/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain EqDomain -i ../sv-benchmarks/c/array-crafted/zero_sum_m2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 08:56:38,587 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 08:56:38,590 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 08:56:38,622 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 08:56:38,623 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 08:56:38,623 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 08:56:38,629 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 08:56:38,634 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 08:56:38,635 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 08:56:38,640 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 08:56:38,641 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 08:56:38,643 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 08:56:38,643 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 08:56:38,646 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 08:56:38,646 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 08:56:38,651 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 08:56:38,652 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 08:56:38,652 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 08:56:38,655 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 08:56:38,660 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 08:56:38,660 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 08:56:38,661 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 08:56:38,663 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 08:56:38,664 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 08:56:38,670 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 08:56:38,670 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 08:56:38,670 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 08:56:38,671 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 08:56:38,671 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 08:56:38,672 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 08:56:38,672 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 08:56:38,672 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 08:56:38,673 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 08:56:38,673 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 08:56:38,674 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 08:56:38,674 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 08:56:38,675 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 08:56:38,675 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 08:56:38,675 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 08:56:38,676 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 08:56:38,676 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 08:56:38,680 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 08:56:38,710 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 08:56:38,710 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 08:56:38,710 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 08:56:38,711 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 08:56:38,711 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 08:56:38,711 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 08:56:38,712 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 08:56:38,712 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 08:56:38,712 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 08:56:38,712 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 08:56:38,713 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 08:56:38,713 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 08:56:38,713 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 08:56:38,713 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 08:56:38,713 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 08:56:38,713 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 08:56:38,713 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 08:56:38,713 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 08:56:38,714 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 08:56:38,714 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 08:56:38,714 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 08:56:38,714 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 08:56:38,714 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 08:56:38,714 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 08:56:38,715 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 08:56:38,715 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 08:56:38,715 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 08:56:38,715 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 08:56:38,715 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 08:56:38,715 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 08:56:38,715 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 08:56:38,716 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 08:56:38,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:56:38,716 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 08:56:38,716 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 08:56:38,716 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 08:56:38,716 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 08:56:38,716 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 08:56:38,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 08:56:38,717 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 08:56:38,717 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 08:56:38,717 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 08:56:38,970 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 08:56:38,987 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 08:56:38,989 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 08:56:38,990 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 08:56:38,990 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 08:56:38,991 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum_m2.c [2023-04-01 08:56:40,132 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 08:56:40,327 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 08:56:40,327 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_m2.c [2023-04-01 08:56:40,333 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9197040da/140284240fc749d388c95d3dab500764/FLAGc9a4c82ae [2023-04-01 08:56:40,348 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9197040da/140284240fc749d388c95d3dab500764 [2023-04-01 08:56:40,351 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 08:56:40,352 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 08:56:40,355 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 08:56:40,355 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 08:56:40,358 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 08:56:40,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,360 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45d349b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40, skipping insertion in model container [2023-04-01 08:56:40,360 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,366 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 08:56:40,378 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 08:56:40,528 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2023-04-01 08:56:40,547 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:56:40,555 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 08:56:40,568 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2023-04-01 08:56:40,576 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 08:56:40,588 INFO L208 MainTranslator]: Completed translation [2023-04-01 08:56:40,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40 WrapperNode [2023-04-01 08:56:40,588 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 08:56:40,589 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 08:56:40,589 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 08:56:40,589 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 08:56:40,600 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,600 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,605 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,606 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,610 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,614 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,615 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,616 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,617 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 08:56:40,618 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 08:56:40,618 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 08:56:40,618 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 08:56:40,619 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (1/1) ... [2023-04-01 08:56:40,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 08:56:40,632 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:40,644 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 08:56:40,665 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 08:56:40,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 08:56:40,679 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 08:56:40,680 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 08:56:40,680 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 08:56:40,680 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 08:56:40,680 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 08:56:40,680 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 08:56:40,680 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 08:56:40,680 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 08:56:40,680 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 08:56:40,681 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 08:56:40,681 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 08:56:40,681 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2023-04-01 08:56:40,681 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 08:56:40,681 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-01 08:56:40,681 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 08:56:40,681 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 08:56:40,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 08:56:40,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 08:56:40,682 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 08:56:40,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 08:56:40,740 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 08:56:40,742 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 08:56:40,946 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 08:56:40,998 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 08:56:40,998 INFO L302 CfgBuilder]: Removed 5 assume(true) statements. [2023-04-01 08:56:41,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:56:41 BoogieIcfgContainer [2023-04-01 08:56:41,001 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 08:56:41,003 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 08:56:41,003 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 08:56:41,005 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 08:56:41,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 08:56:40" (1/3) ... [2023-04-01 08:56:41,006 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9c9f12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:56:41, skipping insertion in model container [2023-04-01 08:56:41,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 08:56:40" (2/3) ... [2023-04-01 08:56:41,006 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9c9f12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 08:56:41, skipping insertion in model container [2023-04-01 08:56:41,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 08:56:41" (3/3) ... [2023-04-01 08:56:41,007 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m2.c [2023-04-01 08:56:41,022 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 08:56:41,022 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 08:56:41,060 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 08:56:41,066 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;@1aab80d4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 08:56:41,066 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 08:56:41,069 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 08:56:41,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-01 08:56:41,076 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:41,076 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:41,077 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:41,085 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:41,086 INFO L85 PathProgramCache]: Analyzing trace with hash -1747742048, now seen corresponding path program 1 times [2023-04-01 08:56:41,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:41,126 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387660576] [2023-04-01 08:56:41,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:41,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:41,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:41,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:41,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:41,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387660576] [2023-04-01 08:56:41,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387660576] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:56:41,433 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:56:41,433 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 08:56:41,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097220002] [2023-04-01 08:56:41,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:56:41,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 08:56:41,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:41,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 08:56:41,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:56:41,473 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 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 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 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 08:56:41,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:41,546 INFO L93 Difference]: Finished difference Result 40 states and 52 transitions. [2023-04-01 08:56:41,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 08:56:41,549 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 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 15 [2023-04-01 08:56:41,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:41,554 INFO L225 Difference]: With dead ends: 40 [2023-04-01 08:56:41,555 INFO L226 Difference]: Without dead ends: 17 [2023-04-01 08:56:41,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 08:56:41,562 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:41,563 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:41,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-04-01 08:56:41,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-04-01 08:56:41,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 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 08:56:41,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-04-01 08:56:41,597 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 15 [2023-04-01 08:56:41,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:41,599 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-04-01 08:56:41,599 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 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 08:56:41,599 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-04-01 08:56:41,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-01 08:56:41,601 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:41,601 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:41,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 08:56:41,601 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:41,603 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:41,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1215019542, now seen corresponding path program 1 times [2023-04-01 08:56:41,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:41,604 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11744551] [2023-04-01 08:56:41,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:41,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:41,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:41,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 08:56:41,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:41,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11744551] [2023-04-01 08:56:41,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11744551] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 08:56:41,739 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 08:56:41,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 08:56:41,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002370770] [2023-04-01 08:56:41,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 08:56:41,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 08:56:41,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:41,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 08:56:41,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 08:56:41,742 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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 08:56:41,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:41,791 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2023-04-01 08:56:41,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 08:56:41,791 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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 16 [2023-04-01 08:56:41,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:41,792 INFO L225 Difference]: With dead ends: 29 [2023-04-01 08:56:41,793 INFO L226 Difference]: Without dead ends: 21 [2023-04-01 08:56:41,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-01 08:56:41,799 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:41,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:41,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-01 08:56:41,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-04-01 08:56:41,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:41,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-04-01 08:56:41,814 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 16 [2023-04-01 08:56:41,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:41,814 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-04-01 08:56:41,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 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 08:56:41,815 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-04-01 08:56:41,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-01 08:56:41,815 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:41,815 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 08:56:41,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 08:56:41,815 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:41,816 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:41,816 INFO L85 PathProgramCache]: Analyzing trace with hash 784043139, now seen corresponding path program 1 times [2023-04-01 08:56:41,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:41,816 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094442363] [2023-04-01 08:56:41,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:41,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:41,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:41,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 08:56:41,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:41,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094442363] [2023-04-01 08:56:41,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094442363] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:41,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414132625] [2023-04-01 08:56:41,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:41,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:41,918 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:41,921 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:41,922 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 08:56:41,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:41,989 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:56:41,995 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:42,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 08:56:42,048 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:42,074 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 08:56:42,075 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414132625] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:42,075 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1070662613] [2023-04-01 08:56:42,114 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:56:42,114 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:42,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:42,123 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:42,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:42,327 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:43,491 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:43,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:43,553 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:44,284 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '331#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_1| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_1| Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_1| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_1| |v_old(#length)_BEFORE_CALL_1|)) (= (select |v_old(#length)_BEFORE_CALL_1| 3) 12) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#valid)_BEFORE_CALL_1|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_1| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_1| 2) 14) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_1|)) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_1|)) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_1| |v_main_~#a~0.base_BEFORE_CALL_1|) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_1|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_1|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:44,284 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:44,285 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:44,285 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 08:56:44,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616213475] [2023-04-01 08:56:44,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:44,286 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 08:56:44,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:44,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 08:56:44,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:56:44,287 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 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 08:56:44,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:44,331 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2023-04-01 08:56:44,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 08:56:44,333 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 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 08:56:44,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:44,334 INFO L225 Difference]: With dead ends: 35 [2023-04-01 08:56:44,334 INFO L226 Difference]: Without dead ends: 22 [2023-04-01 08:56:44,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-04-01 08:56:44,335 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:44,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 30 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:44,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-01 08:56:44,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-01 08:56:44,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 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 08:56:44,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-04-01 08:56:44,339 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2023-04-01 08:56:44,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:44,339 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-04-01 08:56:44,339 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 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 08:56:44,339 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-04-01 08:56:44,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 08:56:44,340 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:44,340 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] [2023-04-01 08:56:44,350 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:44,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:44,548 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:44,549 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:44,549 INFO L85 PathProgramCache]: Analyzing trace with hash -658942087, now seen corresponding path program 2 times [2023-04-01 08:56:44,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:44,549 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801600367] [2023-04-01 08:56:44,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:44,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:44,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:44,646 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:44,646 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:44,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801600367] [2023-04-01 08:56:44,646 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801600367] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:44,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378670964] [2023-04-01 08:56:44,646 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:44,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:44,647 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:44,648 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:56:44,676 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 08:56:44,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 08:56:44,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:44,723 INFO L262 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 08:56:44,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:44,777 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:44,777 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:44,805 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:44,805 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378670964] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:44,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [659486395] [2023-04-01 08:56:44,808 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:56:44,808 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:44,809 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:44,809 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:44,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:44,860 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:45,464 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:45,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:45,496 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:46,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '574#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_2| Int) (|v_old(#valid)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_2| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_2| (Array Int (Array Int Int)))) (and (= 2 (select |v_old(#length)_BEFORE_CALL_2| 1)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#length)_BEFORE_CALL_2| 3) 12) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 1) 0) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_2|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 0) 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_2| 1) 0)) (not (= |v_old(#length)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (= (select |v_old(#length)_BEFORE_CALL_2| 2) 14) (not (= |v_old(#valid)_BEFORE_CALL_2| (select |v_old(#memory_int)_BEFORE_CALL_2| 1))) (not (= |v_old(#valid)_BEFORE_CALL_2| |v_old(#length)_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_2| |v_main_~#a~0.base_BEFORE_CALL_2|) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_2|)) (= (select |v_old(#valid)_BEFORE_CALL_2| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_2| 1) 1))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:46,174 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:46,174 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:46,174 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-04-01 08:56:46,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380383962] [2023-04-01 08:56:46,175 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:46,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 08:56:46,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:46,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 08:56:46,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-04-01 08:56:46,176 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:46,221 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2023-04-01 08:56:46,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 08:56:46,225 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 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 21 [2023-04-01 08:56:46,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:46,225 INFO L225 Difference]: With dead ends: 37 [2023-04-01 08:56:46,226 INFO L226 Difference]: Without dead ends: 26 [2023-04-01 08:56:46,226 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-04-01 08:56:46,227 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:46,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 24 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 08:56:46,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-01 08:56:46,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-04-01 08:56:46,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2023-04-01 08:56:46,231 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 21 [2023-04-01 08:56:46,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:46,231 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2023-04-01 08:56:46,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:46,231 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2023-04-01 08:56:46,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 08:56:46,232 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:46,232 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:46,241 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-01 08:56:46,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-04-01 08:56:46,439 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:46,439 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:46,439 INFO L85 PathProgramCache]: Analyzing trace with hash -1473161856, now seen corresponding path program 3 times [2023-04-01 08:56:46,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:46,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617212496] [2023-04-01 08:56:46,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:46,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:46,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:47,561 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:47,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:47,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617212496] [2023-04-01 08:56:47,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617212496] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:47,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488452507] [2023-04-01 08:56:47,562 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:47,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:47,562 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:47,563 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 08:56:47,566 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 08:56:47,627 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:47,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:47,629 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-01 08:56:47,633 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:47,688 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 08:56:47,909 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:47,911 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:56:47,911 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 08:56:47,968 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:47,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:48,342 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 08:56:48,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488452507] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:48,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [78427031] [2023-04-01 08:56:48,345 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:56:48,346 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:48,346 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:48,346 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:48,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:48,383 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:48,939 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:48,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:48,969 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:50,048 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '874#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int) (|v_old(#length)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_3| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_3| (Array Int (Array Int Int)))) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 0) 48) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= (select |v_old(#length)_BEFORE_CALL_3| 2) 14) (= (select (select |v_old(#memory_int)_BEFORE_CALL_3| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_3| 0) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_3|)) (not (= |v_old(#valid)_BEFORE_CALL_3| |v_old(#length)_BEFORE_CALL_3|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_3|)) (= 2 (select |v_old(#length)_BEFORE_CALL_3| 1)) (= (select |v_old(#length)_BEFORE_CALL_3| 3) 12) (not (= |v_old(#length)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) (not (= |v_old(#valid)_BEFORE_CALL_3| (select |v_old(#memory_int)_BEFORE_CALL_3| 1))) (= (select |v_old(#valid)_BEFORE_CALL_3| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_3| 3) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_3|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:50,049 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:50,049 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:50,049 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 15] total 29 [2023-04-01 08:56:50,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339624449] [2023-04-01 08:56:50,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:50,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-01 08:56:50,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:50,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-01 08:56:50,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1450, Unknown=0, NotChecked=0, Total=1560 [2023-04-01 08:56:50,052 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 27 states have internal predecessors, (37), 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 08:56:50,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:50,344 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2023-04-01 08:56:50,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-01 08:56:50,346 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 27 states have internal predecessors, (37), 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 25 [2023-04-01 08:56:50,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:50,346 INFO L225 Difference]: With dead ends: 41 [2023-04-01 08:56:50,347 INFO L226 Difference]: Without dead ends: 36 [2023-04-01 08:56:50,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 45 SyntacticMatches, 10 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2023-04-01 08:56:50,348 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:50,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 124 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 08:56:50,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-01 08:56:50,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2023-04-01 08:56:50,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 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 08:56:50,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2023-04-01 08:56:50,356 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2023-04-01 08:56:50,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:50,356 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2023-04-01 08:56:50,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 27 states have internal predecessors, (37), 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 08:56:50,357 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2023-04-01 08:56:50,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-01 08:56:50,357 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:50,357 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:50,371 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:50,565 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 08:56:50,566 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:50,566 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:50,566 INFO L85 PathProgramCache]: Analyzing trace with hash -1548530666, now seen corresponding path program 4 times [2023-04-01 08:56:50,566 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:50,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688369945] [2023-04-01 08:56:50,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:50,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:50,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:50,661 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 08:56:50,661 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:50,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688369945] [2023-04-01 08:56:50,661 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688369945] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:50,661 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470224151] [2023-04-01 08:56:50,662 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:56:50,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:50,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:50,663 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 08:56:50,669 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 08:56:50,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:50,724 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:56:50,726 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:50,787 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 08:56:50,787 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:50,840 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 08:56:50,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470224151] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:50,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1422496702] [2023-04-01 08:56:50,842 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:56:50,842 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:50,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:50,843 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:50,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:50,874 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:51,363 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:51,388 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:51,392 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:51,992 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1191#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_4| Int) (|v_old(#memory_int)_BEFORE_CALL_4| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_4| (Array Int Int)) (|v_old(#length)_BEFORE_CALL_4| (Array Int Int))) (and (= (select |v_old(#length)_BEFORE_CALL_4| 1) 2) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_4|)) (= (select |v_old(#length)_BEFORE_CALL_4| 2) 14) (= (select |v_old(#valid)_BEFORE_CALL_4| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_4| 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_4| |v_old(#length)_BEFORE_CALL_4|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_4| 1) |v_old(#length)_BEFORE_CALL_4|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 1) 0) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_4|)) (= (select |v_old(#valid)_BEFORE_CALL_4| |v_main_~#a~0.base_BEFORE_CALL_4|) 0) (= (select |v_old(#valid)_BEFORE_CALL_4| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_4| 3) 12) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_4|)) (not (= |v_old(#valid)_BEFORE_CALL_4| (select |v_old(#memory_int)_BEFORE_CALL_4| 1))) (= (select |v_old(#valid)_BEFORE_CALL_4| 2) 1) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_4| 1) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:51,992 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:51,993 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:51,993 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-01 08:56:51,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876798242] [2023-04-01 08:56:51,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:51,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 08:56:51,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:51,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 08:56:51,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2023-04-01 08:56:51,997 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 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 08:56:52,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:52,121 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2023-04-01 08:56:52,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 08:56:52,123 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 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 26 [2023-04-01 08:56:52,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:52,123 INFO L225 Difference]: With dead ends: 62 [2023-04-01 08:56:52,123 INFO L226 Difference]: Without dead ends: 35 [2023-04-01 08:56:52,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=111, Invalid=645, Unknown=0, NotChecked=0, Total=756 [2023-04-01 08:56:52,125 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:52,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 45 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:52,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-01 08:56:52,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-04-01 08:56:52,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 states have internal predecessors, (38), 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 08:56:52,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2023-04-01 08:56:52,134 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 26 [2023-04-01 08:56:52,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:52,134 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2023-04-01 08:56:52,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 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 08:56:52,135 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2023-04-01 08:56:52,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-01 08:56:52,135 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:52,135 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:52,144 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:52,336 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 08:56:52,336 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:52,336 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:52,336 INFO L85 PathProgramCache]: Analyzing trace with hash -1678866804, now seen corresponding path program 5 times [2023-04-01 08:56:52,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:52,337 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952260994] [2023-04-01 08:56:52,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:52,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:52,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:52,426 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 08:56:52,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:52,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952260994] [2023-04-01 08:56:52,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952260994] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:52,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227195037] [2023-04-01 08:56:52,427 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:56:52,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:52,427 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:52,428 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 08:56:52,440 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 08:56:52,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:56:52,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:52,492 INFO L262 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 08:56:52,493 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:52,545 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 08:56:52,545 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:52,595 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 08:56:52,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227195037] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:52,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1883139392] [2023-04-01 08:56:52,597 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:56:52,597 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:52,597 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:52,597 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:52,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:52,629 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:53,174 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:53,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:53,198 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:53,762 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1562#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_5| Int) (|v_old(#memory_int)_BEFORE_CALL_5| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_5| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_5| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_5| (select |v_old(#memory_int)_BEFORE_CALL_5| 1))) (= (select |v_old(#valid)_BEFORE_CALL_5| 1) 1) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= 14 (select |v_old(#length)_BEFORE_CALL_5| 2)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= (select |v_old(#length)_BEFORE_CALL_5| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_5| 2) 1) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_5| 1) 1) 0) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| |v_main_~#a~0.base_BEFORE_CALL_5|) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_5| 1) |v_old(#length)_BEFORE_CALL_5|)) (= (select |v_old(#valid)_BEFORE_CALL_5| 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_5| 3) 1) (not (= |v_old(#valid)_BEFORE_CALL_5| |v_old(#length)_BEFORE_CALL_5|)) (= 2 (select |v_old(#length)_BEFORE_CALL_5| 1)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_5|)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:53,762 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:53,762 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:53,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-01 08:56:53,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090022132] [2023-04-01 08:56:53,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:53,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 08:56:53,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:53,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 08:56:53,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=519, Unknown=0, NotChecked=0, Total=600 [2023-04-01 08:56:53,764 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:53,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:53,868 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2023-04-01 08:56:53,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 08:56:53,868 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 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 27 [2023-04-01 08:56:53,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:53,869 INFO L225 Difference]: With dead ends: 50 [2023-04-01 08:56:53,869 INFO L226 Difference]: Without dead ends: 31 [2023-04-01 08:56:53,870 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2023-04-01 08:56:53,870 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 72 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:53,871 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 38 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:56:53,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-04-01 08:56:53,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-04-01 08:56:53,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:53,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-04-01 08:56:53,876 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 27 [2023-04-01 08:56:53,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:53,876 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-04-01 08:56:53,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:53,877 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-04-01 08:56:53,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 08:56:53,877 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:53,877 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:53,884 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-01 08:56:54,081 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 08:56:54,081 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:54,081 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:54,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1549928483, now seen corresponding path program 6 times [2023-04-01 08:56:54,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:54,082 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119348888] [2023-04-01 08:56:54,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:54,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:54,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:55,695 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:55,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:55,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119348888] [2023-04-01 08:56:55,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119348888] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:55,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762478922] [2023-04-01 08:56:55,696 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:56:55,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:55,696 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:55,697 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 08:56:55,719 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 08:56:55,767 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:56:55,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:56:55,769 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 66 conjunts are in the unsatisfiable core [2023-04-01 08:56:55,773 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:55,796 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 08:56:56,256 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:56,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 08:56:56,257 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 08:56:56,261 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 08:56:56,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 23 [2023-04-01 08:56:56,337 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:56:56,337 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:56,985 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 08:56:56,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762478922] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:56,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [362509865] [2023-04-01 08:56:56,987 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:56:56,987 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:56,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:56,987 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:56,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:57,016 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:56:57,479 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:56:57,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:56:57,503 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:56:58,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1956#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#valid)_BEFORE_CALL_6| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_6| (Array Int (Array Int Int))) (|v_main_~#a~0.base_BEFORE_CALL_6| Int) (|v_old(#length)_BEFORE_CALL_6| (Array Int Int))) (and (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_6| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_6| 3) 12) (= (select |v_old(#valid)_BEFORE_CALL_6| |v_main_~#a~0.base_BEFORE_CALL_6|) 0) (not (= |v_old(#valid)_BEFORE_CALL_6| |v_old(#length)_BEFORE_CALL_6|)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_6|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_6| 1) 0) 48) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_6|)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_6| 1) |v_old(#length)_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 2) 1) (= 14 (select |v_old(#length)_BEFORE_CALL_6| 2)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#length)_BEFORE_CALL_6| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_6| (select |v_old(#memory_int)_BEFORE_CALL_6| 1))) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_6|)) (= (select |v_old(#valid)_BEFORE_CALL_6| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_6| 0) 0))) (= |#NULL.base| 0))' at error location [2023-04-01 08:56:58,427 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:56:58,427 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:56:58,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 19] total 49 [2023-04-01 08:56:58,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127662479] [2023-04-01 08:56:58,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:56:58,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-01 08:56:58,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:56:58,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-01 08:56:58,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=3350, Unknown=0, NotChecked=0, Total=3540 [2023-04-01 08:56:58,431 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 47 states have internal predecessors, (60), 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 08:56:59,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:56:59,369 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2023-04-01 08:56:59,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-01 08:56:59,369 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 47 states have internal predecessors, (60), 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 30 [2023-04-01 08:56:59,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:56:59,370 INFO L225 Difference]: With dead ends: 49 [2023-04-01 08:56:59,370 INFO L226 Difference]: Without dead ends: 44 [2023-04-01 08:56:59,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 48 SyntacticMatches, 7 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=263, Invalid=4429, Unknown=0, NotChecked=0, Total=4692 [2023-04-01 08:56:59,372 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 829 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 829 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-01 08:56:59,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 173 Invalid, 844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 829 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-01 08:56:59,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-04-01 08:56:59,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2023-04-01 08:56:59,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 36 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:56:59,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2023-04-01 08:56:59,380 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 30 [2023-04-01 08:56:59,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:56:59,380 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2023-04-01 08:56:59,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 47 states have internal predecessors, (60), 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 08:56:59,380 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2023-04-01 08:56:59,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-01 08:56:59,381 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:56:59,381 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:56:59,391 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 08:56:59,591 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 08:56:59,592 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:56:59,592 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:56:59,592 INFO L85 PathProgramCache]: Analyzing trace with hash -2043643645, now seen corresponding path program 7 times [2023-04-01 08:56:59,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:56:59,592 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367343195] [2023-04-01 08:56:59,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:56:59,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:56:59,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:59,714 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:59,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:56:59,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367343195] [2023-04-01 08:56:59,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367343195] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:56:59,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705651664] [2023-04-01 08:56:59,715 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:56:59,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:56:59,715 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:56:59,716 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 08:56:59,739 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 08:56:59,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:56:59,792 INFO L262 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 08:56:59,796 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:56:59,864 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:59,864 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:56:59,918 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-01 08:56:59,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705651664] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:56:59,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745031837] [2023-04-01 08:56:59,922 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:56:59,922 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:56:59,922 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:56:59,922 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:56:59,922 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:56:59,964 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:00,463 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:00,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:00,490 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:01,133 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2352#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#valid)_BEFORE_CALL_7| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_7| (Array Int (Array Int Int))) (|v_main_~#a~0.base_BEFORE_CALL_7| Int) (|v_old(#length)_BEFORE_CALL_7| (Array Int Int))) (and (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 1) 1) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_7|)) (= 14 (select |v_old(#length)_BEFORE_CALL_7| 2)) (= (select |v_old(#valid)_BEFORE_CALL_7| 2) 1) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 1) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_7| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_7| 3) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#valid)_BEFORE_CALL_7|)) (= 2 (select |v_old(#length)_BEFORE_CALL_7| 1)) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_7|)) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_7|)) (= (select |v_old(#valid)_BEFORE_CALL_7| |v_main_~#a~0.base_BEFORE_CALL_7|) 0) (= (select |v_old(#length)_BEFORE_CALL_7| 3) 12) (not (= (select |v_old(#memory_int)_BEFORE_CALL_7| 1) |v_old(#length)_BEFORE_CALL_7|)) (not (= |v_old(#valid)_BEFORE_CALL_7| |v_old(#length)_BEFORE_CALL_7|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:01,133 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:01,133 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:01,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-04-01 08:57:01,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220028774] [2023-04-01 08:57:01,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:01,134 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 08:57:01,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:01,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 08:57:01,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2023-04-01 08:57:01,135 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:01,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:01,283 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2023-04-01 08:57:01,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 08:57:01,284 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 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 31 [2023-04-01 08:57:01,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:01,284 INFO L225 Difference]: With dead ends: 76 [2023-04-01 08:57:01,284 INFO L226 Difference]: Without dead ends: 42 [2023-04-01 08:57:01,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 70 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992 [2023-04-01 08:57:01,285 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:01,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 41 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:01,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-04-01 08:57:01,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-04-01 08:57:01,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 37 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:01,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2023-04-01 08:57:01,295 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 31 [2023-04-01 08:57:01,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:01,295 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2023-04-01 08:57:01,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:01,296 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2023-04-01 08:57:01,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-01 08:57:01,301 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:01,301 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:01,309 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:01,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:01,502 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:01,502 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:01,502 INFO L85 PathProgramCache]: Analyzing trace with hash 1027954765, now seen corresponding path program 8 times [2023-04-01 08:57:01,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:01,502 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903843067] [2023-04-01 08:57:01,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:01,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:01,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:01,650 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-01 08:57:01,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:01,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903843067] [2023-04-01 08:57:01,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903843067] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:01,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873906904] [2023-04-01 08:57:01,651 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:57:01,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:01,651 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:01,652 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:01,654 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 08:57:01,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 08:57:01,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:01,723 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 08:57:01,724 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:01,829 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-01 08:57:01,829 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:01,905 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-01 08:57:01,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873906904] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:01,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [115673940] [2023-04-01 08:57:01,907 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:57:01,907 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:01,907 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:01,907 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:01,907 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:01,941 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:02,415 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:02,439 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:02,443 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:03,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2803#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#memory_int)_BEFORE_CALL_8| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_8| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_8| Int) (|v_old(#length)_BEFORE_CALL_8| (Array Int Int))) (and (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_8|)) (not (= |v_old(#valid)_BEFORE_CALL_8| |v_old(#length)_BEFORE_CALL_8|)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_8|)) (= 12 (select |v_old(#length)_BEFORE_CALL_8| 3)) (not (= |v_old(#length)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_8|)) (= (select |v_old(#valid)_BEFORE_CALL_8| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_8| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_8| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 0) 48) (not (= |v_old(#valid)_BEFORE_CALL_8| (select |v_old(#memory_int)_BEFORE_CALL_8| 1))) (= (select |v_old(#valid)_BEFORE_CALL_8| |v_main_~#a~0.base_BEFORE_CALL_8|) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_8| 1) 1) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_8|)) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_8|)) (= 14 (select |v_old(#length)_BEFORE_CALL_8| 2)) (= (select |v_old(#valid)_BEFORE_CALL_8| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_8| 2) 1))) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:03,049 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:03,049 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:03,049 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2023-04-01 08:57:03,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280807672] [2023-04-01 08:57:03,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:03,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:57:03,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:03,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:57:03,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=818, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:57:03,051 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:03,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:03,251 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2023-04-01 08:57:03,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 08:57:03,251 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2023-04-01 08:57:03,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:03,251 INFO L225 Difference]: With dead ends: 59 [2023-04-01 08:57:03,252 INFO L226 Difference]: Without dead ends: 36 [2023-04-01 08:57:03,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 8 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=189, Invalid=1143, Unknown=0, NotChecked=0, Total=1332 [2023-04-01 08:57:03,253 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 74 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:03,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 58 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:03,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-01 08:57:03,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-04-01 08:57:03,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 31 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:03,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2023-04-01 08:57:03,258 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 32 [2023-04-01 08:57:03,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:03,259 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2023-04-01 08:57:03,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:03,259 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2023-04-01 08:57:03,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-01 08:57:03,260 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:03,260 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:03,272 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:03,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-01 08:57:03,472 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:03,472 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:03,472 INFO L85 PathProgramCache]: Analyzing trace with hash 933257312, now seen corresponding path program 9 times [2023-04-01 08:57:03,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:03,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561130837] [2023-04-01 08:57:03,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:03,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:03,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:05,627 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:05,628 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:05,628 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561130837] [2023-04-01 08:57:05,628 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561130837] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:05,628 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152554946] [2023-04-01 08:57:05,628 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:57:05,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:05,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:05,629 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:05,630 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 08:57:05,706 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:57:05,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:05,708 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 86 conjunts are in the unsatisfiable core [2023-04-01 08:57:05,711 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:05,762 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 08:57:06,482 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:06,482 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:07,557 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-01 08:57:07,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152554946] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:07,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140309574] [2023-04-01 08:57:07,559 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:57:07,559 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:07,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:07,559 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:07,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:07,591 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:08,035 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:08,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:08,062 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:09,195 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3278#(and (exists ((|v_old(#valid)_BEFORE_CALL_9| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_9| Int) (|v_old(#length)_BEFORE_CALL_9| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_9| (Array Int (Array Int Int)))) (and (= (select |v_old(#valid)_BEFORE_CALL_9| 1) 1) (not (= 0 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 1) 0) (not (= 1 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= (select |v_old(#valid)_BEFORE_CALL_9| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_9| 3) 12) (= 14 (select |v_old(#length)_BEFORE_CALL_9| 2)) (= (select |v_old(#valid)_BEFORE_CALL_9| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_9|)) (not (= |v_old(#valid)_BEFORE_CALL_9| (select |v_old(#memory_int)_BEFORE_CALL_9| 1))) (not (= |v_old(#valid)_BEFORE_CALL_9| |v_old(#length)_BEFORE_CALL_9|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_9| 1) 0)) (not (= 2 |v_main_~#a~0.base_BEFORE_CALL_9|)) (not (= 3 |v_main_~#a~0.base_BEFORE_CALL_9|)) (= (select |v_old(#valid)_BEFORE_CALL_9| 3) 1) (= (select |v_old(#valid)_BEFORE_CALL_9| |v_main_~#a~0.base_BEFORE_CALL_9|) 0) (= (select |v_old(#length)_BEFORE_CALL_9| 1) 2))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:09,195 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:09,195 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:09,195 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27, 23] total 63 [2023-04-01 08:57:09,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845556566] [2023-04-01 08:57:09,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:09,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2023-04-01 08:57:09,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:09,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2023-04-01 08:57:09,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=5165, Unknown=0, NotChecked=0, Total=5402 [2023-04-01 08:57:09,198 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 61 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:11,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:11,090 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2023-04-01 08:57:11,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-01 08:57:11,097 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 61 states have internal predecessors, (74), 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 35 [2023-04-01 08:57:11,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:11,099 INFO L225 Difference]: With dead ends: 63 [2023-04-01 08:57:11,099 INFO L226 Difference]: Without dead ends: 58 [2023-04-01 08:57:11,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2191 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=411, Invalid=8145, Unknown=0, NotChecked=0, Total=8556 [2023-04-01 08:57:11,103 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 1314 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 1339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 1314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:11,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 237 Invalid, 1339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 1314 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-04-01 08:57:11,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-04-01 08:57:11,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2023-04-01 08:57:11,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 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 08:57:11,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2023-04-01 08:57:11,120 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 35 [2023-04-01 08:57:11,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:11,120 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2023-04-01 08:57:11,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 61 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:11,121 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2023-04-01 08:57:11,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-01 08:57:11,121 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:11,121 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:11,126 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:11,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:11,325 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:11,325 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:11,326 INFO L85 PathProgramCache]: Analyzing trace with hash 1732233910, now seen corresponding path program 10 times [2023-04-01 08:57:11,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:11,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816570937] [2023-04-01 08:57:11,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:11,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:11,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:11,471 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:57:11,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:11,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816570937] [2023-04-01 08:57:11,472 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1816570937] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:11,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094288492] [2023-04-01 08:57:11,472 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:57:11,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:11,473 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:11,473 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:11,492 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-01 08:57:11,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:11,547 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:57:11,550 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:11,709 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:57:11,709 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:11,782 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-01 08:57:11,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094288492] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:11,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1894005767] [2023-04-01 08:57:11,784 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:57:11,784 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:11,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:11,784 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:11,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:11,814 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:12,266 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:12,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:12,292 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:12,909 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3769#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_old(#memory_int)_BEFORE_CALL_10| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_10| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_10| Int) (|v_old(#length)_BEFORE_CALL_10| (Array Int Int))) (and (not (= |v_old(#valid)_BEFORE_CALL_10| |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#length)_BEFORE_CALL_10| 3) 12) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 0)) (= (select |v_old(#length)_BEFORE_CALL_10| 2) 14) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 1)) (not (= |v_old(#valid)_BEFORE_CALL_10| (select |v_old(#memory_int)_BEFORE_CALL_10| 1))) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_10| 1)) (= (select |v_old(#valid)_BEFORE_CALL_10| 3) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 1) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_10| 1) |v_old(#length)_BEFORE_CALL_10|)) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_10| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_10| |v_main_~#a~0.base_BEFORE_CALL_10|) 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 0) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_10| 3)))) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:12,909 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:12,909 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:12,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-01 08:57:12,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138653537] [2023-04-01 08:57:12,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:12,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 08:57:12,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:12,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 08:57:12,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2023-04-01 08:57:12,911 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:13,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:13,090 INFO L93 Difference]: Finished difference Result 90 states and 104 transitions. [2023-04-01 08:57:13,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 08:57:13,091 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 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 36 [2023-04-01 08:57:13,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:13,091 INFO L225 Difference]: With dead ends: 90 [2023-04-01 08:57:13,091 INFO L226 Difference]: Without dead ends: 49 [2023-04-01 08:57:13,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 82 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=190, Invalid=1070, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 08:57:13,093 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:13,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 65 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:13,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-01 08:57:13,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-04-01 08:57:13,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:13,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2023-04-01 08:57:13,102 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 36 [2023-04-01 08:57:13,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:13,103 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2023-04-01 08:57:13,103 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:13,103 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2023-04-01 08:57:13,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 08:57:13,103 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:13,103 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:13,108 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:13,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-01 08:57:13,305 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:13,305 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:13,305 INFO L85 PathProgramCache]: Analyzing trace with hash 61139372, now seen corresponding path program 11 times [2023-04-01 08:57:13,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:13,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806859571] [2023-04-01 08:57:13,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:13,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:13,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:13,443 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-04-01 08:57:13,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:13,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806859571] [2023-04-01 08:57:13,444 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806859571] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:13,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921648690] [2023-04-01 08:57:13,444 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:57:13,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:13,444 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:13,445 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:13,453 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 08:57:13,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 08:57:13,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:13,534 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 08:57:13,535 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:13,660 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-04-01 08:57:13,660 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:13,755 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-04-01 08:57:13,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921648690] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:13,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1433442435] [2023-04-01 08:57:13,756 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:57:13,756 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:13,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:13,757 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:13,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:13,783 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:14,234 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:14,262 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:14,266 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:14,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4298#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (exists ((|v_old(#memory_int)_BEFORE_CALL_11| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_11| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_11| Int) (|v_old(#length)_BEFORE_CALL_11| (Array Int Int))) (and (not (= |v_main_~#a~0.base_BEFORE_CALL_11| 2)) (not (= |v_old(#valid)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (= (select |v_old(#valid)_BEFORE_CALL_11| |v_main_~#a~0.base_BEFORE_CALL_11|) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_11| |#StackHeapBarrier|)) (= 1 (select |v_old(#valid)_BEFORE_CALL_11| 2)) (not (= |v_main_~#a~0.base_BEFORE_CALL_11| 0)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 1) 0) (= 14 (select |v_old(#length)_BEFORE_CALL_11| 2)) (not (= |v_old(#length)_BEFORE_CALL_11| (select |v_old(#memory_int)_BEFORE_CALL_11| 1))) (= 12 (select |v_old(#length)_BEFORE_CALL_11| 3)) (not (= |v_main_~#a~0.base_BEFORE_CALL_11| 3)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_11| 1) 0)) (not (= |v_main_~#a~0.base_BEFORE_CALL_11| 1)) (= (select |v_old(#valid)_BEFORE_CALL_11| 1) 1) (= (select |v_old(#valid)_BEFORE_CALL_11| 3) 1) (= (select |v_old(#length)_BEFORE_CALL_11| 1) 2) (not (= |v_old(#valid)_BEFORE_CALL_11| |v_old(#length)_BEFORE_CALL_11|)) (= (select |v_old(#valid)_BEFORE_CALL_11| 0) 0))) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:14,867 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:14,867 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:14,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2023-04-01 08:57:14,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958210973] [2023-04-01 08:57:14,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:14,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-04-01 08:57:14,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:14,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-04-01 08:57:14,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 08:57:14,869 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:15,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:15,078 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2023-04-01 08:57:15,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 08:57:15,079 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 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 37 [2023-04-01 08:57:15,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:15,079 INFO L225 Difference]: With dead ends: 68 [2023-04-01 08:57:15,079 INFO L226 Difference]: Without dead ends: 41 [2023-04-01 08:57:15,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 86 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=250, Invalid=1472, Unknown=0, NotChecked=0, Total=1722 [2023-04-01 08:57:15,081 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 75 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:15,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 65 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:15,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-04-01 08:57:15,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-04-01 08:57:15,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:15,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2023-04-01 08:57:15,088 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 37 [2023-04-01 08:57:15,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:15,089 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2023-04-01 08:57:15,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:15,089 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2023-04-01 08:57:15,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 08:57:15,089 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:15,089 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:15,097 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:15,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-01 08:57:15,295 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:15,296 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:15,296 INFO L85 PathProgramCache]: Analyzing trace with hash 868711363, now seen corresponding path program 12 times [2023-04-01 08:57:15,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:15,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813948453] [2023-04-01 08:57:15,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:15,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:15,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:17,655 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:17,655 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:17,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1813948453] [2023-04-01 08:57:17,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1813948453] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:17,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512597063] [2023-04-01 08:57:17,655 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:57:17,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:17,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:17,656 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:17,658 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-01 08:57:17,727 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:57:17,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:17,730 INFO L262 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 102 conjunts are in the unsatisfiable core [2023-04-01 08:57:17,732 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:17,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 08:57:18,793 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:18,794 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:20,352 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 08:57:20,353 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512597063] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:20,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [340285365] [2023-04-01 08:57:20,353 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:57:20,353 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:20,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:20,354 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:20,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:20,385 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:20,805 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:20,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:20,831 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:22,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4849#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_12| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_12| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_12| Int) (|v_old(#length)_BEFORE_CALL_12| (Array Int Int))) (and (= 14 (select |v_old(#length)_BEFORE_CALL_12| 2)) (= (select |v_old(#length)_BEFORE_CALL_12| 3) 12) (not (= |v_main_~#a~0.base_BEFORE_CALL_12| 2)) (= (select |v_old(#valid)_BEFORE_CALL_12| 3) 1) (not (= |v_main_~#a~0.base_BEFORE_CALL_12| |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_12| (select |v_old(#memory_int)_BEFORE_CALL_12| 1))) (= (select |v_old(#valid)_BEFORE_CALL_12| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_12| 1) 2) (= (select |v_old(#valid)_BEFORE_CALL_12| |v_main_~#a~0.base_BEFORE_CALL_12|) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_12| 3)) (not (= |v_old(#valid)_BEFORE_CALL_12| |v_old(#length)_BEFORE_CALL_12|)) (not (= |v_main_~#a~0.base_BEFORE_CALL_12| 0)) (= 0 (select (select |v_old(#memory_int)_BEFORE_CALL_12| 1) 1)) (not (= |v_old(#length)_BEFORE_CALL_12| (select |v_old(#memory_int)_BEFORE_CALL_12| 1))) (= (select |v_old(#valid)_BEFORE_CALL_12| 1) 1) (= (select (select |v_old(#memory_int)_BEFORE_CALL_12| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_12| 0) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_12| 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 08:57:22,121 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:22,121 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:22,121 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 32, 27] total 78 [2023-04-01 08:57:22,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823334173] [2023-04-01 08:57:22,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:22,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2023-04-01 08:57:22,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:22,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2023-04-01 08:57:22,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=7531, Unknown=0, NotChecked=0, Total=7832 [2023-04-01 08:57:22,124 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 78 states, 78 states have (on average 1.141025641025641) internal successors, (89), 76 states have internal predecessors, (89), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:24,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:24,206 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2023-04-01 08:57:24,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-04-01 08:57:24,206 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.141025641025641) internal successors, (89), 76 states have internal predecessors, (89), 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 40 [2023-04-01 08:57:24,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:24,207 INFO L225 Difference]: With dead ends: 65 [2023-04-01 08:57:24,207 INFO L226 Difference]: Without dead ends: 60 [2023-04-01 08:57:24,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 61 SyntacticMatches, 5 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3113 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=484, Invalid=10858, Unknown=0, NotChecked=0, Total=11342 [2023-04-01 08:57:24,209 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 5 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 1927 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 1952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 1927 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:24,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 304 Invalid, 1952 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 1927 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-04-01 08:57:24,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-01 08:57:24,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 55. [2023-04-01 08:57:24,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.16) internal successors, (58), 50 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:24,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2023-04-01 08:57:24,219 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 40 [2023-04-01 08:57:24,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:24,219 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2023-04-01 08:57:24,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 1.141025641025641) internal successors, (89), 76 states have internal predecessors, (89), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:24,220 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2023-04-01 08:57:24,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-01 08:57:24,220 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:24,220 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:24,225 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:24,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-01 08:57:24,423 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:24,423 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:24,423 INFO L85 PathProgramCache]: Analyzing trace with hash -1763530013, now seen corresponding path program 13 times [2023-04-01 08:57:24,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:24,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818921832] [2023-04-01 08:57:24,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:24,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:24,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:24,596 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-01 08:57:24,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:24,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818921832] [2023-04-01 08:57:24,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818921832] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:24,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345157177] [2023-04-01 08:57:24,596 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 08:57:24,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:24,597 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:24,598 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:24,601 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-01 08:57:24,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:24,678 INFO L262 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-01 08:57:24,680 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:24,799 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-01 08:57:24,799 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:24,890 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-01 08:57:24,890 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345157177] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:24,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1431774613] [2023-04-01 08:57:24,891 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:57:24,892 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:24,892 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:24,892 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:24,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:24,921 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:25,321 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:25,340 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:25,343 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:25,938 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5389#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_old(#length)_BEFORE_CALL_13| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_13| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_13| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_13| Int)) (and (= (select |v_old(#valid)_BEFORE_CALL_13| 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_13| 3) 1) (not (= |v_main_~#a~0.base_BEFORE_CALL_13| 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_13| 1) |v_old(#length)_BEFORE_CALL_13|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_13| 1) 0)) (not (= |v_main_~#a~0.base_BEFORE_CALL_13| 3)) (not (= |v_main_~#a~0.base_BEFORE_CALL_13| 2)) (not (= |v_old(#valid)_BEFORE_CALL_13| (select |v_old(#memory_int)_BEFORE_CALL_13| 1))) (not (= |v_main_~#a~0.base_BEFORE_CALL_13| |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_13| 1) 1) (= 2 (select |v_old(#length)_BEFORE_CALL_13| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_13| 1) 1) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_13| 1)) (= 14 (select |v_old(#length)_BEFORE_CALL_13| 2)) (= (select |v_old(#valid)_BEFORE_CALL_13| |v_main_~#a~0.base_BEFORE_CALL_13|) 0) (= (select |v_old(#valid)_BEFORE_CALL_13| 2) 1) (not (= |v_old(#valid)_BEFORE_CALL_13| |v_old(#length)_BEFORE_CALL_13|)) (= 12 (select |v_old(#length)_BEFORE_CALL_13| 3)))) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:25,939 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:25,939 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:25,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-04-01 08:57:25,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070192112] [2023-04-01 08:57:25,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:25,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-01 08:57:25,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:25,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-01 08:57:25,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=959, Unknown=0, NotChecked=0, Total=1122 [2023-04-01 08:57:25,941 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 23 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:26,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:26,162 INFO L93 Difference]: Finished difference Result 104 states and 118 transitions. [2023-04-01 08:57:26,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-01 08:57:26,163 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 23 states have internal predecessors, (36), 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 41 [2023-04-01 08:57:26,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:26,163 INFO L225 Difference]: With dead ends: 104 [2023-04-01 08:57:26,163 INFO L226 Difference]: Without dead ends: 56 [2023-04-01 08:57:26,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 94 SyntacticMatches, 11 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=240, Invalid=1320, Unknown=0, NotChecked=0, Total=1560 [2023-04-01 08:57:26,164 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:26,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 57 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:26,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-04-01 08:57:26,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-04-01 08:57:26,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 51 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:26,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2023-04-01 08:57:26,176 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 41 [2023-04-01 08:57:26,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:26,176 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2023-04-01 08:57:26,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 23 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:26,177 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2023-04-01 08:57:26,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-01 08:57:26,177 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:26,177 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:26,185 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:26,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-01 08:57:26,383 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:26,383 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:26,383 INFO L85 PathProgramCache]: Analyzing trace with hash -959941203, now seen corresponding path program 14 times [2023-04-01 08:57:26,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:26,383 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084620781] [2023-04-01 08:57:26,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:26,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:26,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:26,560 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-04-01 08:57:26,560 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:26,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084620781] [2023-04-01 08:57:26,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084620781] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:26,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539566105] [2023-04-01 08:57:26,560 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 08:57:26,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:26,561 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:26,562 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:26,565 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-01 08:57:26,706 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 08:57:26,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:26,708 INFO L262 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-01 08:57:26,710 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 08:57:26,898 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-04-01 08:57:26,898 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 08:57:27,024 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-04-01 08:57:27,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539566105] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 08:57:27,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1807238476] [2023-04-01 08:57:27,025 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 08:57:27,025 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 08:57:27,025 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 08:57:27,025 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 08:57:27,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 08:57:27,048 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 53 for LOIs [2023-04-01 08:57:27,465 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 65 for LOIs [2023-04-01 08:57:27,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 08:57:27,493 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 08:57:28,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5996#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (not (= ~SIZE~0 1)) (= |#NULL.offset| 0) (exists ((|v_old(#length)_BEFORE_CALL_14| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_14| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_14| (Array Int Int)) (|v_main_~#a~0.base_BEFORE_CALL_14| Int)) (and (not (= (select |v_old(#memory_int)_BEFORE_CALL_14| 1) |v_old(#length)_BEFORE_CALL_14|)) (= (select |v_old(#valid)_BEFORE_CALL_14| 2) 1) (= (select |v_old(#length)_BEFORE_CALL_14| 1) 2) (not (= |v_main_~#a~0.base_BEFORE_CALL_14| 2)) (= (select |v_old(#valid)_BEFORE_CALL_14| 3) 1) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_14| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_14| |v_main_~#a~0.base_BEFORE_CALL_14|) 0) (not (= |v_main_~#a~0.base_BEFORE_CALL_14| 3)) (not (= |v_main_~#a~0.base_BEFORE_CALL_14| 0)) (= (select |v_old(#valid)_BEFORE_CALL_14| 0) 0) (= (select |v_old(#length)_BEFORE_CALL_14| 2) 14) (not (= |v_main_~#a~0.base_BEFORE_CALL_14| 1)) (not (= |v_old(#valid)_BEFORE_CALL_14| |v_old(#length)_BEFORE_CALL_14|)) (not (= |v_main_~#a~0.base_BEFORE_CALL_14| |#StackHeapBarrier|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_14| 1) 1) 0) (= 12 (select |v_old(#length)_BEFORE_CALL_14| 3)) (= (select |v_old(#valid)_BEFORE_CALL_14| 1) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_14| 1) |v_old(#valid)_BEFORE_CALL_14|)))) (= |#NULL.base| 0))' at error location [2023-04-01 08:57:28,155 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 08:57:28,155 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 08:57:28,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2023-04-01 08:57:28,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808303705] [2023-04-01 08:57:28,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 08:57:28,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-04-01 08:57:28,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 08:57:28,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-04-01 08:57:28,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1303, Unknown=0, NotChecked=0, Total=1482 [2023-04-01 08:57:28,156 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 28 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:28,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 08:57:28,422 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2023-04-01 08:57:28,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-01 08:57:28,423 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 28 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2023-04-01 08:57:28,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 08:57:28,423 INFO L225 Difference]: With dead ends: 77 [2023-04-01 08:57:28,423 INFO L226 Difference]: Without dead ends: 46 [2023-04-01 08:57:28,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 98 SyntacticMatches, 12 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 928 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=321, Invalid=1841, Unknown=0, NotChecked=0, Total=2162 [2023-04-01 08:57:28,425 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 08:57:28,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 121 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 08:57:28,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-01 08:57:28,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-04-01 08:57:28,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:28,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2023-04-01 08:57:28,434 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 42 [2023-04-01 08:57:28,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 08:57:28,434 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2023-04-01 08:57:28,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 28 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 08:57:28,434 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2023-04-01 08:57:28,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 08:57:28,435 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 08:57:28,435 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 08:57:28,440 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-01 08:57:28,641 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:28,641 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 08:57:28,641 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 08:57:28,641 INFO L85 PathProgramCache]: Analyzing trace with hash 368751424, now seen corresponding path program 15 times [2023-04-01 08:57:28,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 08:57:28,642 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519703699] [2023-04-01 08:57:28,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 08:57:28,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 08:57:28,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 08:57:31,595 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 10 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 08:57:31,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 08:57:31,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519703699] [2023-04-01 08:57:31,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519703699] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 08:57:31,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571629843] [2023-04-01 08:57:31,596 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 08:57:31,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 08:57:31,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 08:57:31,597 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 08:57:31,600 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-01 08:57:31,676 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 08:57:31,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 08:57:31,678 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 122 conjunts are in the unsatisfiable core [2023-04-01 08:57:31,680 INFO L285 TraceCheckSpWp]: Computing forward predicates...