/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_sum4.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 08:55:52,645 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 08:55:52,646 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 08:55:52,680 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 08:55:52,680 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 08:55:52,681 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 08:55:52,682 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 08:55:52,683 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 08:55:52,684 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 08:55:52,684 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 08:55:52,685 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 08:55:52,686 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 08:55:52,686 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 08:55:52,687 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 08:55:52,687 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 08:55:52,688 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 08:55:52,688 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 08:55:52,689 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 08:55:52,690 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 08:55:52,691 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 08:55:52,692 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 08:55:52,693 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 08:55:52,694 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 08:55:52,695 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 08:55:52,697 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 08:55:52,713 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 08:55:52,713 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 08:55:52,714 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 08:55:52,714 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 08:55:52,715 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 08:55:52,715 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 08:55:52,715 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 08:55:52,716 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 08:55:52,716 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 08:55:52,717 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 08:55:52,717 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 08:55:52,717 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 08:55:52,718 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 08:55:52,718 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 08:55:52,718 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 08:55:52,719 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 08:55:52,719 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 08:55:52,744 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 08:55:52,744 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 08:55:52,744 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 08:55:52,744 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 08:55:52,745 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 08:55:52,745 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 08:55:52,745 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 08:55:52,745 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 08:55:52,745 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 08:55:52,745 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 08:55:52,745 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 08:55:52,745 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 08:55:52,746 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 08:55:52,746 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 08:55:52,746 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 08:55:52,746 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 08:55:52,746 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 08:55:52,746 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 08:55:52,746 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 08:55:52,747 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 08:55:52,748 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 08:55:52,748 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 08:55:52,748 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:55:52,748 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 08:55:52,748 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 08:55:52,748 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 08:55:52,748 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 08:55:52,748 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 08:55:52,748 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 08:55:52,748 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 08:55:52,749 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 08:55:52,749 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 08:55:52,923 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 08:55:52,948 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 08:55:52,952 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 08:55:52,953 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 08:55:52,954 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 08:55:52,954 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum4.c [2023-04-01 08:55:53,973 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 08:55:54,177 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 08:55:54,178 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum4.c [2023-04-01 08:55:54,181 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/02efc729e/b79395b96a3340d390f3f86bf0b096df/FLAGb495568c7 [2023-04-01 08:55:54,193 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/02efc729e/b79395b96a3340d390f3f86bf0b096df [2023-04-01 08:55:54,194 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 08:55:54,195 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 08:55:54,196 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 08:55:54,196 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 08:55:54,198 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 08:55:54,199 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,199 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c3bff48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54, skipping insertion in model container [2023-04-01 08:55:54,199 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,205 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 08:55:54,217 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 08:55:54,336 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_sum4.c[400,413] [2023-04-01 08:55:54,362 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:55:54,370 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 08:55:54,379 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_sum4.c[400,413] [2023-04-01 08:55:54,401 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:55:54,410 INFO L208 MainTranslator]: Completed translation [2023-04-01 08:55:54,411 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54 WrapperNode [2023-04-01 08:55:54,411 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 08:55:54,411 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 08:55:54,411 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 08:55:54,412 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 08:55:54,420 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,420 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,431 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,431 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,444 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,448 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,449 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,450 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,451 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 08:55:54,452 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 08:55:54,452 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 08:55:54,452 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 08:55:54,454 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (1/1) ... [2023-04-01 08:55:54,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:55:54,468 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:55:54,499 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 08:55:54,516 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 08:55:54,537 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 08:55:54,537 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 08:55:54,538 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 08:55:54,538 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 08:55:54,538 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 08:55:54,538 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 08:55:54,538 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 08:55:54,538 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 08:55:54,538 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 08:55:54,538 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 08:55:54,538 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 08:55:54,538 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 08:55:54,538 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2023-04-01 08:55:54,538 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 08:55:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 08:55:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 08:55:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 08:55:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 08:55:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 08:55:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 08:55:54,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 08:55:54,588 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 08:55:54,589 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 08:55:54,802 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 08:55:54,856 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 08:55:54,857 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-04-01 08:55:54,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:55:54 BoogieIcfgContainer [2023-04-01 08:55:54,858 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 08:55:54,860 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 08:55:54,860 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 08:55:54,862 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 08:55:54,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 08:55:54" (1/3) ... [2023-04-01 08:55:54,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b37f0ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:55:54, skipping insertion in model container [2023-04-01 08:55:54,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:55:54" (2/3) ... [2023-04-01 08:55:54,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b37f0ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:55:54, skipping insertion in model container [2023-04-01 08:55:54,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:55:54" (3/3) ... [2023-04-01 08:55:54,864 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum4.c [2023-04-01 08:55:54,876 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 08:55:54,876 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 08:55:54,917 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 08:55:54,923 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;@14df13c1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 08:55:54,923 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 08:55:54,927 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 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 08:55:54,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 08:55:54,932 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:55:54,933 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:55:54,934 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:55:54,940 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:55:54,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1240685489, now seen corresponding path program 1 times [2023-04-01 08:55:54,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:55:54,947 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703816409] [2023-04-01 08:55:54,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:55:54,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:55:55,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:55:55,220 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 08:55:55,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:55:55,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703816409] [2023-04-01 08:55:55,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703816409] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:55:55,221 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:55:55,221 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 08:55:55,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835219611] [2023-04-01 08:55:55,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:55:55,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:55:55,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:55:55,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:55:55,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:55:55,258 INFO L87 Difference]: Start difference. First operand has 27 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 08:55:55,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:55:55,324 INFO L93 Difference]: Finished difference Result 48 states and 68 transitions. [2023-04-01 08:55:55,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:55:55,328 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 19 [2023-04-01 08:55:55,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:55:55,333 INFO L225 Difference]: With dead ends: 48 [2023-04-01 08:55:55,333 INFO L226 Difference]: Without dead ends: 21 [2023-04-01 08:55:55,335 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 08:55:55,339 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:55:55,340 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:55:55,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-01 08:55:55,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-04-01 08:55:55,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.5625) internal successors, (25), 16 states have internal predecessors, (25), 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 08:55:55,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 29 transitions. [2023-04-01 08:55:55,362 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 29 transitions. Word has length 19 [2023-04-01 08:55:55,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:55:55,362 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 29 transitions. [2023-04-01 08:55:55,362 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 08:55:55,362 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 29 transitions. [2023-04-01 08:55:55,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-01 08:55:55,363 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:55:55,363 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] [2023-04-01 08:55:55,363 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 08:55:55,363 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:55:55,364 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:55:55,364 INFO L85 PathProgramCache]: Analyzing trace with hash -298636248, now seen corresponding path program 1 times [2023-04-01 08:55:55,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:55:55,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102710804] [2023-04-01 08:55:55,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:55:55,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:55:55,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:55:55,452 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 08:55:55,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:55:55,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102710804] [2023-04-01 08:55:55,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1102710804] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:55:55,453 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:55:55,453 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 08:55:55,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099573535] [2023-04-01 08:55:55,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:55:55,454 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 08:55:55,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:55:55,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 08:55:55,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 08:55:55,455 INFO L87 Difference]: Start difference. First operand 21 states and 29 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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 08:55:55,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:55:55,500 INFO L93 Difference]: Finished difference Result 41 states and 63 transitions. [2023-04-01 08:55:55,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 08:55:55,501 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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 20 [2023-04-01 08:55:55,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:55:55,502 INFO L225 Difference]: With dead ends: 41 [2023-04-01 08:55:55,502 INFO L226 Difference]: Without dead ends: 29 [2023-04-01 08:55:55,502 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 08:55:55,503 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 28 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:55:55,503 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 15 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:55:55,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-04-01 08:55:55,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-04-01 08:55:55,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 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 08:55:55,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 37 transitions. [2023-04-01 08:55:55,509 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 37 transitions. Word has length 20 [2023-04-01 08:55:55,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:55:55,510 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 37 transitions. [2023-04-01 08:55:55,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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 08:55:55,510 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 37 transitions. [2023-04-01 08:55:55,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 08:55:55,510 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:55:55,510 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:55:55,511 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 08:55:55,511 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:55:55,511 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:55:55,511 INFO L85 PathProgramCache]: Analyzing trace with hash 167467599, now seen corresponding path program 1 times [2023-04-01 08:55:55,511 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:55:55,511 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880668615] [2023-04-01 08:55:55,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:55:55,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:55:55,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:55:55,652 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 08:55:55,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:55:55,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880668615] [2023-04-01 08:55:55,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1880668615] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:55:55,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910957332] [2023-04-01 08:55:55,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:55:55,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:55:55,654 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:55:55,675 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 08:55:55,689 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 08:55:55,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:55:55,776 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:55:55,785 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:55:55,845 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 08:55:55,845 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:55:55,866 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 08:55:55,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910957332] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:55:55,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [102986737] [2023-04-01 08:55:55,907 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:55:55,908 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:55:55,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:55:55,913 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:55:55,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:55:56,025 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:55:57,145 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:55:57,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:55:57,177 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:55:57,796 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '447#(and (exists ((|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_1| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_1| Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_1| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_1| |v_old(#length)_BEFORE_CALL_1|)) (= (select |v_old(#length)_BEFORE_CALL_1| 3) 12) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#valid)_BEFORE_CALL_1|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_1| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_1| 2) 12) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_1|)) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_1| |v_main_~#a~0.base_BEFORE_CALL_1|) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_1|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_1|)))) (= |__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 08:55:57,796 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:55:57,796 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:55:57,796 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 08:55:57,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560034770] [2023-04-01 08:55:57,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:55:57,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 08:55:57,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:55:57,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 08:55:57,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:55:57,798 INFO L87 Difference]: Start difference. First operand 29 states and 37 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 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 08:55:57,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:55:57,827 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2023-04-01 08:55:57,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 08:55:57,828 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 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 28 [2023-04-01 08:55:57,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:55:57,828 INFO L225 Difference]: With dead ends: 51 [2023-04-01 08:55:57,828 INFO L226 Difference]: Without dead ends: 30 [2023-04-01 08:55:57,829 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:55:57,829 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:55:57,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:55:57,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-04-01 08:55:57,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-04-01 08:55:57,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.36) internal successors, (34), 25 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 08:55:57,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2023-04-01 08:55:57,833 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 28 [2023-04-01 08:55:57,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:55:57,833 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2023-04-01 08:55:57,833 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 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 08:55:57,834 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2023-04-01 08:55:57,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-01 08:55:57,834 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:55:57,834 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:55:57,846 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 08:55:58,034 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 08:55:58,035 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:55:58,035 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:55:58,035 INFO L85 PathProgramCache]: Analyzing trace with hash -156688456, now seen corresponding path program 2 times [2023-04-01 08:55:58,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:55:58,036 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162609045] [2023-04-01 08:55:58,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:55:58,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:55:58,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:55:58,130 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:55:58,140 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:55:58,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162609045] [2023-04-01 08:55:58,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162609045] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:55:58,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523973494] [2023-04-01 08:55:58,141 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:55:58,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:55:58,141 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:55:58,143 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 08:55:58,145 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 08:55:58,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 08:55:58,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:55:58,193 INFO L262 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:55:58,194 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:55:58,222 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:55:58,222 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:55:58,245 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:55:58,245 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523973494] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:55:58,245 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1214286627] [2023-04-01 08:55:58,263 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:55:58,263 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:55:58,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:55:58,264 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:55:58,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:55:58,303 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:55:58,942 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:55:58,960 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:55:58,963 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:55:59,511 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '786#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_2| Int) (|v_old(#valid)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_2| (Array Int (Array Int Int)))) (and (= 2 (select |v_old(#length)_BEFORE_CALL_2| 1)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#length)_BEFORE_CALL_2| 3) 12) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 1) 0) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_2|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 0) 0) (= (select |v_old(#length)_BEFORE_CALL_2| 2) 12) (= 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) (= (select |v_old(#valid)_BEFORE_CALL_2| |v_main_~#a~0.base_BEFORE_CALL_2|) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_2| 1) 1))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:55:59,511 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:55:59,511 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:55:59,512 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-04-01 08:55:59,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386179304] [2023-04-01 08:55:59,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:55:59,512 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 08:55:59,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:55:59,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 08:55:59,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-04-01 08:55:59,513 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 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 08:55:59,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:55:59,574 INFO L93 Difference]: Finished difference Result 57 states and 79 transitions. [2023-04-01 08:55:59,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 08:55:59,576 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 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 29 [2023-04-01 08:55:59,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:55:59,577 INFO L225 Difference]: With dead ends: 57 [2023-04-01 08:55:59,577 INFO L226 Difference]: Without dead ends: 38 [2023-04-01 08:55:59,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 71 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 08:55:59,578 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:55:59,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 30 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:55:59,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-04-01 08:55:59,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-04-01 08:55:59,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 33 states have internal predecessors, (42), 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 08:55:59,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2023-04-01 08:55:59,582 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 29 [2023-04-01 08:55:59,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:55:59,582 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2023-04-01 08:55:59,582 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 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 08:55:59,582 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2023-04-01 08:55:59,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 08:55:59,583 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:55:59,583 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:55:59,599 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 08:55:59,788 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 08:55:59,788 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:55:59,789 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:55:59,789 INFO L85 PathProgramCache]: Analyzing trace with hash -902040911, now seen corresponding path program 3 times [2023-04-01 08:55:59,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:55:59,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080489056] [2023-04-01 08:55:59,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:55:59,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:55:59,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:01,402 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:01,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:01,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080489056] [2023-04-01 08:56:01,402 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080489056] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:01,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910600844] [2023-04-01 08:56:01,403 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:01,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:01,403 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:01,404 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 08:56:01,406 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 08:56:01,474 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:01,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:01,475 INFO L262 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 80 conjunts are in the unsatisfiable core [2023-04-01 08:56:01,478 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:01,506 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-01 08:56:01,785 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:01,787 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:56:01,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2023-04-01 08:56:01,836 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:01,836 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:02,087 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 08:56:02,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910600844] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:02,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1587414172] [2023-04-01 08:56:02,089 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:56:02,089 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:02,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:02,089 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:02,089 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:02,140 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:56:02,774 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:56:02,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:02,793 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:03,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1213#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int) (|v_old(#length)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_3| (Array Int (Array Int Int)))) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 0) 48) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_3| 0) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_3|)) (not (= |v_old(#valid)_BEFORE_CALL_3| |v_old(#length)_BEFORE_CALL_3|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= 2 (select |v_old(#length)_BEFORE_CALL_3| 1)) (= (select |v_old(#length)_BEFORE_CALL_3| 3) 12) (not (= |v_old(#length)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) (not (= |v_old(#valid)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 3) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select |v_old(#length)_BEFORE_CALL_3| 2) 12))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:03,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:03,438 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:03,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 10] total 20 [2023-04-01 08:56:03,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607879230] [2023-04-01 08:56:03,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:03,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:56:03,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:03,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:56:03,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=845, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:56:03,440 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 18 states have internal predecessors, (61), 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 08:56:03,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:03,682 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2023-04-01 08:56:03,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 08:56:03,682 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 18 states have internal predecessors, (61), 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 37 [2023-04-01 08:56:03,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:03,683 INFO L225 Difference]: With dead ends: 65 [2023-04-01 08:56:03,683 INFO L226 Difference]: Without dead ends: 60 [2023-04-01 08:56:03,683 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 88 SyntacticMatches, 24 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2023-04-01 08:56:03,684 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:03,684 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 87 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 527 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 08:56:03,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-01 08:56:03,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2023-04-01 08:56:03,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.3018867924528301) internal successors, (69), 53 states have internal predecessors, (69), 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 08:56:03,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 73 transitions. [2023-04-01 08:56:03,689 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 73 transitions. Word has length 37 [2023-04-01 08:56:03,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:03,690 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 73 transitions. [2023-04-01 08:56:03,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 18 states have internal predecessors, (61), 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 08:56:03,690 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 73 transitions. [2023-04-01 08:56:03,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-01 08:56:03,691 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:03,691 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:03,695 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-04-01 08:56:03,891 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 08:56:03,891 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:03,892 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:03,892 INFO L85 PathProgramCache]: Analyzing trace with hash 474609036, now seen corresponding path program 4 times [2023-04-01 08:56:03,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:03,892 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747698952] [2023-04-01 08:56:03,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:03,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:03,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:03,964 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 08:56:03,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:03,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747698952] [2023-04-01 08:56:03,964 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747698952] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:03,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281647855] [2023-04-01 08:56:03,965 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:56:03,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:03,965 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:03,981 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 08:56:04,013 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 08:56:04,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:04,070 INFO L262 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:56:04,072 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:04,127 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 08:56:04,127 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:04,164 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-01 08:56:04,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281647855] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:04,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229790277] [2023-04-01 08:56:04,168 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:56:04,168 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:04,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:04,170 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:04,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:04,195 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:56:04,761 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:56:04,788 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:04,791 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:05,339 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1698#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_4| Int) (|v_old(#memory_int)_BEFORE_CALL_4| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_4| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_4| (Array Int Int))) (and (= (select |v_old(#length)_BEFORE_CALL_4| 1) 2) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_4|)) (= (select |v_old(#valid)_BEFORE_CALL_4| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_4| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_4| |v_old(#length)_BEFORE_CALL_4|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_4| 1) |v_old(#length)_BEFORE_CALL_4|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 1) 0) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_4|)) (= (select |v_old(#valid)_BEFORE_CALL_4| |v_main_~#a~0.base_BEFORE_CALL_4|) 0) (= (select |v_old(#valid)_BEFORE_CALL_4| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_4| 3) 12) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |v_old(#valid)_BEFORE_CALL_4| (select |v_old(#memory_int)_BEFORE_CALL_4| 1))) (= (select |v_old(#valid)_BEFORE_CALL_4| 2) 1) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 0)) (= (select |v_old(#length)_BEFORE_CALL_4| 2) 12))) (= |__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 08:56:05,339 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:05,339 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:05,339 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-01 08:56:05,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794831944] [2023-04-01 08:56:05,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:05,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 08:56:05,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:05,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 08:56:05,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2023-04-01 08:56:05,341 INFO L87 Difference]: Start difference. First operand 58 states and 73 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 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 08:56:05,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:05,517 INFO L93 Difference]: Finished difference Result 110 states and 140 transitions. [2023-04-01 08:56:05,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 08:56:05,518 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 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 38 [2023-04-01 08:56:05,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:05,520 INFO L225 Difference]: With dead ends: 110 [2023-04-01 08:56:05,520 INFO L226 Difference]: Without dead ends: 59 [2023-04-01 08:56:05,521 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=111, Invalid=645, Unknown=0, NotChecked=0, Total=756 [2023-04-01 08:56:05,523 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 26 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:05,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 45 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:05,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-04-01 08:56:05,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-04-01 08:56:05,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.2962962962962963) internal successors, (70), 54 states have internal predecessors, (70), 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 08:56:05,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 74 transitions. [2023-04-01 08:56:05,535 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 74 transitions. Word has length 38 [2023-04-01 08:56:05,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:05,536 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 74 transitions. [2023-04-01 08:56:05,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 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 08:56:05,537 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 74 transitions. [2023-04-01 08:56:05,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-04-01 08:56:05,540 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:05,540 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:05,547 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 08:56:05,744 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 08:56:05,747 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:05,747 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:05,747 INFO L85 PathProgramCache]: Analyzing trace with hash -468530251, now seen corresponding path program 5 times [2023-04-01 08:56:05,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:05,748 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136774290] [2023-04-01 08:56:05,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:05,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:05,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:05,827 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 08:56:05,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:05,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136774290] [2023-04-01 08:56:05,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136774290] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:05,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728391461] [2023-04-01 08:56:05,827 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:05,827 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:05,828 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:05,828 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 08:56:05,830 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 08:56:05,882 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:56:05,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:05,883 INFO L262 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:56:05,884 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:05,961 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 08:56:05,961 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:06,038 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 08:56:06,039 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728391461] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:06,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1358167415] [2023-04-01 08:56:06,041 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:56:06,041 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:06,042 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:06,042 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:06,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:06,068 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:56:06,675 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:56:06,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:06,694 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:07,213 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2287#(and (= |__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_5| Int) (|v_old(#memory_int)_BEFORE_CALL_5| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_5| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_5| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_5| (select |v_old(#memory_int)_BEFORE_CALL_5| 1))) (= (select |v_old(#valid)_BEFORE_CALL_5| 1) 1) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_5|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= (select |v_old(#length)_BEFORE_CALL_5| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_5| 2) 1) (= 12 (select |v_old(#length)_BEFORE_CALL_5| 2)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 1) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| |v_main_~#a~0.base_BEFORE_CALL_5|) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_5| 1) |v_old(#length)_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_5| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_5| |v_old(#length)_BEFORE_CALL_5|)) (= 2 (select |v_old(#length)_BEFORE_CALL_5| 1)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_5|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:07,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:07,214 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:07,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2023-04-01 08:56:07,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546921627] [2023-04-01 08:56:07,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:07,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-01 08:56:07,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:07,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-01 08:56:07,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2023-04-01 08:56:07,215 INFO L87 Difference]: Start difference. First operand 59 states and 74 transitions. Second operand has 16 states, 16 states have (on average 3.3125) internal successors, (53), 16 states have internal predecessors, (53), 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 08:56:07,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:07,382 INFO L93 Difference]: Finished difference Result 90 states and 118 transitions. [2023-04-01 08:56:07,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-01 08:56:07,382 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.3125) internal successors, (53), 16 states have internal predecessors, (53), 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 08:56:07,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:07,383 INFO L225 Difference]: With dead ends: 90 [2023-04-01 08:56:07,383 INFO L226 Difference]: Without dead ends: 47 [2023-04-01 08:56:07,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 98 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=138, Invalid=854, Unknown=0, NotChecked=0, Total=992 [2023-04-01 08:56:07,384 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 96 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:07,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 62 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:07,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-04-01 08:56:07,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-04-01 08:56:07,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 42 states have internal predecessors, (51), 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 08:56:07,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2023-04-01 08:56:07,388 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 39 [2023-04-01 08:56:07,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:07,388 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2023-04-01 08:56:07,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.3125) internal successors, (53), 16 states have internal predecessors, (53), 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 08:56:07,389 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2023-04-01 08:56:07,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 08:56:07,389 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:07,389 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:07,408 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 08:56:07,589 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 08:56:07,590 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:07,590 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:07,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1508996943, now seen corresponding path program 6 times [2023-04-01 08:56:07,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:07,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588305894] [2023-04-01 08:56:07,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:07,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:07,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:09,906 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:09,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:09,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588305894] [2023-04-01 08:56:09,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588305894] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:09,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209121387] [2023-04-01 08:56:09,907 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:09,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:09,907 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:09,933 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 08:56:09,960 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 08:56:09,998 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:09,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:10,001 INFO L262 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 114 conjunts are in the unsatisfiable core [2023-04-01 08:56:10,005 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:10,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-01 08:56:10,454 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:10,454 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:10,935 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:10,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209121387] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:10,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696610244] [2023-04-01 08:56:10,936 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:56:10,937 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:10,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:10,937 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:10,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:10,959 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:56:11,563 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:56:11,581 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:11,584 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:12,489 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2892#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#valid)_BEFORE_CALL_6| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_6| (Array Int (Array Int Int))) (|v_main_~#a~0.base_BEFORE_CALL_6| Int) (|v_old(#length)_BEFORE_CALL_6| (Array Int Int))) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_6| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_6| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_6| |v_main_~#a~0.base_BEFORE_CALL_6|) 0) (not (= |v_old(#valid)_BEFORE_CALL_6| |v_old(#length)_BEFORE_CALL_6|)) (= 12 (select |v_old(#length)_BEFORE_CALL_6| 2)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_6|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 0) 48) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_6|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_6| 1) |v_old(#length)_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 2) 1) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#length)_BEFORE_CALL_6| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_6| (select |v_old(#memory_int)_BEFORE_CALL_6| 1))) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_6| 0) 0))) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:12,489 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:12,489 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:12,489 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16, 12] total 46 [2023-04-01 08:56:12,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809550081] [2023-04-01 08:56:12,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:12,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-04-01 08:56:12,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:12,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-04-01 08:56:12,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=2988, Unknown=0, NotChecked=0, Total=3192 [2023-04-01 08:56:12,491 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 46 states, 46 states have (on average 2.347826086956522) internal successors, (108), 44 states have internal predecessors, (108), 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 08:56:14,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:14,816 INFO L93 Difference]: Finished difference Result 167 states and 209 transitions. [2023-04-01 08:56:14,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-04-01 08:56:14,817 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.347826086956522) internal successors, (108), 44 states have internal predecessors, (108), 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 46 [2023-04-01 08:56:14,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:14,819 INFO L225 Difference]: With dead ends: 167 [2023-04-01 08:56:14,819 INFO L226 Difference]: Without dead ends: 112 [2023-04-01 08:56:14,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 118 SyntacticMatches, 4 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1751 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=530, Invalid=6276, Unknown=0, NotChecked=0, Total=6806 [2023-04-01 08:56:14,821 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 1762 mSolverCounterSat, 371 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 2133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 1762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:14,821 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 145 Invalid, 2133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [371 Valid, 1762 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-01 08:56:14,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-04-01 08:56:14,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 92. [2023-04-01 08:56:14,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.2528735632183907) internal successors, (109), 87 states have internal predecessors, (109), 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 08:56:14,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 113 transitions. [2023-04-01 08:56:14,835 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 113 transitions. Word has length 46 [2023-04-01 08:56:14,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:14,836 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 113 transitions. [2023-04-01 08:56:14,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.347826086956522) internal successors, (108), 44 states have internal predecessors, (108), 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 08:56:14,836 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 113 transitions. [2023-04-01 08:56:14,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-04-01 08:56:14,839 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:14,839 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:14,845 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-01 08:56:15,045 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 08:56:15,045 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:15,045 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:15,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1231336790, now seen corresponding path program 7 times [2023-04-01 08:56:15,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:15,046 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87159984] [2023-04-01 08:56:15,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:15,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:15,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:15,168 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-04-01 08:56:15,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:15,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87159984] [2023-04-01 08:56:15,169 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87159984] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:15,169 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474629402] [2023-04-01 08:56:15,169 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:56:15,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:15,169 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:15,186 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 08:56:15,187 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 08:56:15,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:15,245 INFO L262 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 08:56:15,248 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:15,304 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-04-01 08:56:15,304 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:15,355 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-04-01 08:56:15,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474629402] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:15,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [712770591] [2023-04-01 08:56:15,358 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:56:15,358 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:15,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:15,358 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:15,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:15,378 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:56:15,866 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:56:15,881 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:15,883 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:16,375 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3762#(and (exists ((|v_old(#valid)_BEFORE_CALL_7| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_7| (Array Int (Array Int Int))) (|v_main_~#a~0.base_BEFORE_CALL_7| Int) (|v_old(#length)_BEFORE_CALL_7| (Array Int Int))) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 1) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 2) 1) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 1) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_7| 3) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#valid)_BEFORE_CALL_7|)) (= 2 (select |v_old(#length)_BEFORE_CALL_7| 1)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_7|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| |v_main_~#a~0.base_BEFORE_CALL_7|) 0) (= (select |v_old(#length)_BEFORE_CALL_7| 3) 12) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#length)_BEFORE_CALL_7|)) (= 12 (select |v_old(#length)_BEFORE_CALL_7| 2)) (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 08:56:16,375 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:16,375 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:16,375 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-04-01 08:56:16,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400625823] [2023-04-01 08:56:16,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:16,378 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 08:56:16,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:16,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 08:56:16,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=653, Unknown=0, NotChecked=0, Total=756 [2023-04-01 08:56:16,379 INFO L87 Difference]: Start difference. First operand 92 states and 113 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 17 states have internal predecessors, (38), 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 08:56:16,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:16,493 INFO L93 Difference]: Finished difference Result 129 states and 163 transitions. [2023-04-01 08:56:16,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 08:56:16,493 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 17 states have internal predecessors, (38), 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 48 [2023-04-01 08:56:16,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:16,494 INFO L225 Difference]: With dead ends: 129 [2023-04-01 08:56:16,494 INFO L226 Difference]: Without dead ends: 56 [2023-04-01 08:56:16,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 120 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=169, Invalid=887, Unknown=0, NotChecked=0, Total=1056 [2023-04-01 08:56:16,495 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 132 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:16,495 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 56 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:16,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-04-01 08:56:16,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-04-01 08:56:16,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.1764705882352942) internal successors, (60), 51 states have internal predecessors, (60), 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 08:56:16,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2023-04-01 08:56:16,507 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 48 [2023-04-01 08:56:16,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:16,507 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2023-04-01 08:56:16,507 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 17 states have internal predecessors, (38), 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 08:56:16,508 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2023-04-01 08:56:16,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-04-01 08:56:16,508 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:16,508 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:16,515 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 08:56:16,713 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 08:56:16,713 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:16,713 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:16,713 INFO L85 PathProgramCache]: Analyzing trace with hash -2128750159, now seen corresponding path program 8 times [2023-04-01 08:56:16,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:16,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595571783] [2023-04-01 08:56:16,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:16,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:16,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:19,946 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 1 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:19,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:19,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595571783] [2023-04-01 08:56:19,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595571783] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:19,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164709773] [2023-04-01 08:56:19,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:19,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:19,947 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:19,948 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 08:56:19,950 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 08:56:20,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:56:20,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:20,037 INFO L262 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 151 conjunts are in the unsatisfiable core [2023-04-01 08:56:20,040 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:20,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-01 08:56:21,507 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:56:21,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 19 [2023-04-01 08:56:21,690 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 4 proven. 80 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:21,690 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:25,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 98 [2023-04-01 08:56:25,740 INFO L321 Elim1Store]: treesize reduction 16, result has 67.3 percent of original size [2023-04-01 08:56:25,741 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 182 treesize of output 167 [2023-04-01 08:56:25,830 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:25,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [164709773] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:25,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057897958] [2023-04-01 08:56:25,831 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:56:25,831 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:25,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:25,832 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:25,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:25,853 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:56:26,379 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:56:26,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:26,397 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:27,551 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4535#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#memory_int)_BEFORE_CALL_8| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_8| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_8| Int) (|v_old(#length)_BEFORE_CALL_8| (Array Int Int))) (and (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_8|)) (not (= |v_old(#valid)_BEFORE_CALL_8| |v_old(#length)_BEFORE_CALL_8|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_8|)) (= 12 (select |v_old(#length)_BEFORE_CALL_8| 2)) (= 12 (select |v_old(#length)_BEFORE_CALL_8| 3)) (not (= |v_old(#length)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_8|)) (= (select |v_old(#valid)_BEFORE_CALL_8| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_8| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_8| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 0) 48) (not (= |v_old(#valid)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (= (select |v_old(#valid)_BEFORE_CALL_8| |v_main_~#a~0.base_BEFORE_CALL_8|) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 1) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_8|)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_8|)) (= (select |v_old(#valid)_BEFORE_CALL_8| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_8| 2) 1))) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:27,551 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:27,551 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:27,552 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 18, 16] total 68 [2023-04-01 08:56:27,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113700954] [2023-04-01 08:56:27,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:27,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2023-04-01 08:56:27,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:27,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2023-04-01 08:56:27,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=5846, Unknown=0, NotChecked=0, Total=6162 [2023-04-01 08:56:27,554 INFO L87 Difference]: Start difference. First operand 56 states and 64 transitions. Second operand has 68 states, 68 states have (on average 2.073529411764706) internal successors, (141), 66 states have internal predecessors, (141), 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 08:56:33,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:33,943 INFO L93 Difference]: Finished difference Result 150 states and 183 transitions. [2023-04-01 08:56:33,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-04-01 08:56:33,943 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.073529411764706) internal successors, (141), 66 states have internal predecessors, (141), 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 55 [2023-04-01 08:56:33,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:33,944 INFO L225 Difference]: With dead ends: 150 [2023-04-01 08:56:33,944 INFO L226 Difference]: Without dead ends: 145 [2023-04-01 08:56:33,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 116 SyntacticMatches, 20 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3929 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=974, Invalid=12832, Unknown=0, NotChecked=0, Total=13806 [2023-04-01 08:56:33,947 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 26 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 2825 mSolverCounterSat, 449 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 3274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 449 IncrementalHoareTripleChecker+Valid, 2825 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:33,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 232 Invalid, 3274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [449 Valid, 2825 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-04-01 08:56:33,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2023-04-01 08:56:33,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 94. [2023-04-01 08:56:33,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.202247191011236) internal successors, (107), 89 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:33,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 111 transitions. [2023-04-01 08:56:33,966 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 111 transitions. Word has length 55 [2023-04-01 08:56:33,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:33,966 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 111 transitions. [2023-04-01 08:56:33,967 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.073529411764706) internal successors, (141), 66 states have internal predecessors, (141), 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 08:56:33,967 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 111 transitions. [2023-04-01 08:56:33,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-01 08:56:33,970 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:33,970 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:33,989 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 08:56:34,176 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 08:56:34,176 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:34,177 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:34,177 INFO L85 PathProgramCache]: Analyzing trace with hash 1725540449, now seen corresponding path program 9 times [2023-04-01 08:56:34,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:34,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57862774] [2023-04-01 08:56:34,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:34,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:34,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:34,316 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-04-01 08:56:34,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:34,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57862774] [2023-04-01 08:56:34,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57862774] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:34,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139230214] [2023-04-01 08:56:34,316 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:34,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:34,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:34,317 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 08:56:34,319 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 08:56:34,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:34,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:34,388 INFO L262 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:56:34,390 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:34,541 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-04-01 08:56:34,542 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:34,641 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-04-01 08:56:34,641 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139230214] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:34,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1565523422] [2023-04-01 08:56:34,642 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:56:34,642 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:34,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:34,643 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:34,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:34,664 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:56:35,165 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:56:35,180 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:35,182 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:35,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5456#(and (= |__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) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 1) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= 12 (select |v_old(#length)_BEFORE_CALL_9| 2)) (= (select |v_old(#valid)_BEFORE_CALL_9| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_9| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_9| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_9|)) (not (= |v_old(#valid)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= |v_old(#valid)_BEFORE_CALL_9| |v_old(#length)_BEFORE_CALL_9|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 0)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_9|)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= (select |v_old(#valid)_BEFORE_CALL_9| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_9| |v_main_~#a~0.base_BEFORE_CALL_9|) 0) (= (select |v_old(#length)_BEFORE_CALL_9| 1) 2))) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:35,842 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:35,842 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:35,842 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2023-04-01 08:56:35,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420451302] [2023-04-01 08:56:35,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:35,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-04-01 08:56:35,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:35,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-04-01 08:56:35,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1039, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 08:56:35,844 INFO L87 Difference]: Start difference. First operand 94 states and 111 transitions. Second operand has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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 08:56:36,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:36,210 INFO L93 Difference]: Finished difference Result 239 states and 286 transitions. [2023-04-01 08:56:36,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-04-01 08:56:36,210 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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 56 [2023-04-01 08:56:36,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:36,211 INFO L225 Difference]: With dead ends: 239 [2023-04-01 08:56:36,211 INFO L226 Difference]: Without dead ends: 101 [2023-04-01 08:56:36,212 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 138 SyntacticMatches, 9 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=282, Invalid=1698, Unknown=0, NotChecked=0, Total=1980 [2023-04-01 08:56:36,212 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 50 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 326 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 326 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:36,212 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 49 Invalid, 772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [326 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 08:56:36,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-04-01 08:56:36,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 94. [2023-04-01 08:56:36,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.1685393258426966) internal successors, (104), 89 states have internal predecessors, (104), 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 08:56:36,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 108 transitions. [2023-04-01 08:56:36,237 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 108 transitions. Word has length 56 [2023-04-01 08:56:36,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:36,237 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 108 transitions. [2023-04-01 08:56:36,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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 08:56:36,237 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 108 transitions. [2023-04-01 08:56:36,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-01 08:56:36,239 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:36,239 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:36,246 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 08:56:36,444 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 08:56:36,444 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:36,444 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:36,445 INFO L85 PathProgramCache]: Analyzing trace with hash 1791592086, now seen corresponding path program 10 times [2023-04-01 08:56:36,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:36,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776468588] [2023-04-01 08:56:36,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:36,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:36,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:36,562 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-04-01 08:56:36,562 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:36,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776468588] [2023-04-01 08:56:36,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776468588] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:36,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427711472] [2023-04-01 08:56:36,562 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:56:36,563 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:36,563 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:36,563 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 08:56:36,593 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 08:56:36,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:36,662 INFO L262 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:56:36,664 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:36,735 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-04-01 08:56:36,735 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:36,802 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-04-01 08:56:36,802 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427711472] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:36,802 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [393379733] [2023-04-01 08:56:36,803 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-04-01 08:56:36,803 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:36,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:36,803 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:36,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:36,823 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 52 for LOIs [2023-04-01 08:56:37,301 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-01 08:56:37,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:37,317 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:37,865 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6496#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_10| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_10| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_10| Int) (|v_old(#length)_BEFORE_CALL_10| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_10| |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#length)_BEFORE_CALL_10| 3) 12) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 0)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 1)) (not (= |v_old(#valid)_BEFORE_CALL_10| (select |v_old(#memory_int)_BEFORE_CALL_10| 1))) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_10| 1)) (= (select |v_old(#valid)_BEFORE_CALL_10| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 1) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_10| 1) |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#length)_BEFORE_CALL_10| 2) 12) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_10| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_10| |v_main_~#a~0.base_BEFORE_CALL_10|) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 0) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 3)))) (= |__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 08:56:37,866 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:37,866 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:37,866 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-01 08:56:37,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699630027] [2023-04-01 08:56:37,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:37,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:56:37,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:37,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:56:37,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=801, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:56:37,867 INFO L87 Difference]: Start difference. First operand 94 states and 108 transitions. Second operand has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 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 08:56:38,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:38,039 INFO L93 Difference]: Finished difference Result 100 states and 114 transitions. [2023-04-01 08:56:38,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 08:56:38,039 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 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 57 [2023-04-01 08:56:38,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:38,040 INFO L225 Difference]: With dead ends: 100 [2023-04-01 08:56:38,040 INFO L226 Difference]: Without dead ends: 65 [2023-04-01 08:56:38,040 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 144 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=1109, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 08:56:38,041 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 189 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:38,041 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [189 Valid, 34 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:38,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-04-01 08:56:38,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-04-01 08:56:38,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.15) internal successors, (69), 60 states have internal predecessors, (69), 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 08:56:38,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2023-04-01 08:56:38,049 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 57 [2023-04-01 08:56:38,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:38,049 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2023-04-01 08:56:38,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 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 08:56:38,049 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2023-04-01 08:56:38,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-04-01 08:56:38,049 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:38,049 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:38,054 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 08:56:38,254 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 08:56:38,255 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:38,255 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:38,255 INFO L85 PathProgramCache]: Analyzing trace with hash -1334983601, now seen corresponding path program 11 times [2023-04-01 08:56:38,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:38,255 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930402642] [2023-04-01 08:56:38,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:38,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:38,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:43,380 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 7 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:43,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:43,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930402642] [2023-04-01 08:56:43,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930402642] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:43,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57494667] [2023-04-01 08:56:43,380 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:43,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:43,381 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:43,381 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 08:56:43,383 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 08:56:43,471 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 08:56:43,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:43,474 WARN L260 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 187 conjunts are in the unsatisfiable core [2023-04-01 08:56:43,477 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:43,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-01 08:56:47,551 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:47,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 08:56:47,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 08:56:47,553 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:47,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 08:56:47,555 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:47,555 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:47,598 INFO L321 Elim1Store]: treesize reduction 56, result has 41.1 percent of original size [2023-04-01 08:56:47,602 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 3 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 125 treesize of output 63 [2023-04-01 08:56:47,838 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 5 proven. 120 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:56:47,838 INFO L327 TraceCheckSpWp]: Computing backward predicates...