/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain EqDomain -i ../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 08:56:21,264 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 08:56:21,265 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 08:56:21,290 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 08:56:21,290 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 08:56:21,291 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 08:56:21,292 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 08:56:21,293 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 08:56:21,294 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 08:56:21,294 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 08:56:21,295 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 08:56:21,296 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 08:56:21,296 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 08:56:21,302 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 08:56:21,304 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 08:56:21,307 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 08:56:21,308 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 08:56:21,311 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 08:56:21,314 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 08:56:21,318 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 08:56:21,319 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 08:56:21,321 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 08:56:21,322 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 08:56:21,323 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 08:56:21,329 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 08:56:21,329 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 08:56:21,329 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 08:56:21,330 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 08:56:21,330 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 08:56:21,331 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 08:56:21,331 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 08:56:21,331 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 08:56:21,332 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 08:56:21,332 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 08:56:21,333 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 08:56:21,333 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 08:56:21,333 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 08:56:21,333 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 08:56:21,334 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 08:56:21,334 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 08:56:21,334 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 08:56:21,335 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 08:56:21,356 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 08:56:21,356 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 08:56:21,357 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 08:56:21,357 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 08:56:21,358 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 08:56:21,358 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 08:56:21,358 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 08:56:21,358 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 08:56:21,358 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 08:56:21,358 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 08:56:21,359 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 08:56:21,359 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 08:56:21,359 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 08:56:21,359 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 08:56:21,359 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 08:56:21,359 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 08:56:21,359 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 08:56:21,359 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 08:56:21,360 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 08:56:21,360 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 08:56:21,360 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 08:56:21,360 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 08:56:21,360 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 08:56:21,360 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 08:56:21,360 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 08:56:21,360 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 08:56:21,361 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:56:21,361 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 08:56:21,361 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 08:56:21,362 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 08:56:21,362 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 08:56:21,362 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 08:56:21,362 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 08:56:21,362 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 08:56:21,533 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 08:56:21,551 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 08:56:21,553 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 08:56:21,554 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 08:56:21,554 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 08:56:21,555 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c [2023-04-01 08:56:22,537 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 08:56:22,745 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 08:56:22,745 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c [2023-04-01 08:56:22,750 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a6fdde8f3/01688be6a0e442fcb911e36e81ba885a/FLAG694fd2e3e [2023-04-01 08:56:23,157 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a6fdde8f3/01688be6a0e442fcb911e36e81ba885a [2023-04-01 08:56:23,161 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 08:56:23,162 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 08:56:23,163 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 08:56:23,163 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 08:56:23,165 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 08:56:23,166 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,167 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@704fb949 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23, skipping insertion in model container [2023-04-01 08:56:23,167 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,171 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 08:56:23,181 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 08:56:23,266 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c[408,421] [2023-04-01 08:56:23,278 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:56:23,287 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 08:56:23,294 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c[408,421] [2023-04-01 08:56:23,310 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:56:23,319 INFO L208 MainTranslator]: Completed translation [2023-04-01 08:56:23,319 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23 WrapperNode [2023-04-01 08:56:23,320 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 08:56:23,320 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 08:56:23,320 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 08:56:23,321 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 08:56:23,328 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,329 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,341 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,342 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,346 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,350 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,351 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,351 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,353 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 08:56:23,353 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 08:56:23,353 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 08:56:23,353 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 08:56:23,355 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (1/1) ... [2023-04-01 08:56:23,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:56:23,367 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:23,378 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 08:56:23,380 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 08:56:23,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 08:56:23,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 08:56:23,402 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 08:56:23,402 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 08:56:23,402 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 08:56:23,402 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 08:56:23,402 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 08:56:23,402 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 08:56:23,403 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 08:56:23,404 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 08:56:23,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 08:56:23,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 08:56:23,452 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 08:56:23,453 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 08:56:23,669 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 08:56:23,727 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 08:56:23,727 INFO L302 CfgBuilder]: Removed 7 assume(true) statements. [2023-04-01 08:56:23,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:56:23 BoogieIcfgContainer [2023-04-01 08:56:23,730 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 08:56:23,731 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 08:56:23,731 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 08:56:23,733 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 08:56:23,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 08:56:23" (1/3) ... [2023-04-01 08:56:23,734 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b30432c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:56:23, skipping insertion in model container [2023-04-01 08:56:23,734 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:23" (2/3) ... [2023-04-01 08:56:23,734 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b30432c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:56:23, skipping insertion in model container [2023-04-01 08:56:23,734 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:56:23" (3/3) ... [2023-04-01 08:56:23,735 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m3.c [2023-04-01 08:56:23,747 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 08:56:23,748 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 08:56:23,788 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 08:56:23,795 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;@61c63726, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 08:56:23,795 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 08:56:23,798 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.625) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:56:23,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 08:56:23,803 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:23,804 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:23,804 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:23,809 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:23,810 INFO L85 PathProgramCache]: Analyzing trace with hash -2118691936, now seen corresponding path program 1 times [2023-04-01 08:56:23,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:23,817 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369450157] [2023-04-01 08:56:23,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:23,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:23,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:24,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:24,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:24,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369450157] [2023-04-01 08:56:24,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369450157] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:56:24,053 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:56:24,053 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 08:56:24,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749080749] [2023-04-01 08:56:24,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:56:24,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:56:24,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:24,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:56:24,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:56:24,077 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.625) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:24,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:24,123 INFO L93 Difference]: Finished difference Result 42 states and 58 transitions. [2023-04-01 08:56:24,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:56:24,125 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2023-04-01 08:56:24,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:24,129 INFO L225 Difference]: With dead ends: 42 [2023-04-01 08:56:24,129 INFO L226 Difference]: Without dead ends: 19 [2023-04-01 08:56:24,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:56:24,133 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:24,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:24,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-04-01 08:56:24,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-04-01 08:56:24,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:24,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2023-04-01 08:56:24,156 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 17 [2023-04-01 08:56:24,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:24,157 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2023-04-01 08:56:24,157 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:24,157 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2023-04-01 08:56:24,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 08:56:24,158 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:24,158 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:24,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 08:56:24,158 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:24,158 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:24,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1645761360, now seen corresponding path program 1 times [2023-04-01 08:56:24,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:24,159 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473672246] [2023-04-01 08:56:24,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:24,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:24,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:24,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 08:56:24,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:24,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473672246] [2023-04-01 08:56:24,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473672246] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:56:24,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:56:24,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 08:56:24,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922404333] [2023-04-01 08:56:24,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:56:24,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 08:56:24,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:24,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 08:56:24,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 08:56:24,251 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:24,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:24,302 INFO L93 Difference]: Finished difference Result 35 states and 51 transitions. [2023-04-01 08:56:24,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 08:56:24,302 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-04-01 08:56:24,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:24,304 INFO L225 Difference]: With dead ends: 35 [2023-04-01 08:56:24,304 INFO L226 Difference]: Without dead ends: 25 [2023-04-01 08:56:24,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 08:56:24,312 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 17 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:24,313 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 18 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:24,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-04-01 08:56:24,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-04-01 08:56:24,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:24,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2023-04-01 08:56:24,318 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 18 [2023-04-01 08:56:24,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:24,318 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2023-04-01 08:56:24,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:24,318 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2023-04-01 08:56:24,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-04-01 08:56:24,319 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:24,319 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:24,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 08:56:24,319 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:24,320 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:24,320 INFO L85 PathProgramCache]: Analyzing trace with hash -1698536017, now seen corresponding path program 1 times [2023-04-01 08:56:24,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:24,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822019635] [2023-04-01 08:56:24,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:24,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:24,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:24,488 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:24,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:24,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822019635] [2023-04-01 08:56:24,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822019635] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:24,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517819207] [2023-04-01 08:56:24,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:24,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:24,490 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:24,493 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:24,511 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 08:56:24,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:24,573 INFO L262 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:56:24,578 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:24,640 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:24,640 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:24,672 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:24,673 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517819207] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:24,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635112411] [2023-04-01 08:56:24,714 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:24,714 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:24,719 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:24,723 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:24,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:24,880 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:56:26,044 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:56:26,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:56:26,085 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:26,726 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '386#(and (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((v_main_~a~0.base_BEFORE_CALL_1 Int) (|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_1| (Array Int Int))) (and (= (select |v_old(#valid)_BEFORE_CALL_1| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_1| |v_old(#length)_BEFORE_CALL_1|)) (= (select |v_old(#length)_BEFORE_CALL_1| 3) 12) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#valid)_BEFORE_CALL_1|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_1| 1) 1) (not (= v_main_~a~0.base_BEFORE_CALL_1 0)) (not (= v_main_~a~0.base_BEFORE_CALL_1 3)) (= (select |v_old(#valid)_BEFORE_CALL_1| v_main_~a~0.base_BEFORE_CALL_1) 0) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= v_main_~a~0.base_BEFORE_CALL_1 1)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (not (= v_main_~a~0.base_BEFORE_CALL_1 |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_1| 2) 20) (not (= v_main_~a~0.base_BEFORE_CALL_1 2)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:26,727 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:26,727 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:26,727 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 08:56:26,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22726568] [2023-04-01 08:56:26,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:26,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 08:56:26,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:26,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 08:56:26,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:56:26,729 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:26,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:26,775 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2023-04-01 08:56:26,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 08:56:26,775 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-04-01 08:56:26,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:26,777 INFO L225 Difference]: With dead ends: 43 [2023-04-01 08:56:26,777 INFO L226 Difference]: Without dead ends: 26 [2023-04-01 08:56:26,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:56:26,781 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:26,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:26,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-01 08:56:26,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-04-01 08:56:26,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:26,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2023-04-01 08:56:26,791 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 24 [2023-04-01 08:56:26,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:26,791 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2023-04-01 08:56:26,791 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:26,791 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2023-04-01 08:56:26,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 08:56:26,792 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:26,792 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:26,803 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 08:56:26,999 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:26,999 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:27,000 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:27,000 INFO L85 PathProgramCache]: Analyzing trace with hash 1155751935, now seen corresponding path program 2 times [2023-04-01 08:56:27,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:27,000 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492203482] [2023-04-01 08:56:27,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:27,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:27,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:27,088 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:56:27,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:27,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492203482] [2023-04-01 08:56:27,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492203482] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:27,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247336986] [2023-04-01 08:56:27,088 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:27,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:27,089 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:27,093 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:27,095 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 08:56:27,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 08:56:27,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:27,144 INFO L262 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:56:27,145 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:27,173 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:56:27,173 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:27,197 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-04-01 08:56:27,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247336986] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:27,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [830809418] [2023-04-01 08:56:27,199 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:27,200 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:27,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:27,200 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:27,200 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:27,240 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:56:27,822 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:56:27,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:56:27,843 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:28,408 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '677#(and (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((v_main_~a~0.base_BEFORE_CALL_2 Int) (|v_old(#valid)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_2| (Array Int (Array Int Int)))) (and (not (= v_main_~a~0.base_BEFORE_CALL_2 1)) (= (select |v_old(#valid)_BEFORE_CALL_2| v_main_~a~0.base_BEFORE_CALL_2) 0) (= 2 (select |v_old(#length)_BEFORE_CALL_2| 1)) (not (= v_main_~a~0.base_BEFORE_CALL_2 0)) (= (select |v_old(#length)_BEFORE_CALL_2| 3) 12) (= (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_2| 0) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 0)) (not (= |v_old(#length)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| |v_old(#length)_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 2) 1) (not (= v_main_~a~0.base_BEFORE_CALL_2 3)) (= (select |v_old(#length)_BEFORE_CALL_2| 2) 20) (not (= v_main_~a~0.base_BEFORE_CALL_2 |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 3) 1) (not (= v_main_~a~0.base_BEFORE_CALL_2 2)) (= (select |v_old(#valid)_BEFORE_CALL_2| 1) 1))) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:28,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:28,408 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:28,408 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-04-01 08:56:28,409 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858761406] [2023-04-01 08:56:28,409 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:28,409 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 08:56:28,409 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:28,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 08:56:28,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-04-01 08:56:28,410 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:28,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:28,450 INFO L93 Difference]: Finished difference Result 47 states and 63 transitions. [2023-04-01 08:56:28,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 08:56:28,450 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-04-01 08:56:28,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:28,451 INFO L225 Difference]: With dead ends: 47 [2023-04-01 08:56:28,451 INFO L226 Difference]: Without dead ends: 32 [2023-04-01 08:56:28,451 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-04-01 08:56:28,452 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:28,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 18 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:28,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-04-01 08:56:28,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-04-01 08:56:28,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:28,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2023-04-01 08:56:28,455 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 25 [2023-04-01 08:56:28,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:28,455 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2023-04-01 08:56:28,456 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:28,456 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2023-04-01 08:56:28,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-01 08:56:28,456 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:28,456 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:28,463 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-01 08:56:28,656 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-04-01 08:56:28,657 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:28,657 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:28,657 INFO L85 PathProgramCache]: Analyzing trace with hash -516446464, now seen corresponding path program 3 times [2023-04-01 08:56:28,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:28,658 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882510794] [2023-04-01 08:56:28,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:28,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:28,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:30,139 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:30,140 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:30,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882510794] [2023-04-01 08:56:30,140 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882510794] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:30,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260733248] [2023-04-01 08:56:30,140 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:30,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:30,140 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:30,142 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:30,144 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 08:56:30,195 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:30,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:30,197 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 58 conjunts are in the unsatisfiable core [2023-04-01 08:56:30,199 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:30,678 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 08:56:30,678 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:31,297 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:56:31,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 43 [2023-04-01 08:56:31,372 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 08:56:31,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260733248] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:31,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027202895] [2023-04-01 08:56:31,374 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:31,374 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:31,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:31,375 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:31,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:31,409 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:56:32,012 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:56:32,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:56:32,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:33,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1067#(and (= ~MAX~0 100000) (exists ((|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))) (v_main_~a~0.base_BEFORE_CALL_3 Int)) (and (not (= v_main_~a~0.base_BEFORE_CALL_3 1)) (= (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| v_main_~a~0.base_BEFORE_CALL_3) 0) (= (select |v_old(#valid)_BEFORE_CALL_3| 0) 0) (not (= v_main_~a~0.base_BEFORE_CALL_3 2)) (= (select |v_old(#length)_BEFORE_CALL_3| 2) 20) (not (= |v_old(#valid)_BEFORE_CALL_3| |v_old(#length)_BEFORE_CALL_3|)) (not (= v_main_~a~0.base_BEFORE_CALL_3 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))) (not (= v_main_~a~0.base_BEFORE_CALL_3 |#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) (not (= v_main_~a~0.base_BEFORE_CALL_3 0)) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 3) 1))) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:33,166 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:33,166 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:33,166 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19, 20] total 51 [2023-04-01 08:56:33,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892333409] [2023-04-01 08:56:33,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:33,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-04-01 08:56:33,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:33,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-04-01 08:56:33,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=3586, Unknown=0, NotChecked=0, Total=3782 [2023-04-01 08:56:33,169 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 49 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:33,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:33,869 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2023-04-01 08:56:33,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-01 08:56:33,869 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 49 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2023-04-01 08:56:33,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:33,870 INFO L225 Difference]: With dead ends: 53 [2023-04-01 08:56:33,870 INFO L226 Difference]: Without dead ends: 48 [2023-04-01 08:56:33,871 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1139 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=232, Invalid=4460, Unknown=0, NotChecked=0, Total=4692 [2023-04-01 08:56:33,872 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 895 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:33,872 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 171 Invalid, 897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 895 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 08:56:33,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-04-01 08:56:33,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2023-04-01 08:56:33,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 41 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:33,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2023-04-01 08:56:33,877 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 31 [2023-04-01 08:56:33,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:33,878 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2023-04-01 08:56:33,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 49 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:33,878 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2023-04-01 08:56:33,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-01 08:56:33,878 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:33,878 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:33,885 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:34,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:34,085 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:34,085 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:34,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1859234359, now seen corresponding path program 4 times [2023-04-01 08:56:34,086 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:34,086 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507641977] [2023-04-01 08:56:34,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:34,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:34,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:34,151 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:56:34,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:34,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507641977] [2023-04-01 08:56:34,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507641977] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:34,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843124752] [2023-04-01 08:56:34,151 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:56:34,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:34,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:34,153 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:34,155 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 08:56:34,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:34,202 INFO L262 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:56:34,204 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:34,240 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:56:34,240 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:34,272 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:56:34,273 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843124752] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:34,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [801595072] [2023-04-01 08:56:34,274 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:34,274 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:34,274 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:34,274 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:34,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:34,318 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:56:34,842 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:56:34,859 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:56:34,862 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:35,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1480#(and (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_old(#memory_int)_BEFORE_CALL_4| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_4| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_4| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_4 Int)) (and (= (select |v_old(#length)_BEFORE_CALL_4| 1) 2) (not (= v_main_~a~0.base_BEFORE_CALL_4 1)) (= (select |v_old(#valid)_BEFORE_CALL_4| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_4| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_4| |v_old(#length)_BEFORE_CALL_4|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_4| 1) |v_old(#length)_BEFORE_CALL_4|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_4| v_main_~a~0.base_BEFORE_CALL_4) 0) (not (= v_main_~a~0.base_BEFORE_CALL_4 0)) (= (select |v_old(#valid)_BEFORE_CALL_4| 3) 1) (not (= v_main_~a~0.base_BEFORE_CALL_4 3)) (= (select |v_old(#length)_BEFORE_CALL_4| 3) 12) (not (= v_main_~a~0.base_BEFORE_CALL_4 2)) (not (= |v_old(#valid)_BEFORE_CALL_4| (select |v_old(#memory_int)_BEFORE_CALL_4| 1))) (= (select |v_old(#length)_BEFORE_CALL_4| 2) 20) (= (select |v_old(#valid)_BEFORE_CALL_4| 2) 1) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 0)) (not (= v_main_~a~0.base_BEFORE_CALL_4 |#StackHeapBarrier|)))) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:35,443 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:35,443 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:35,443 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-01 08:56:35,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387381590] [2023-04-01 08:56:35,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:35,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 08:56:35,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:35,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 08:56:35,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2023-04-01 08:56:35,445 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:35,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:35,611 INFO L93 Difference]: Finished difference Result 96 states and 122 transitions. [2023-04-01 08:56:35,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-01 08:56:35,612 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2023-04-01 08:56:35,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:35,613 INFO L225 Difference]: With dead ends: 96 [2023-04-01 08:56:35,613 INFO L226 Difference]: Without dead ends: 57 [2023-04-01 08:56:35,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 76 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=116, Invalid=640, Unknown=0, NotChecked=0, Total=756 [2023-04-01 08:56:35,616 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 21 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:35,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 36 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:35,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-04-01 08:56:35,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 50. [2023-04-01 08:56:35,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 45 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:35,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2023-04-01 08:56:35,626 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 32 [2023-04-01 08:56:35,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:35,626 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2023-04-01 08:56:35,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:35,626 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2023-04-01 08:56:35,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-01 08:56:35,627 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:35,627 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:35,633 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-01 08:56:35,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:35,828 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:35,828 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:35,828 INFO L85 PathProgramCache]: Analyzing trace with hash -735531899, now seen corresponding path program 5 times [2023-04-01 08:56:35,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:35,828 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510720778] [2023-04-01 08:56:35,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:35,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:35,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:35,893 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:35,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:35,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510720778] [2023-04-01 08:56:35,893 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [510720778] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:35,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482874257] [2023-04-01 08:56:35,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:35,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:35,893 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:35,894 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:35,896 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 08:56:35,944 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:56:35,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:35,945 INFO L262 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:56:35,946 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:35,986 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:35,986 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:36,027 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:36,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482874257] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:36,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [475486350] [2023-04-01 08:56:36,029 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:36,029 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:36,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:36,029 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:36,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:36,056 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:56:36,536 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:56:36,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:56:36,558 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:37,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1982#(and (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#memory_int)_BEFORE_CALL_5| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_5| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_5| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_5 Int)) (and (not (= |v_old(#valid)_BEFORE_CALL_5| (select |v_old(#memory_int)_BEFORE_CALL_5| 1))) (not (= v_main_~a~0.base_BEFORE_CALL_5 0)) (= (select |v_old(#valid)_BEFORE_CALL_5| 1) 1) (not (= v_main_~a~0.base_BEFORE_CALL_5 1)) (= (select |v_old(#valid)_BEFORE_CALL_5| v_main_~a~0.base_BEFORE_CALL_5) 0) (not (= v_main_~a~0.base_BEFORE_CALL_5 2)) (= (select |v_old(#length)_BEFORE_CALL_5| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_5| 2) 1) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 1) 0) (= 20 (select |v_old(#length)_BEFORE_CALL_5| 2)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_5| 1) |v_old(#length)_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| 0) 0) (not (= v_main_~a~0.base_BEFORE_CALL_5 |#StackHeapBarrier|)) (not (= v_main_~a~0.base_BEFORE_CALL_5 3)) (= (select |v_old(#valid)_BEFORE_CALL_5| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_5| |v_old(#length)_BEFORE_CALL_5|)) (= 2 (select |v_old(#length)_BEFORE_CALL_5| 1)))) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:37,145 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:37,145 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:37,145 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-01 08:56:37,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609460176] [2023-04-01 08:56:37,146 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:37,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 08:56:37,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:37,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 08:56:37,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=517, Unknown=0, NotChecked=0, Total=600 [2023-04-01 08:56:37,147 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:37,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:37,333 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2023-04-01 08:56:37,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 08:56:37,333 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2023-04-01 08:56:37,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:37,334 INFO L225 Difference]: With dead ends: 56 [2023-04-01 08:56:37,334 INFO L226 Difference]: Without dead ends: 39 [2023-04-01 08:56:37,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 78 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2023-04-01 08:56:37,335 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:37,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 60 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:37,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-04-01 08:56:37,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-04-01 08:56:37,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:37,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2023-04-01 08:56:37,342 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 33 [2023-04-01 08:56:37,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:37,343 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2023-04-01 08:56:37,343 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:37,343 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2023-04-01 08:56:37,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-01 08:56:37,345 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:37,345 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:37,350 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 08:56:37,550 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:37,550 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:37,551 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:37,551 INFO L85 PathProgramCache]: Analyzing trace with hash -604384305, now seen corresponding path program 6 times [2023-04-01 08:56:37,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:37,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56288352] [2023-04-01 08:56:37,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:37,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:37,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:39,574 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:39,574 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:39,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56288352] [2023-04-01 08:56:39,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56288352] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:39,575 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596329294] [2023-04-01 08:56:39,575 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:39,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:39,575 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:39,576 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:39,578 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 08:56:39,634 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:39,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:39,636 INFO L262 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 88 conjunts are in the unsatisfiable core [2023-04-01 08:56:39,638 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:40,621 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 3 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 08:56:40,621 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:42,009 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:56:42,009 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 89 [2023-04-01 08:56:42,267 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 08:56:42,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596329294] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:42,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [322006068] [2023-04-01 08:56:42,268 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:42,268 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:42,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:42,268 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:42,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:42,314 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:56:42,779 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:56:42,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:56:42,798 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:44,060 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2483#(and (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#valid)_BEFORE_CALL_6| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_6| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_6| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_6 Int)) (and (not (= v_main_~a~0.base_BEFORE_CALL_6 |#StackHeapBarrier|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_6| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_6| 3) 12) (not (= |v_old(#valid)_BEFORE_CALL_6| |v_old(#length)_BEFORE_CALL_6|)) (not (= v_main_~a~0.base_BEFORE_CALL_6 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 0) 48) (= 20 (select |v_old(#length)_BEFORE_CALL_6| 2)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_6| 1) |v_old(#length)_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_6| v_main_~a~0.base_BEFORE_CALL_6) 0) (= (select |v_old(#length)_BEFORE_CALL_6| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_6| (select |v_old(#memory_int)_BEFORE_CALL_6| 1))) (not (= 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_6| 1) 1) (not (= v_main_~a~0.base_BEFORE_CALL_6 3)) (= (select |v_old(#valid)_BEFORE_CALL_6| 0) 0))) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:44,061 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:44,061 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:44,061 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 27, 28] total 78 [2023-04-01 08:56:44,061 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364226360] [2023-04-01 08:56:44,061 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:44,061 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2023-04-01 08:56:44,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:44,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2023-04-01 08:56:44,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=7513, Unknown=0, NotChecked=0, Total=7832 [2023-04-01 08:56:44,064 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 78 states, 78 states have (on average 1.1538461538461537) internal successors, (90), 76 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:49,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:49,829 INFO L93 Difference]: Finished difference Result 120 states and 145 transitions. [2023-04-01 08:56:49,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-04-01 08:56:49,831 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.1538461538461537) internal successors, (90), 76 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2023-04-01 08:56:49,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:49,832 INFO L225 Difference]: With dead ends: 120 [2023-04-01 08:56:49,832 INFO L226 Difference]: Without dead ends: 100 [2023-04-01 08:56:49,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3779 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=1125, Invalid=17507, Unknown=0, NotChecked=0, Total=18632 [2023-04-01 08:56:49,836 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 74 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 2586 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 2964 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 2586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:49,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 292 Invalid, 2964 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 2586 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-04-01 08:56:49,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-04-01 08:56:49,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 65. [2023-04-01 08:56:49,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.25) internal successors, (75), 60 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:49,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 79 transitions. [2023-04-01 08:56:49,855 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 79 transitions. Word has length 38 [2023-04-01 08:56:49,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:49,855 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 79 transitions. [2023-04-01 08:56:49,856 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 1.1538461538461537) internal successors, (90), 76 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:49,856 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 79 transitions. [2023-04-01 08:56:49,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 08:56:49,861 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:49,861 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:49,868 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:50,065 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:50,066 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:50,066 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:50,066 INFO L85 PathProgramCache]: Analyzing trace with hash -1399520002, now seen corresponding path program 7 times [2023-04-01 08:56:50,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:50,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431992517] [2023-04-01 08:56:50,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:50,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:50,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:50,157 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:56:50,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:50,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431992517] [2023-04-01 08:56:50,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431992517] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:50,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547422647] [2023-04-01 08:56:50,157 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:56:50,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:50,158 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:50,158 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:50,160 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 08:56:50,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:50,216 INFO L262 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 08:56:50,220 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:50,291 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:56:50,291 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:50,339 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:56:50,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547422647] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:50,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738740585] [2023-04-01 08:56:50,341 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:50,341 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:50,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:50,342 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:50,342 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:50,365 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:56:50,837 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:56:50,856 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:56:50,859 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:51,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3191#(and (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (exists ((|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)) (v_main_~a~0.base_BEFORE_CALL_7 Int)) (and (= (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) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 1) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_7| 3) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#valid)_BEFORE_CALL_7|)) (= 2 (select |v_old(#length)_BEFORE_CALL_7| 1)) (= (select |v_old(#valid)_BEFORE_CALL_7| v_main_~a~0.base_BEFORE_CALL_7) 0) (not (= v_main_~a~0.base_BEFORE_CALL_7 3)) (not (= v_main_~a~0.base_BEFORE_CALL_7 1)) (= 20 (select |v_old(#length)_BEFORE_CALL_7| 2)) (= (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_7 2)) (not (= v_main_~a~0.base_BEFORE_CALL_7 0)) (not (= v_main_~a~0.base_BEFORE_CALL_7 |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_7| |v_old(#length)_BEFORE_CALL_7|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:51,436 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:51,437 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:51,437 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-04-01 08:56:51,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807335853] [2023-04-01 08:56:51,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:51,437 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 08:56:51,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:51,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 08:56:51,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=644, Unknown=0, NotChecked=0, Total=756 [2023-04-01 08:56:51,438 INFO L87 Difference]: Start difference. First operand 65 states and 79 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:51,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:51,616 INFO L93 Difference]: Finished difference Result 126 states and 153 transitions. [2023-04-01 08:56:51,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 08:56:51,617 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2023-04-01 08:56:51,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:51,617 INFO L225 Difference]: With dead ends: 126 [2023-04-01 08:56:51,617 INFO L226 Difference]: Without dead ends: 60 [2023-04-01 08:56:51,618 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 94 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=154, Invalid=838, Unknown=0, NotChecked=0, Total=992 [2023-04-01 08:56:51,618 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 23 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:51,618 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 44 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:51,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-01 08:56:51,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 53. [2023-04-01 08:56:51,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:51,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2023-04-01 08:56:51,627 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 39 [2023-04-01 08:56:51,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:51,627 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2023-04-01 08:56:51,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:51,628 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2023-04-01 08:56:51,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-01 08:56:51,628 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:51,628 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:51,635 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:51,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:51,833 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:51,833 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:51,833 INFO L85 PathProgramCache]: Analyzing trace with hash 2073383490, now seen corresponding path program 8 times [2023-04-01 08:56:51,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:51,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776115233] [2023-04-01 08:56:51,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:51,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:51,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:51,934 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-04-01 08:56:51,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:51,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776115233] [2023-04-01 08:56:51,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [776115233] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:51,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513241610] [2023-04-01 08:56:51,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:51,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:51,935 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:51,936 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:51,938 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 08:56:51,996 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:56:51,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:51,997 INFO L262 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 08:56:51,998 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:52,068 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-04-01 08:56:52,068 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:52,143 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-04-01 08:56:52,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513241610] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:52,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [817723010] [2023-04-01 08:56:52,145 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:56:52,146 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:52,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:52,146 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:52,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:52,172 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:56:52,644 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:56:52,663 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:56:52,666 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:53,233 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3818#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_8| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_8| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_8 Int) (|v_old(#length)_BEFORE_CALL_8| (Array Int Int))) (and (not (= v_main_~a~0.base_BEFORE_CALL_8 3)) (not (= |v_old(#valid)_BEFORE_CALL_8| |v_old(#length)_BEFORE_CALL_8|)) (not (= v_main_~a~0.base_BEFORE_CALL_8 |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_8| v_main_~a~0.base_BEFORE_CALL_8) 0) (= 12 (select |v_old(#length)_BEFORE_CALL_8| 3)) (not (= |v_old(#length)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (not (= v_main_~a~0.base_BEFORE_CALL_8 0)) (not (= v_main_~a~0.base_BEFORE_CALL_8 2)) (= (select |v_old(#valid)_BEFORE_CALL_8| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_8| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_8| 0) 0) (= 20 (select |v_old(#length)_BEFORE_CALL_8| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 0) 48) (not (= |v_old(#valid)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 1) 0) (not (= v_main_~a~0.base_BEFORE_CALL_8 1)) (= (select |v_old(#valid)_BEFORE_CALL_8| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_8| 2) 1))) (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:53,233 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:53,233 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:53,233 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-04-01 08:56:53,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218823898] [2023-04-01 08:56:53,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:53,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 08:56:53,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:53,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 08:56:53,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=651, Unknown=0, NotChecked=0, Total=756 [2023-04-01 08:56:53,234 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:53,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:53,403 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2023-04-01 08:56:53,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 08:56:53,403 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2023-04-01 08:56:53,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:53,404 INFO L225 Difference]: With dead ends: 59 [2023-04-01 08:56:53,404 INFO L226 Difference]: Without dead ends: 46 [2023-04-01 08:56:53,404 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 106 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=158, Invalid=964, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 08:56:53,405 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 8 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:53,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 32 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:53,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-01 08:56:53,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-04-01 08:56:53,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:53,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2023-04-01 08:56:53,412 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 42 [2023-04-01 08:56:53,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:53,412 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2023-04-01 08:56:53,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.823529411764706) internal successors, (48), 17 states have internal predecessors, (48), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:53,412 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2023-04-01 08:56:53,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 08:56:53,413 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:53,413 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:53,424 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:53,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-01 08:56:53,618 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:53,618 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:53,618 INFO L85 PathProgramCache]: Analyzing trace with hash 465085024, now seen corresponding path program 9 times [2023-04-01 08:56:53,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:53,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212702302] [2023-04-01 08:56:53,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:53,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:53,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:56,506 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 1 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:56,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:56,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212702302] [2023-04-01 08:56:56,506 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212702302] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:56,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1334006533] [2023-04-01 08:56:56,506 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:56,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:56,506 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:56,507 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:56,508 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 08:56:56,570 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:56,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:56,572 INFO L262 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 108 conjunts are in the unsatisfiable core [2023-04-01 08:56:56,574 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:57,887 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:56:57,887 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:59,911 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:56:59,912 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 153 [2023-04-01 08:57:00,359 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:57:00,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1334006533] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:00,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [261884198] [2023-04-01 08:57:00,360 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:00,360 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:00,360 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:00,360 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:00,360 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:00,383 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:57:00,853 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:57:00,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:57:00,872 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:02,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4402#(and (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#valid)_BEFORE_CALL_9| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_9 Int) (|v_old(#length)_BEFORE_CALL_9| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_9| (Array Int (Array Int Int)))) (and (= (select |v_old(#valid)_BEFORE_CALL_9| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_9| v_main_~a~0.base_BEFORE_CALL_9) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 1) 0) (not (= v_main_~a~0.base_BEFORE_CALL_9 0)) (= (select |v_old(#valid)_BEFORE_CALL_9| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_9| 3) 12) (not (= v_main_~a~0.base_BEFORE_CALL_9 3)) (not (= v_main_~a~0.base_BEFORE_CALL_9 1)) (not (= v_main_~a~0.base_BEFORE_CALL_9 2)) (= (select |v_old(#valid)_BEFORE_CALL_9| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= v_main_~a~0.base_BEFORE_CALL_9 |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= |v_old(#valid)_BEFORE_CALL_9| |v_old(#length)_BEFORE_CALL_9|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 0)) (= 20 (select |v_old(#length)_BEFORE_CALL_9| 2)) (= (select |v_old(#valid)_BEFORE_CALL_9| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_9| 1) 2))) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:02,297 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:02,298 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:02,298 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 31, 32] total 93 [2023-04-01 08:57:02,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33254468] [2023-04-01 08:57:02,298 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:02,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2023-04-01 08:57:02,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:02,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2023-04-01 08:57:02,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=10358, Unknown=0, NotChecked=0, Total=10712 [2023-04-01 08:57:02,301 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 93 states, 93 states have (on average 1.1505376344086022) internal successors, (107), 91 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:05,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:05,053 INFO L93 Difference]: Finished difference Result 106 states and 123 transitions. [2023-04-01 08:57:05,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2023-04-01 08:57:05,053 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 1.1505376344086022) internal successors, (107), 91 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2023-04-01 08:57:05,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:05,054 INFO L225 Difference]: With dead ends: 106 [2023-04-01 08:57:05,054 INFO L226 Difference]: Without dead ends: 101 [2023-04-01 08:57:05,059 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3866 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=525, Invalid=14727, Unknown=0, NotChecked=0, Total=15252 [2023-04-01 08:57:05,059 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 2577 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 2598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:05,060 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 331 Invalid, 2598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2577 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-04-01 08:57:05,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-04-01 08:57:05,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 74. [2023-04-01 08:57:05,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.2028985507246377) internal successors, (83), 69 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:05,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 87 transitions. [2023-04-01 08:57:05,078 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 87 transitions. Word has length 45 [2023-04-01 08:57:05,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:05,079 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 87 transitions. [2023-04-01 08:57:05,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 1.1505376344086022) internal successors, (107), 91 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:05,079 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 87 transitions. [2023-04-01 08:57:05,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 08:57:05,079 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:05,079 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:05,084 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:05,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:05,281 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:05,281 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:05,281 INFO L85 PathProgramCache]: Analyzing trace with hash 2006594327, now seen corresponding path program 10 times [2023-04-01 08:57:05,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:05,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325665464] [2023-04-01 08:57:05,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:05,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:05,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:05,397 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-04-01 08:57:05,398 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:05,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325665464] [2023-04-01 08:57:05,398 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325665464] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:05,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852746964] [2023-04-01 08:57:05,398 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:57:05,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:05,398 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:05,399 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:05,425 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-01 08:57:05,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:05,465 INFO L262 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:57:05,468 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:05,542 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-04-01 08:57:05,542 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:05,607 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-04-01 08:57:05,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852746964] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:05,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [424634349] [2023-04-01 08:57:05,608 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:05,609 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:05,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:05,609 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:05,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:05,633 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:57:06,080 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:57:06,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:57:06,104 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:06,689 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5093#(and (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#memory_int)_BEFORE_CALL_10| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_10| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_10 Int) (|v_old(#length)_BEFORE_CALL_10| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_10| |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#length)_BEFORE_CALL_10| 3) 12) (not (= v_main_~a~0.base_BEFORE_CALL_10 2)) (not (= |v_old(#valid)_BEFORE_CALL_10| (select |v_old(#memory_int)_BEFORE_CALL_10| 1))) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 0)) (= (select |v_old(#length)_BEFORE_CALL_10| 2) 20) (not (= v_main_~a~0.base_BEFORE_CALL_10 1)) (not (= v_main_~a~0.base_BEFORE_CALL_10 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_10| 1)) (= (select |v_old(#valid)_BEFORE_CALL_10| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 1) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_10| 1) |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#valid)_BEFORE_CALL_10| v_main_~a~0.base_BEFORE_CALL_10) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 2) 1) (not (= v_main_~a~0.base_BEFORE_CALL_10 |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_10| 0) 0) (not (= v_main_~a~0.base_BEFORE_CALL_10 3)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:06,689 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:06,689 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:06,689 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-01 08:57:06,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185818543] [2023-04-01 08:57:06,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:06,689 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:57:06,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:06,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:57:06,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=791, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:57:06,690 INFO L87 Difference]: Start difference. First operand 74 states and 87 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:06,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:06,909 INFO L93 Difference]: Finished difference Result 157 states and 187 transitions. [2023-04-01 08:57:06,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 08:57:06,909 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2023-04-01 08:57:06,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:06,910 INFO L225 Difference]: With dead ends: 157 [2023-04-01 08:57:06,910 INFO L226 Difference]: Without dead ends: 79 [2023-04-01 08:57:06,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 112 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 479 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=199, Invalid=1061, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 08:57:06,911 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 11 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:06,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 57 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:06,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-04-01 08:57:06,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2023-04-01 08:57:06,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.164179104477612) internal successors, (78), 67 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:06,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 82 transitions. [2023-04-01 08:57:06,927 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 82 transitions. Word has length 46 [2023-04-01 08:57:06,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:06,927 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 82 transitions. [2023-04-01 08:57:06,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:06,927 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 82 transitions. [2023-04-01 08:57:06,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-04-01 08:57:06,927 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:06,927 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:06,934 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:07,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-01 08:57:07,133 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:07,133 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:07,133 INFO L85 PathProgramCache]: Analyzing trace with hash 706152549, now seen corresponding path program 11 times [2023-04-01 08:57:07,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:07,133 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095384739] [2023-04-01 08:57:07,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:07,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:07,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:07,235 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 08:57:07,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:07,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095384739] [2023-04-01 08:57:07,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095384739] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:07,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601140997] [2023-04-01 08:57:07,235 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:57:07,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:07,236 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:07,236 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:07,239 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 08:57:07,306 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 08:57:07,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:07,308 INFO L262 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:57:07,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:07,391 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 08:57:07,391 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:07,466 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-01 08:57:07,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601140997] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:07,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [693239183] [2023-04-01 08:57:07,468 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:07,468 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:07,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:07,468 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:07,468 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:07,490 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:57:07,937 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:57:07,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:57:07,968 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:08,528 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5855#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_11| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_11| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_11 Int) (|v_old(#length)_BEFORE_CALL_11| (Array Int Int))) (and (not (= v_main_~a~0.base_BEFORE_CALL_11 0)) (not (= |v_old(#valid)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (= 1 (select |v_old(#valid)_BEFORE_CALL_11| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 1) 0) (not (= v_main_~a~0.base_BEFORE_CALL_11 1)) (not (= v_main_~a~0.base_BEFORE_CALL_11 3)) (not (= |v_old(#length)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (not (= v_main_~a~0.base_BEFORE_CALL_11 |#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_11 2)) (= (select |v_old(#valid)_BEFORE_CALL_11| v_main_~a~0.base_BEFORE_CALL_11) 0) (= (select |v_old(#valid)_BEFORE_CALL_11| 3) 1) (= 20 (select |v_old(#length)_BEFORE_CALL_11| 2)) (= (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))) (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:08,528 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:08,528 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:08,528 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-01 08:57:08,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488413690] [2023-04-01 08:57:08,528 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:08,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:57:08,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:08,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:57:08,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=799, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:57:08,529 INFO L87 Difference]: Start difference. First operand 72 states and 82 transitions. Second operand has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:08,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:08,749 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2023-04-01 08:57:08,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 08:57:08,750 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2023-04-01 08:57:08,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:08,750 INFO L225 Difference]: With dead ends: 78 [2023-04-01 08:57:08,750 INFO L226 Difference]: Without dead ends: 53 [2023-04-01 08:57:08,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 114 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=202, Invalid=1204, Unknown=0, NotChecked=0, Total=1406 [2023-04-01 08:57:08,751 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:08,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 66 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:08,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-04-01 08:57:08,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2023-04-01 08:57:08,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 48 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:08,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2023-04-01 08:57:08,760 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 47 [2023-04-01 08:57:08,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:08,760 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2023-04-01 08:57:08,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.35) internal successors, (47), 20 states have internal predecessors, (47), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:08,760 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2023-04-01 08:57:08,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-04-01 08:57:08,760 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:08,760 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:08,765 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:08,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-01 08:57:08,966 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:08,966 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:08,966 INFO L85 PathProgramCache]: Analyzing trace with hash 674126319, now seen corresponding path program 12 times [2023-04-01 08:57:08,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:08,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845245529] [2023-04-01 08:57:08,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:08,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:09,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:12,555 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 1 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:12,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:12,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845245529] [2023-04-01 08:57:12,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845245529] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:12,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465994539] [2023-04-01 08:57:12,556 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:57:12,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:12,556 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:12,557 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 08:57:12,559 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 08:57:12,629 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:57:12,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:12,632 INFO L262 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 130 conjunts are in the unsatisfiable core [2023-04-01 08:57:12,634 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:14,391 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:57:14,391 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:16,937 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:57:16,937 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 235 [2023-04-01 08:57:17,807 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:57:17,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465994539] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:17,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [212508405] [2023-04-01 08:57:17,809 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 08:57:17,809 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:17,809 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:17,809 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:17,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:17,834 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 56 for LOIs [2023-04-01 08:57:18,290 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2023-04-01 08:57:18,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 08:57:18,308 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:19,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6550#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_12| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_12| (Array Int Int)) (v_main_~a~0.base_BEFORE_CALL_12 Int) (|v_old(#length)_BEFORE_CALL_12| (Array Int Int))) (and (not (= v_main_~a~0.base_BEFORE_CALL_12 |#StackHeapBarrier|)) (not (= v_main_~a~0.base_BEFORE_CALL_12 2)) (= (select |v_old(#length)_BEFORE_CALL_12| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_12| 3) 1) (not (= v_main_~a~0.base_BEFORE_CALL_12 1)) (not (= |v_old(#valid)_BEFORE_CALL_12| (select |v_old(#memory_int)_BEFORE_CALL_12| 1))) (= (select |v_old(#valid)_BEFORE_CALL_12| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_12| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_12| v_main_~a~0.base_BEFORE_CALL_12) 0) (not (= v_main_~a~0.base_BEFORE_CALL_12 3)) (= (select |v_old(#length)_BEFORE_CALL_12| 2) 20) (not (= |v_old(#valid)_BEFORE_CALL_12| |v_old(#length)_BEFORE_CALL_12|)) (= 0 (select (select |v_old(#memory_int)_BEFORE_CALL_12| 1) 1)) (not (= |v_old(#length)_BEFORE_CALL_12| (select |v_old(#memory_int)_BEFORE_CALL_12| 1))) (= (select |v_old(#valid)_BEFORE_CALL_12| 1) 1) (not (= v_main_~a~0.base_BEFORE_CALL_12 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_12| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_12| 0) 0))) (= ~MAX~0 100000) (not (= ~SIZE~0 100000)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:19,737 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:19,737 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:19,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 37, 38] total 112 [2023-04-01 08:57:19,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347424724] [2023-04-01 08:57:19,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:19,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2023-04-01 08:57:19,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:19,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2023-04-01 08:57:19,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=14507, Unknown=0, NotChecked=0, Total=15006 [2023-04-01 08:57:19,740 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand has 112 states, 112 states have (on average 1.125) internal successors, (126), 110 states have internal predecessors, (126), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)