05:33,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:33,842 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:33,842 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 09:05:33,850 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 09:05:34,048 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:05:34,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:05:34,049 INFO L262 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-01 09:05:34,051 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:34,070 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 09:05:34,080 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 09:05:34,096 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 09:05:34,110 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 09:05:34,111 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:05:34,214 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 5 treesize of output 3 [2023-04-01 09:05:34,272 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:34,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-04-01 09:05:34,281 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:34,282 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 8 [2023-04-01 09:05:34,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 32 treesize of output 20 [2023-04-01 09:05:34,297 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 34 treesize of output 32 [2023-04-01 09:05:34,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 24 [2023-04-01 09:05:34,317 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 09:05:34,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:34,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48671624] [2023-04-01 09:05:34,318 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:34,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779365223] [2023-04-01 09:05:34,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779365223] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:05:34,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1089492040] [2023-04-01 09:05:34,320 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 09:05:34,320 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:05:34,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:05:34,321 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:05:34,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:05:34,354 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:05:35,254 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 78 for LOIs [2023-04-01 09:05:35,277 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:05:35,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:05:35,284 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:05:36,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '940#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#memory_int)_BEFORE_CALL_11| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_11| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_11| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_3 Int)) (and (not (= v_main_~a~0.base_BEFORE_CALL_3 1)) (not (= |v_old(#valid)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (not (= v_main_~a~0.base_BEFORE_CALL_3 2)) (not (= v_main_~a~0.base_BEFORE_CALL_3 3)) (= 1 (select |v_old(#valid)_BEFORE_CALL_11| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_11| v_main_~a~0.base_BEFORE_CALL_3) 0) (not (= |v_old(#length)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (not (= v_main_~a~0.base_BEFORE_CALL_3 |#StackHeapBarrier|)) (= 12 (select |v_old(#length)_BEFORE_CALL_11| 3)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_11| 1) 1) (not (= v_main_~a~0.base_BEFORE_CALL_3 0)) (= (select |v_old(#valid)_BEFORE_CALL_11| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_11| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_11| |v_old(#length)_BEFORE_CALL_11|)) (= (select |v_old(#valid)_BEFORE_CALL_11| 0) 0) (= (select |v_old(#length)_BEFORE_CALL_11| 2) 10))) (= |#NULL.offset| 0) (exists ((v_main_~c~0.base_BEFORE_CALL_3 Int)) (and (not (= v_main_~c~0.base_BEFORE_CALL_3 |#StackHeapBarrier|)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_3) 0) ~N~0)) (not (= v_main_~c~0.base_BEFORE_CALL_3 0)))) (< 0 ~N~0) (= |#NULL.base| 0))' at error location [2023-04-01 09:05:36,307 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:05:36,307 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:05:36,307 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2023-04-01 09:05:36,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125983016] [2023-04-01 09:05:36,307 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:05:36,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 09:05:36,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:05:36,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 09:05:36,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=893, Unknown=0, NotChecked=0, Total=992 [2023-04-01 09:05:36,309 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:05:36,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:05:36,589 INFO L93 Difference]: Finished difference Result 51 states and 60 transitions. [2023-04-01 09:05:36,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 09:05:36,589 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2023-04-01 09:05:36,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:05:36,590 INFO L225 Difference]: With dead ends: 51 [2023-04-01 09:05:36,590 INFO L226 Difference]: Without dead ends: 49 [2023-04-01 09:05:36,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1067, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 09:05:36,592 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 29 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:05:36,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 120 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 09:05:36,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-01 09:05:36,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 36. [2023-04-01 09:05:36,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 09:05:36,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2023-04-01 09:05:36,599 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 24 [2023-04-01 09:05:36,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:05:36,599 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2023-04-01 09:05:36,600 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:05:36,600 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2023-04-01 09:05:36,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-01 09:05:36,600 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:36,600 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:05:36,607 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 09:05:36,807 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:36,807 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:36,808 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:36,808 INFO L85 PathProgramCache]: Analyzing trace with hash -554897491, now seen corresponding path program 4 times [2023-04-01 09:05:36,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:36,808 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134866279] [2023-04-01 09:05:36,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:36,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:36,845 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:36,845 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [38719635] [2023-04-01 09:05:36,845 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 09:05:36,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:36,845 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:36,853 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 09:05:36,854 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 09:05:36,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:05:36,918 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 09:05:36,919 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:36,955 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:05:36,955 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:05:37,009 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:05:37,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:37,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134866279] [2023-04-01 09:05:37,009 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:37,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38719635] [2023-04-01 09:05:37,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38719635] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:05:37,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [840715932] [2023-04-01 09:05:37,010 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 09:05:37,011 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:05:37,011 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:05:37,011 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:05:37,011 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:05:37,043 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:05:37,889 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 78 for LOIs [2023-04-01 09:05:37,909 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:05:37,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:05:37,917 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:05:38,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1267#(and (= |__VERIFIER_assert_#in~cond| 0) (exists ((v_main_~c~0.base_BEFORE_CALL_4 Int)) (and (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_4) 0) ~N~0)) (not (= v_main_~c~0.base_BEFORE_CALL_4 |#StackHeapBarrier|)) (not (= v_main_~c~0.base_BEFORE_CALL_4 0)))) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (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_~a~0.base_BEFORE_CALL_4 Int)) (and (not (= v_main_~a~0.base_BEFORE_CALL_4 1)) (= (select |v_old(#valid)_BEFORE_CALL_15| v_main_~a~0.base_BEFORE_CALL_4) 0) (= (select |v_old(#valid)_BEFORE_CALL_15| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_15| 3) 12) (= (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))) (= (select (select |v_old(#memory_int)_BEFORE_CALL_15| 1) 0) 48) (not (= v_main_~a~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 (= v_main_~a~0.base_BEFORE_CALL_4 3)) (not (= v_main_~a~0.base_BEFORE_CALL_4 2)) (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) (not (= v_main_~a~0.base_BEFORE_CALL_4 |#StackHeapBarrier|)) (= (select |v_old(#length)_BEFORE_CALL_15| 2) 10))) (= |#NULL.offset| 0) (< 0 ~N~0) (= |#NULL.base| 0))' at error location [2023-04-01 09:05:38,857 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:05:38,857 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:05:38,857 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-04-01 09:05:38,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804835012] [2023-04-01 09:05:38,857 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:05:38,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 09:05:38,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:05:38,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 09:05:38,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=610, Unknown=2, NotChecked=0, Total=702 [2023-04-01 09:05:38,858 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 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 09:05:39,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:05:39,034 INFO L93 Difference]: Finished difference Result 91 states and 107 transitions. [2023-04-01 09:05:39,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 09:05:39,035 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 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 26 [2023-04-01 09:05:39,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:05:39,038 INFO L225 Difference]: With dead ends: 91 [2023-04-01 09:05:39,038 INFO L226 Difference]: Without dead ends: 66 [2023-04-01 09:05:39,039 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=751, Unknown=2, NotChecked=0, Total=870 [2023-04-01 09:05:39,040 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 25 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:05:39,040 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 85 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:05:39,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-04-01 09:05:39,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 55. [2023-04-01 09:05:39,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 43 states have internal predecessors, (50), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 09:05:39,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2023-04-01 09:05:39,047 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 26 [2023-04-01 09:05:39,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:05:39,048 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2023-04-01 09:05:39,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 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 09:05:39,048 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2023-04-01 09:05:39,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 09:05:39,048 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:39,048 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:05:39,055 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 09:05:39,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:39,249 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:39,249 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:39,249 INFO L85 PathProgramCache]: Analyzing trace with hash -678784645, now seen corresponding path program 5 times [2023-04-01 09:05:39,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:39,250 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606380717] [2023-04-01 09:05:39,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:39,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:39,285 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:39,285 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1668230765] [2023-04-01 09:05:39,285 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:05:39,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:39,285 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:39,288 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 09:05:39,296 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 09:05:39,552 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 09:05:39,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:05:39,554 INFO L262 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 09:05:39,555 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:39,608 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 09:05:39,609 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:05:39,667 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 09:05:39,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:39,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606380717] [2023-04-01 09:05:39,667 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:39,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668230765] [2023-04-01 09:05:39,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668230765] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:05:39,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1121546805] [2023-04-01 09:05:39,669 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 09:05:39,669 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:05:39,669 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:05:39,669 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:05:39,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:05:39,704 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:05:40,447 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 78 for LOIs [2023-04-01 09:05:40,466 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:05:40,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:05:40,473 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:05:41,426 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1707#(and (exists ((v_main_~c~0.base_BEFORE_CALL_5 Int)) (and (not (= v_main_~c~0.base_BEFORE_CALL_5 |#StackHeapBarrier|)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_5) 0) ~N~0)) (not (= v_main_~c~0.base_BEFORE_CALL_5 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (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_~a~0.base_BEFORE_CALL_5 Int)) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 0) 48) (not (= v_main_~a~0.base_BEFORE_CALL_5 0)) (= 12 (select |v_old(#length)_BEFORE_CALL_19| 3)) (not (= v_main_~a~0.base_BEFORE_CALL_5 1)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#valid)_BEFORE_CALL_19|)) (= (select |v_old(#valid)_BEFORE_CALL_19| v_main_~a~0.base_BEFORE_CALL_5) 0) (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_~a~0.base_BEFORE_CALL_5 2)) (= (select |v_old(#valid)_BEFORE_CALL_19| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_19| 2) 10) (= (select |v_old(#length)_BEFORE_CALL_19| 1) 2) (not (= v_main_~a~0.base_BEFORE_CALL_5 |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_19| 2) 1) (not (= v_main_~a~0.base_BEFORE_CALL_5 3)) (= 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| 1) 1) 0))) (< 0 ~N~0) (= |#NULL.base| 0))' at error location [2023-04-01 09:05:41,426 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:05:41,426 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:05:41,426 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2023-04-01 09:05:41,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69572699] [2023-04-01 09:05:41,427 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:05:41,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-01 09:05:41,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:05:41,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-01 09:05:41,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=758, Unknown=0, NotChecked=0, Total=870 [2023-04-01 09:05:41,428 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 15 states have internal predecessors, (25), 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 09:05:41,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:05:41,723 INFO L93 Difference]: Finished difference Result 123 states and 145 transitions. [2023-04-01 09:05:41,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 09:05:41,724 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 15 states have internal predecessors, (25), 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 28 [2023-04-01 09:05:41,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:05:41,725 INFO L225 Difference]: With dead ends: 123 [2023-04-01 09:05:41,725 INFO L226 Difference]: Without dead ends: 89 [2023-04-01 09:05:41,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 50 SyntacticMatches, 5 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=190, Invalid=1142, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 09:05:41,726 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 43 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:05:41,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 80 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 09:05:41,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-04-01 09:05:41,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 75. [2023-04-01 09:05:41,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 60 states have internal predecessors, (72), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 09:05:41,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 87 transitions. [2023-04-01 09:05:41,741 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 87 transitions. Word has length 28 [2023-04-01 09:05:41,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:05:41,741 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 87 transitions. [2023-04-01 09:05:41,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 15 states have internal predecessors, (25), 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 09:05:41,741 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 87 transitions. [2023-04-01 09:05:41,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 09:05:41,742 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:41,742 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:05:41,749 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-01 09:05:41,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:41,949 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:41,949 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:41,949 INFO L85 PathProgramCache]: Analyzing trace with hash 485406573, now seen corresponding path program 6 times [2023-04-01 09:05:41,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:41,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34631872] [2023-04-01 09:05:41,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:41,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:42,001 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:42,001 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1220924791] [2023-04-01 09:05:42,001 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:05:42,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:42,002 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:42,003 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 09:05:42,005 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 09:05:43,350 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:05:43,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:05:43,354 INFO L262 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-01 09:05:43,357 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:43,395 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 09:05:43,407 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 09:05:43,422 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 09:05:43,440 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 09:05:43,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 09:05:43,487 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-01 09:05:43,488 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:05:43,607 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 5 treesize of output 3 [2023-04-01 09:05:43,718 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 5 treesize of output 3 [2023-04-01 09:05:43,828 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 5 treesize of output 3 [2023-04-01 09:05:43,938 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:43,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-04-01 09:05:43,948 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:43,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 8 [2023-04-01 09:05:43,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 54 treesize of output 42 [2023-04-01 09:05:43,963 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 386 treesize of output 382 [2023-04-01 09:05:43,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 182 treesize of output 150 [2023-04-01 09:05:44,032 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-04-01 09:05:44,033 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:44,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34631872] [2023-04-01 09:05:44,033 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:44,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220924791] [2023-04-01 09:05:44,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220924791] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:05:44,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1203877269] [2023-04-01 09:05:44,035 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 09:05:44,035 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:05:44,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:05:44,035 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:05:44,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:05:44,066 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:05:44,815 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 78 for LOIs [2023-04-01 09:05:44,833 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:05:44,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:05:44,841 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:05:45,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2265#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_23| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_23| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_23| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_6 Int)) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_23| 1) 0) 48) (not (= v_main_~a~0.base_BEFORE_CALL_6 |#StackHeapBarrier|)) (= 12 (select |v_old(#length)_BEFORE_CALL_23| 3)) (= (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) (not (= v_main_~a~0.base_BEFORE_CALL_6 2)) (= 10 (select |v_old(#length)_BEFORE_CALL_23| 2)) (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_main_~a~0.base_BEFORE_CALL_6 0)) (not (= v_main_~a~0.base_BEFORE_CALL_6 1)) (= (select |v_old(#valid)_BEFORE_CALL_23| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_23| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_23| v_main_~a~0.base_BEFORE_CALL_6) 0) (not (= v_main_~a~0.base_BEFORE_CALL_6 3)) (= (select |v_old(#length)_BEFORE_CALL_23| 1) 2))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (exists ((v_main_~c~0.base_BEFORE_CALL_6 Int)) (and (not (= ~N~0 (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_6) 0))) (not (= v_main_~c~0.base_BEFORE_CALL_6 |#StackHeapBarrier|)) (not (= v_main_~c~0.base_BEFORE_CALL_6 0)))) (< 0 ~N~0) (= |#NULL.base| 0))' at error location [2023-04-01 09:05:45,939 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:05:45,939 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:05:45,940 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 23 [2023-04-01 09:05:45,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648112855] [2023-04-01 09:05:45,940 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:05:45,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-01 09:05:45,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:05:45,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-01 09:05:45,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1271, Unknown=1, NotChecked=0, Total=1406 [2023-04-01 09:05:45,941 INFO L87 Difference]: Start difference. First operand 75 states and 87 transitions. Second operand has 23 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:05:46,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:05:46,653 INFO L93 Difference]: Finished difference Result 118 states and 144 transitions. [2023-04-01 09:05:46,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-01 09:05:46,654 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2023-04-01 09:05:46,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:05:46,655 INFO L225 Difference]: With dead ends: 118 [2023-04-01 09:05:46,655 INFO L226 Difference]: Without dead ends: 116 [2023-04-01 09:05:46,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=184, Invalid=1621, Unknown=1, NotChecked=0, Total=1806 [2023-04-01 09:05:46,656 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 55 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 09:05:46,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 138 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 09:05:46,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-04-01 09:05:46,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 85. [2023-04-01 09:05:46,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 67 states have (on average 1.2537313432835822) internal successors, (84), 69 states have internal predecessors, (84), 10 states have call successors, (10), 9 states have call predecessors, (10), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 09:05:46,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 101 transitions. [2023-04-01 09:05:46,669 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 101 transitions. Word has length 30 [2023-04-01 09:05:46,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:05:46,669 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 101 transitions. [2023-04-01 09:05:46,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 21 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:05:46,670 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 101 transitions. [2023-04-01 09:05:46,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-01 09:05:46,670 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:46,670 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:05:46,687 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 09:05:46,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:46,880 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:46,881 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:46,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1770007380, now seen corresponding path program 1 times [2023-04-01 09:05:46,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:46,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903472715] [2023-04-01 09:05:46,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:46,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:46,895 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:46,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [353320182] [2023-04-01 09:05:46,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:46,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:46,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:46,905 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 09:05:46,906 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 09:05:47,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:05:47,068 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 44 conjunts are in the unsatisfiable core [2023-04-01 09:05:47,071 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:47,080 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 44 treesize of output 42 [2023-04-01 09:05:47,103 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 09:05:47,119 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 09:05:47,145 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 09:05:47,170 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 34 treesize of output 32 [2023-04-01 09:05:47,343 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:47,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 17 [2023-04-01 09:05:47,373 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 09:05:47,373 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:05:47,660 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 5 [2023-04-01 09:05:50,474 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:50,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-04-01 09:05:50,483 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:05:50,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 9 treesize of output 8 [2023-04-01 09:05:50,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 212 treesize of output 198 [2023-04-01 09:05:50,516 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 69 treesize of output 65 [2023-04-01 09:05:50,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 33 [2023-04-01 09:05:50,591 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 09:05:50,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:50,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903472715] [2023-04-01 09:05:50,591 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:50,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353320182] [2023-04-01 09:05:50,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353320182] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:05:50,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [505800965] [2023-04-01 09:05:50,593 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 09:05:50,593 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:05:50,593 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:05:50,593 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:05:50,593 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:05:50,614 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:05:52,028 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 99 for LOIs [2023-04-01 09:05:52,067 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:05:52,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:05:52,074 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:05:55,240 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2841#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= ~N~0 0)) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#length)_BEFORE_CALL_37| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_37| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_37| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_17 Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_37| 0) 0) (not (= v_main_~a~0.base_BEFORE_CALL_17 2)) (= (select |v_old(#length)_BEFORE_CALL_37| 2) 10) (not (= v_main_~a~0.base_BEFORE_CALL_17 3)) (= (select |v_old(#valid)_BEFORE_CALL_37| 3) 1) (not (= v_main_~a~0.base_BEFORE_CALL_17 |#StackHeapBarrier|)) (not (= v_main_~a~0.base_BEFORE_CALL_17 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_37| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_37| 3) 12) (not (= v_main_~a~0.base_BEFORE_CALL_17 1)) (= 1 (select |v_old(#valid)_BEFORE_CALL_37| 1)) (not (= |v_old(#length)_BEFORE_CALL_37| (select |v_old(#memory_int)_BEFORE_CALL_37| 1))) (= (select |v_old(#valid)_BEFORE_CALL_37| v_main_~a~0.base_BEFORE_CALL_17) 0) (= 2 (select |v_old(#length)_BEFORE_CALL_37| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_37| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_37| 2) 1) (not (= |v_old(#valid)_BEFORE_CALL_37| |v_old(#length)_BEFORE_CALL_37|)) (not (= |v_old(#valid)_BEFORE_CALL_37| (select |v_old(#memory_int)_BEFORE_CALL_37| 1))))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:05:55,240 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:05:55,240 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:05:55,240 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 27 [2023-04-01 09:05:55,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318325138] [2023-04-01 09:05:55,241 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:05:55,241 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-01 09:05:55,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:05:55,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-01 09:05:55,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1738, Unknown=4, NotChecked=0, Total=1892 [2023-04-01 09:05:55,243 INFO L87 Difference]: Start difference. First operand 85 states and 101 transitions. Second operand has 27 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 09:05:57,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:05:57,976 INFO L93 Difference]: Finished difference Result 117 states and 134 transitions. [2023-04-01 09:05:57,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-01 09:05:57,977 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2023-04-01 09:05:57,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:05:57,978 INFO L225 Difference]: With dead ends: 117 [2023-04-01 09:05:57,978 INFO L226 Difference]: Without dead ends: 98 [2023-04-01 09:05:57,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=269, Invalid=2483, Unknown=4, NotChecked=0, Total=2756 [2023-04-01 09:05:57,979 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 31 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 30 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:05:57,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 184 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 364 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2023-04-01 09:05:57,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-04-01 09:05:57,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 92. [2023-04-01 09:05:57,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 70 states have (on average 1.1857142857142857) internal successors, (83), 73 states have internal predecessors, (83), 12 states have call successors, (12), 11 states have call predecessors, (12), 9 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 09:05:58,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 104 transitions. [2023-04-01 09:05:58,000 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 104 transitions. Word has length 31 [2023-04-01 09:05:58,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:05:58,000 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 104 transitions. [2023-04-01 09:05:58,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 09:05:58,000 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 104 transitions. [2023-04-01 09:05:58,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-01 09:05:58,001 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:05:58,001 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:05:58,009 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 09:05:58,201 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,SelfDestructingSolverStorable7 [2023-04-01 09:05:58,201 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:05:58,201 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:05:58,202 INFO L85 PathProgramCache]: Analyzing trace with hash -1608172652, now seen corresponding path program 2 times [2023-04-01 09:05:58,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:05:58,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399441269] [2023-04-01 09:05:58,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:05:58,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:05:58,230 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:05:58,230 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [282660433] [2023-04-01 09:05:58,231 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:05:58,231 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:05:58,231 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:05:58,232 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 09:05:58,234 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 09:05:58,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 09:05:58,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:05:58,580 INFO L262 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 09:05:58,581 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:05:58,619 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 09:05:58,619 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:05:58,673 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-04-01 09:05:58,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:05:58,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399441269] [2023-04-01 09:05:58,674 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:05:58,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282660433] [2023-04-01 09:05:58,674 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282660433] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:05:58,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318483687] [2023-04-01 09:05:58,676 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 09:05:58,676 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:05:58,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:05:58,677 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:05:58,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:05:58,701 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:06:00,081 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 99 for LOIs [2023-04-01 09:06:00,127 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:06:00,132 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:06:00,134 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:06:02,141 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3439#(and (exists ((|v_old(#length)_BEFORE_CALL_51| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_28 Int) (|v_old(#memory_int)_BEFORE_CALL_51| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_51| (Array Int Int))) (and (= (select |v_old(#valid)_BEFORE_CALL_51| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_51| |v_old(#length)_BEFORE_CALL_51|)) (not (= v_main_~a~0.base_BEFORE_CALL_28 3)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_51| 1) |v_old(#length)_BEFORE_CALL_51|)) (= (select |v_old(#valid)_BEFORE_CALL_51| 1) 1) (not (= v_main_~a~0.base_BEFORE_CALL_28 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_51| 1) 1) 0) (= 2 (select |v_old(#length)_BEFORE_CALL_51| 1)) (= 12 (select |v_old(#length)_BEFORE_CALL_51| 3)) (= (select |v_old(#valid)_BEFORE_CALL_51| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_51| v_main_~a~0.base_BEFORE_CALL_28) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_51| 1) |v_old(#valid)_BEFORE_CALL_51|)) (not (= v_main_~a~0.base_BEFORE_CALL_28 |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_51| 0) 0) (not (= v_main_~a~0.base_BEFORE_CALL_28 2)) (= (select |v_old(#length)_BEFORE_CALL_51| 2) 10) (not (= v_main_~a~0.base_BEFORE_CALL_28 0)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_51| 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 09:06:02,141 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:06:02,141 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:06:02,142 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-04-01 09:06:02,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914770227] [2023-04-01 09:06:02,142 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:06:02,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 09:06:02,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:06:02,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 09:06:02,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=724, Unknown=1, NotChecked=0, Total=812 [2023-04-01 09:06:02,143 INFO L87 Difference]: Start difference. First operand 92 states and 104 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 09:06:02,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:06:02,356 INFO L93 Difference]: Finished difference Result 103 states and 117 transitions. [2023-04-01 09:06:02,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-01 09:06:02,357 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2023-04-01 09:06:02,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:06:02,358 INFO L225 Difference]: With dead ends: 103 [2023-04-01 09:06:02,358 INFO L226 Difference]: Without dead ends: 90 [2023-04-01 09:06:02,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 74 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=130, Invalid=991, Unknown=1, NotChecked=0, Total=1122 [2023-04-01 09:06:02,359 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 09:06:02,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 43 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 09:06:02,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-04-01 09:06:02,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 81. [2023-04-01 09:06:02,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 65 states have internal predecessors, (74), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-01 09:06:02,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 92 transitions. [2023-04-01 09:06:02,372 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 92 transitions. Word has length 35 [2023-04-01 09:06:02,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:06:02,372 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 92 transitions. [2023-04-01 09:06:02,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 09:06:02,373 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 92 transitions. [2023-04-01 09:06:02,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-04-01 09:06:02,375 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:06:02,375 INFO L195 NwaCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:06:02,383 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 09:06:02,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:06:02,581 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:06:02,581 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:06:02,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1793262381, now seen corresponding path program 7 times [2023-04-01 09:06:02,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:06:02,581 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [960959901] [2023-04-01 09:06:02,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:06:02,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:06:02,627 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:06:02,627 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1773212608] [2023-04-01 09:06:02,627 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 09:06:02,627 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:06:02,627 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:06:02,628 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 09:06:02,634 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 09:06:02,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:06:02,731 INFO L262 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 09:06:02,732 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:06:02,806 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 30 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-04-01 09:06:02,806 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:06:02,881 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 30 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-04-01 09:06:02,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:06:02,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [960959901] [2023-04-01 09:06:02,882 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:06:02,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773212608] [2023-04-01 09:06:02,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773212608] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:06:02,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1209722972] [2023-04-01 09:06:02,883 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 09:06:02,883 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:06:02,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:06:02,883 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:06:02,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:06:02,909 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:06:03,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 78 for LOIs [2023-04-01 09:06:03,709 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:06:03,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:06:03,717 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:06:04,754 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3988#(and (exists ((v_main_~c~0.base_BEFORE_CALL_31 Int)) (and (not (= v_main_~c~0.base_BEFORE_CALL_31 0)) (not (= |#StackHeapBarrier| v_main_~c~0.base_BEFORE_CALL_31)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_31) 0) ~N~0)))) (exists ((|v_old(#memory_int)_BEFORE_CALL_55| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_55| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_29 Int) (|v_old(#length)_BEFORE_CALL_55| (Array Int Int))) (and (not (= v_main_~a~0.base_BEFORE_CALL_29 3)) (= (select |v_old(#valid)_BEFORE_CALL_55| 2) 1) (not (= |v_old(#length)_BEFORE_CALL_55| (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (= 10 (select |v_old(#length)_BEFORE_CALL_55| 2)) (not (= v_main_~a~0.base_BEFORE_CALL_29 |#StackHeapBarrier|)) (not (= v_main_~a~0.base_BEFORE_CALL_29 1)) (= (select |v_old(#length)_BEFORE_CALL_55| 3) 12) (not (= |v_old(#valid)_BEFORE_CALL_55| |v_old(#length)_BEFORE_CALL_55|)) (= (select |v_old(#valid)_BEFORE_CALL_55| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_55| 1) 0) 48) (not (= |v_old(#valid)_BEFORE_CALL_55| (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (not (= v_main_~a~0.base_BEFORE_CALL_29 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_55| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_55| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_55| v_main_~a~0.base_BEFORE_CALL_29) 0) (not (= v_main_~a~0.base_BEFORE_CALL_29 2)) (= (select |v_old(#valid)_BEFORE_CALL_55| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_55| 3) 1))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (< 0 ~N~0) (= |#NULL.base| 0))' at error location [2023-04-01 09:06:04,754 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:06:04,754 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:06:04,754 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2023-04-01 09:06:04,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081764489] [2023-04-01 09:06:04,754 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:06:04,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-04-01 09:06:04,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:06:04,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-04-01 09:06:04,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=918, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 09:06:04,755 INFO L87 Difference]: Start difference. First operand 81 states and 92 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 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 09:06:05,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:06:05,204 INFO L93 Difference]: Finished difference Result 172 states and 204 transitions. [2023-04-01 09:06:05,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-01 09:06:05,204 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 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 34 [2023-04-01 09:06:05,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:06:05,205 INFO L225 Difference]: With dead ends: 172 [2023-04-01 09:06:05,205 INFO L226 Difference]: Without dead ends: 129 [2023-04-01 09:06:05,206 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=252, Invalid=1470, Unknown=0, NotChecked=0, Total=1722 [2023-04-01 09:06:05,207 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 68 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 09:06:05,207 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 77 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 09:06:05,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-04-01 09:06:05,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 112. [2023-04-01 09:06:05,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 87 states have (on average 1.1954022988505748) internal successors, (104), 91 states have internal predecessors, (104), 14 states have call successors, (14), 11 states have call predecessors, (14), 10 states have return successors, (11), 9 states have call predecessors, (11), 11 states have call successors, (11) [2023-04-01 09:06:05,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 129 transitions. [2023-04-01 09:06:05,227 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 129 transitions. Word has length 34 [2023-04-01 09:06:05,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:06:05,228 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 129 transitions. [2023-04-01 09:06:05,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 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 09:06:05,228 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 129 transitions. [2023-04-01 09:06:05,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-01 09:06:05,228 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:06:05,228 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:06:05,247 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 09:06:05,444 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-01 09:06:05,444 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:06:05,444 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:06:05,444 INFO L85 PathProgramCache]: Analyzing trace with hash -384649243, now seen corresponding path program 3 times [2023-04-01 09:06:05,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:06:05,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791354225] [2023-04-01 09:06:05,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:06:05,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:06:05,466 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:06:05,467 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [870270400] [2023-04-01 09:06:05,467 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 09:06:05,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:06:05,467 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:06:05,468 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:06:05,470 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 09:06:05,561 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 09:06:05,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:06:05,562 INFO L262 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 09:06:05,566 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:06:05,635 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-04-01 09:06:05,636 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:06:05,691 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 09:06:05,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:06:05,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791354225] [2023-04-01 09:06:05,691 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:06:05,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870270400] [2023-04-01 09:06:05,691 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870270400] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:06:05,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1287959345] [2023-04-01 09:06:05,693 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 09:06:05,693 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:06:05,693 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:06:05,693 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:06:05,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:06:05,721 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:06:07,186 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 97 for LOIs [2023-04-01 09:06:07,225 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:06:07,241 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:06:07,244 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:06:09,346 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4718#(and (exists ((|v_old(#length)_BEFORE_CALL_69| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_69| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_69| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_40 Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_69| 0) 0) (not (= v_main_~a~0.base_BEFORE_CALL_40 1)) (= (select |v_old(#valid)_BEFORE_CALL_69| v_main_~a~0.base_BEFORE_CALL_40) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_69| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_69| 3) 12) (not (= |v_old(#valid)_BEFORE_CALL_69| |v_old(#length)_BEFORE_CALL_69|)) (= (select |v_old(#valid)_BEFORE_CALL_69| 1) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_69| 1) |v_old(#length)_BEFORE_CALL_69|)) (= (select |v_old(#length)_BEFORE_CALL_69| 2) 10) (= (select |v_old(#valid)_BEFORE_CALL_69| 2) 1) (not (= v_main_~a~0.base_BEFORE_CALL_40 2)) (not (= |v_old(#valid)_BEFORE_CALL_69| (select |v_old(#memory_int)_BEFORE_CALL_69| 1))) (not (= v_main_~a~0.base_BEFORE_CALL_40 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_69| 1)) (= (select |v_old(#valid)_BEFORE_CALL_69| 3) 1) (not (= v_main_~a~0.base_BEFORE_CALL_40 |#StackHeapBarrier|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_69| 1) 0)) (not (= v_main_~a~0.base_BEFORE_CALL_40 3)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:06:09,347 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:06:09,347 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:06:09,347 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2023-04-01 09:06:09,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3038422] [2023-04-01 09:06:09,347 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:06:09,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-01 09:06:09,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:06:09,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-01 09:06:09,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=888, Unknown=0, NotChecked=0, Total=992 [2023-04-01 09:06:09,348 INFO L87 Difference]: Start difference. First operand 112 states and 129 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 09:06:09,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:06:09,712 INFO L93 Difference]: Finished difference Result 152 states and 171 transitions. [2023-04-01 09:06:09,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-01 09:06:09,712 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 36 [2023-04-01 09:06:09,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:06:09,713 INFO L225 Difference]: With dead ends: 152 [2023-04-01 09:06:09,713 INFO L226 Difference]: Without dead ends: 115 [2023-04-01 09:06:09,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 72 SyntacticMatches, 5 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=194, Invalid=1446, Unknown=0, NotChecked=0, Total=1640 [2023-04-01 09:06:09,714 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:06:09,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 91 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 09:06:09,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-04-01 09:06:09,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 101. [2023-04-01 09:06:09,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 80 states have (on average 1.15) internal successors, (92), 82 states have internal predecessors, (92), 12 states have call successors, (12), 10 states have call predecessors, (12), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 09:06:09,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 113 transitions. [2023-04-01 09:06:09,730 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 113 transitions. Word has length 36 [2023-04-01 09:06:09,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:06:09,730 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 113 transitions. [2023-04-01 09:06:09,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 15 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-04-01 09:06:09,730 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 113 transitions. [2023-04-01 09:06:09,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-01 09:06:09,731 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:06:09,731 INFO L195 NwaCegarLoop]: trace histogram [8, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:06:09,738 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-01 09:06:09,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-01 09:06:09,936 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:06:09,936 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:06:09,936 INFO L85 PathProgramCache]: Analyzing trace with hash -710028677, now seen corresponding path program 8 times [2023-04-01 09:06:09,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:06:09,936 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236467613] [2023-04-01 09:06:09,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:06:09,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:06:09,976 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:06:09,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1365798806] [2023-04-01 09:06:09,976 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 09:06:09,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:06:09,976 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:06:09,977 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:06:09,979 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-01 09:06:16,498 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-01 09:06:16,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 09:06:16,516 INFO L262 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-01 09:06:16,517 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:06:16,624 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 36 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 09:06:16,624 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:06:16,741 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 36 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 09:06:16,741 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:06:16,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236467613] [2023-04-01 09:06:16,741 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:06:16,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365798806] [2023-04-01 09:06:16,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365798806] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:06:16,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157552334] [2023-04-01 09:06:16,742 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-01 09:06:16,742 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:06:16,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:06:16,742 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:06:16,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:06:16,765 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:06:17,532 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 78 for LOIs [2023-04-01 09:06:17,551 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:06:17,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:06:17,558 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:06:18,657 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5411#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((v_main_~c~0.base_BEFORE_CALL_43 Int)) (and (not (= v_main_~c~0.base_BEFORE_CALL_43 0)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_43) 0) ~N~0)) (not (= |#StackHeapBarrier| v_main_~c~0.base_BEFORE_CALL_43)))) (= |#NULL.offset| 0) (< 0 ~N~0) (exists ((v_main_~a~0.base_BEFORE_CALL_41 Int) (|v_old(#length)_BEFORE_CALL_73| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_73| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_73| (Array Int Int))) (and (= (select |v_old(#valid)_BEFORE_CALL_73| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_73| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_73| |v_old(#length)_BEFORE_CALL_73|)) (= (select |v_old(#valid)_BEFORE_CALL_73| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_73| (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (not (= |v_old(#valid)_BEFORE_CALL_73| (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (= (select |v_old(#length)_BEFORE_CALL_73| 2) 10) (= (select |v_old(#valid)_BEFORE_CALL_73| 2) 1) (not (= v_main_~a~0.base_BEFORE_CALL_41 2)) (= (select |v_old(#length)_BEFORE_CALL_73| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_73| v_main_~a~0.base_BEFORE_CALL_41) 0) (not (= v_main_~a~0.base_BEFORE_CALL_41 3)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_73| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_73| 3) 12) (not (= v_main_~a~0.base_BEFORE_CALL_41 1)) (not (= v_main_~a~0.base_BEFORE_CALL_41 |#StackHeapBarrier|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_73| 1) 0)) (not (= v_main_~a~0.base_BEFORE_CALL_41 0)))) (= |#NULL.base| 0))' at error location [2023-04-01 09:06:18,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:06:18,657 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:06:18,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2023-04-01 09:06:18,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183449418] [2023-04-01 09:06:18,657 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:06:18,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-01 09:06:18,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:06:18,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-01 09:06:18,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1400, Unknown=0, NotChecked=0, Total=1640 [2023-04-01 09:06:18,659 INFO L87 Difference]: Start difference. First operand 101 states and 113 transitions. Second operand has 26 states, 26 states have (on average 1.4615384615384615) internal successors, (38), 26 states have internal predecessors, (38), 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 09:06:19,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:06:19,782 INFO L93 Difference]: Finished difference Result 272 states and 341 transitions. [2023-04-01 09:06:19,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-04-01 09:06:19,782 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.4615384615384615) internal successors, (38), 26 states have internal predecessors, (38), 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 36 [2023-04-01 09:06:19,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:06:19,785 INFO L225 Difference]: With dead ends: 272 [2023-04-01 09:06:19,786 INFO L226 Difference]: Without dead ends: 222 [2023-04-01 09:06:19,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 64 SyntacticMatches, 4 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=794, Invalid=4176, Unknown=0, NotChecked=0, Total=4970 [2023-04-01 09:06:19,788 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 113 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 504 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 871 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 504 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-01 09:06:19,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 70 Invalid, 871 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [504 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-01 09:06:19,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2023-04-01 09:06:19,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 171. [2023-04-01 09:06:19,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 142 states have (on average 1.2112676056338028) internal successors, (172), 146 states have internal predecessors, (172), 20 states have call successors, (20), 10 states have call predecessors, (20), 8 states have return successors, (16), 14 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-01 09:06:19,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 208 transitions. [2023-04-01 09:06:19,837 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 208 transitions. Word has length 36 [2023-04-01 09:06:19,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:06:19,837 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 208 transitions. [2023-04-01 09:06:19,837 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.4615384615384615) internal successors, (38), 26 states have internal predecessors, (38), 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 09:06:19,837 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 208 transitions. [2023-04-01 09:06:19,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 09:06:19,838 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:06:19,838 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:06:19,860 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-01 09:06:20,054 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-01 09:06:20,054 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:06:20,054 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:06:20,055 INFO L85 PathProgramCache]: Analyzing trace with hash -1110129228, now seen corresponding path program 4 times [2023-04-01 09:06:20,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:06:20,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430781856] [2023-04-01 09:06:20,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:06:20,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:06:20,083 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 09:06:20,083 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1728196921] [2023-04-01 09:06:20,083 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 09:06:20,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:06:20,083 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:06:20,084 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:06:20,085 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-01 09:06:21,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:06:21,463 INFO L262 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 66 conjunts are in the unsatisfiable core [2023-04-01 09:06:21,467 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:06:21,474 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 98 treesize of output 94 [2023-04-01 09:06:21,538 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 09:06:21,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 09:06:21,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 09:06:21,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 09:06:21,646 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 09:06:21,670 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 32 treesize of output 30 [2023-04-01 09:06:21,701 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 35 treesize of output 40 [2023-04-01 09:06:21,733 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 35 treesize of output 40 [2023-04-01 09:06:21,908 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 31 treesize of output 15 [2023-04-01 09:06:21,950 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 09:06:21,950 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:06:22,172 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 5 [2023-04-01 09:06:23,884 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:06:23,884 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 30 [2023-04-01 09:06:24,347 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:06:24,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 41 treesize of output 38 [2023-04-01 09:06:25,270 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:06:25,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 37 treesize of output 51 [2023-04-01 09:06:25,294 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 09:06:25,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 9 treesize of output 8 [2023-04-01 09:06:25,339 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 2776 treesize of output 2750 [2023-04-01 09:06:25,399 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 225 treesize of output 221 [2023-04-01 09:06:25,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 33 [2023-04-01 09:06:25,590 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 09:06:25,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:06:25,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430781856] [2023-04-01 09:06:25,590 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 09:06:25,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728196921] [2023-04-01 09:06:25,591 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728196921] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:06:25,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [38072909] [2023-04-01 09:06:25,591 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-01 09:06:25,592 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:06:25,592 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:06:25,592 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:06:25,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:06:25,613 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 09:06:27,047 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 97 for LOIs [2023-04-01 09:06:27,088 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 58 for LOIs [2023-04-01 09:06:27,092 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 09:06:27,095 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 09:06:29,066 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6516#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_87| (Array Int (Array Int Int))) (v_main_~a~0.base_BEFORE_CALL_52 Int) (|v_old(#valid)_BEFORE_CALL_87| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_87| (Array Int Int))) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_87| 1) 1) 0) (not (= v_main_~a~0.base_BEFORE_CALL_52 0)) (not (= |v_old(#length)_BEFORE_CALL_87| (select |v_old(#memory_int)_BEFORE_CALL_87| 1))) (not (= |v_old(#valid)_BEFORE_CALL_87| |v_old(#length)_BEFORE_CALL_87|)) (not (= v_main_~a~0.base_BEFORE_CALL_52 |#StackHeapBarrier|)) (= 2 (select |v_old(#length)_BEFORE_CALL_87| 1)) (= (select |v_old(#valid)_BEFORE_CALL_87| 0) 0) (= (select |v_old(#length)_BEFORE_CALL_87| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_87| v_main_~a~0.base_BEFORE_CALL_52) 0) (= (select |v_old(#valid)_BEFORE_CALL_87| 2) 1) (not (= |v_old(#valid)_BEFORE_CALL_87| (select |v_old(#memory_int)_BEFORE_CALL_87| 1))) (= (select |v_old(#valid)_BEFORE_CALL_87| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_87| 2) 10) (not (= v_main_~a~0.base_BEFORE_CALL_52 2)) (not (= v_main_~a~0.base_BEFORE_CALL_52 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_87| 1) 0) 48) (not (= v_main_~a~0.base_BEFORE_CALL_52 3)) (= (select |v_old(#valid)_BEFORE_CALL_87| 1) 1))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 09:06:29,066 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 09:06:29,066 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:06:29,067 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 37 [2023-04-01 09:06:29,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626899538] [2023-04-01 09:06:29,067 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 09:06:29,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-04-01 09:06:29,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:06:29,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-04-01 09:06:29,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2648, Unknown=0, NotChecked=0, Total=2862 [2023-04-01 09:06:29,068 INFO L87 Difference]: Start difference. First operand 171 states and 208 transitions. Second operand has 37 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4)