/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/loop-lit/mcmillan2006.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:06:49,602 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:06:49,604 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:06:49,642 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:06:49,642 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:06:49,645 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:06:49,648 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:06:49,650 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:06:49,651 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:06:49,655 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:06:49,655 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:06:49,656 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:06:49,656 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:06:49,657 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:06:49,657 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:06:49,658 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:06:49,658 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:06:49,659 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:06:49,660 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:06:49,661 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:06:49,661 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:06:49,665 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:06:49,666 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:06:49,667 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:06:49,674 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 11:06:49,674 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 11:06:49,674 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 11:06:49,675 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 11:06:49,675 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 11:06:49,676 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 11:06:49,676 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:06:49,677 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:06:49,678 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:06:49,678 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:06:49,678 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:06:49,678 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:06:49,679 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:06:49,679 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:06:49,679 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:06:49,679 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:06:49,680 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:06:49,681 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 11:06:49,704 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:06:49,705 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:06:49,705 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:06:49,705 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:06:49,706 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:06:49,706 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:06:49,706 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:06:49,706 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:06:49,706 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:06:49,706 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:06:49,707 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:06:49,707 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:06:49,707 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:06:49,707 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:06:49,707 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:06:49,707 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:06:49,707 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:06:49,707 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:06:49,708 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:06:49,708 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:06:49,708 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:06:49,708 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:06:49,708 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:06:49,708 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:06:49,708 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:06:49,708 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:06:49,708 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:06:49,709 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:06:49,709 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:06:49,709 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:06:49,709 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:06:49,709 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:06:49,709 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:06:49,709 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:06:49,709 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:06:49,709 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:06:49,710 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:06:49,710 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:06:49,710 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:06:49,710 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:06:49,710 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:06:49,710 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:06:49,891 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:06:49,913 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:06:49,915 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:06:49,916 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:06:49,916 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:06:49,917 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-lit/mcmillan2006.i [2023-04-01 11:06:50,892 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:06:51,097 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:06:51,098 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-lit/mcmillan2006.i [2023-04-01 11:06:51,108 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6947f59ac/91d76058d3db4d358376ad2610bedb8e/FLAGf788aa127 [2023-04-01 11:06:51,119 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6947f59ac/91d76058d3db4d358376ad2610bedb8e [2023-04-01 11:06:51,121 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:06:51,122 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:06:51,122 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:06:51,122 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:06:51,125 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:06:51,125 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,126 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24ab8f83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51, skipping insertion in model container [2023-04-01 11:06:51,126 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,130 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:06:51,138 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:06:51,228 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/loop-lit/mcmillan2006.i[1009,1022] [2023-04-01 11:06:51,240 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:06:51,246 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:06:51,254 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/loop-lit/mcmillan2006.i[1009,1022] [2023-04-01 11:06:51,257 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:06:51,266 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:06:51,266 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51 WrapperNode [2023-04-01 11:06:51,266 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:06:51,267 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:06:51,267 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:06:51,267 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:06:51,274 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,274 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,278 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,278 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,282 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,284 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,285 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,286 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,287 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:06:51,287 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:06:51,287 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:06:51,287 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:06:51,288 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (1/1) ... [2023-04-01 11:06:51,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:06:51,299 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:51,308 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 11:06:51,343 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 11:06:51,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:06:51,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:06:51,365 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:06:51,366 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 11:06:51,366 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 11:06:51,367 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 11:06:51,367 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 11:06:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:06:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 11:06:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:06:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:06:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:06:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:06:51,368 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:06:51,369 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:06:51,422 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:06:51,424 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:06:51,598 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:06:51,617 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:06:51,617 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 11:06:51,619 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:06:51 BoogieIcfgContainer [2023-04-01 11:06:51,619 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:06:51,621 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:06:51,621 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:06:51,623 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:06:51,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:06:51" (1/3) ... [2023-04-01 11:06:51,623 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f3c75d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:06:51, skipping insertion in model container [2023-04-01 11:06:51,624 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:51" (2/3) ... [2023-04-01 11:06:51,624 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f3c75d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:06:51, skipping insertion in model container [2023-04-01 11:06:51,624 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:06:51" (3/3) ... [2023-04-01 11:06:51,625 INFO L112 eAbstractionObserver]: Analyzing ICFG mcmillan2006.i [2023-04-01 11:06:51,655 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:06:51,655 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:06:51,685 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:06:51,690 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;@750fe7d3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:06:51,690 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:06:51,693 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 11:06:51,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-01 11:06:51,697 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:51,698 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:51,698 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:51,702 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:51,702 INFO L85 PathProgramCache]: Analyzing trace with hash 344125503, now seen corresponding path program 1 times [2023-04-01 11:06:51,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:51,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974072588] [2023-04-01 11:06:51,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:51,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:51,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:51,954 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 11:06:51,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:51,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974072588] [2023-04-01 11:06:51,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974072588] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:06:51,955 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:06:51,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 11:06:51,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276840215] [2023-04-01 11:06:51,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:06:51,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 11:06:51,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:06:51,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 11:06:51,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:06:51,980 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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 11:06:52,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:06:52,037 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2023-04-01 11:06:52,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 11:06:52,039 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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 12 [2023-04-01 11:06:52,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:06:52,045 INFO L225 Difference]: With dead ends: 37 [2023-04-01 11:06:52,046 INFO L226 Difference]: Without dead ends: 17 [2023-04-01 11:06:52,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-04-01 11:06:52,050 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 5 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:06:52,051 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 50 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:06:52,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-04-01 11:06:52,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-04-01 11:06:52,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 11:06:52,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-04-01 11:06:52,073 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2023-04-01 11:06:52,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:06:52,073 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-04-01 11:06:52,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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 11:06:52,073 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-04-01 11:06:52,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-01 11:06:52,074 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:52,074 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:52,074 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 11:06:52,074 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:52,075 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:52,075 INFO L85 PathProgramCache]: Analyzing trace with hash -465096016, now seen corresponding path program 1 times [2023-04-01 11:06:52,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:52,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245758509] [2023-04-01 11:06:52,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:52,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:52,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:52,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:52,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:52,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245758509] [2023-04-01 11:06:52,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245758509] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:52,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538600922] [2023-04-01 11:06:52,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:52,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:52,378 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:52,385 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 11:06:52,414 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 11:06:52,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:52,452 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-01 11:06:52,458 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:06:52,551 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 11:06:52,613 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:52,613 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:06:52,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2023-04-01 11:06:52,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2023-04-01 11:06:52,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:52,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538600922] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:06:52,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1194280643] [2023-04-01 11:06:52,749 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 11:06:52,750 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:06:52,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:06:52,759 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:06:52,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:06:52,870 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:06:53,090 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 61 for LOIs [2023-04-01 11:06:53,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:06:53,152 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:06:53,848 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '193#(and (exists ((|v_old(#length)_BEFORE_CALL_1| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_1| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_1| (Array Int Int)) (v_main_~x~0.base_BEFORE_CALL_1 Int)) (and (not (= |v_old(#valid)_BEFORE_CALL_1| |v_old(#length)_BEFORE_CALL_1|)) (not (= v_main_~x~0.base_BEFORE_CALL_1 1)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#valid)_BEFORE_CALL_1|)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_1| 1) 1) (not (= v_main_~x~0.base_BEFORE_CALL_1 |#StackHeapBarrier|)) (not (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_1) 0) 0)) (= 2 (select |v_old(#length)_BEFORE_CALL_1| 1)) (= (select |v_old(#valid)_BEFORE_CALL_1| v_main_~x~0.base_BEFORE_CALL_1) 0) (= (select |v_old(#valid)_BEFORE_CALL_1| 2) 1) (not (= v_main_~x~0.base_BEFORE_CALL_1 2)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_1| 1) |v_old(#length)_BEFORE_CALL_1|)) (= (select |v_old(#length)_BEFORE_CALL_1| 2) 9) (= (select |v_old(#valid)_BEFORE_CALL_1| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_1| 1) 1) 0) (not (= v_main_~x~0.base_BEFORE_CALL_1 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:06:53,848 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:06:53,849 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:06:53,849 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-04-01 11:06:53,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453386546] [2023-04-01 11:06:53,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:06:53,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-01 11:06:53,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:06:53,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-01 11:06:53,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=490, Unknown=0, NotChecked=0, Total=552 [2023-04-01 11:06:53,851 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 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 11:06:53,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:06:53,941 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2023-04-01 11:06:53,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 11:06:53,941 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 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 13 [2023-04-01 11:06:53,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:06:53,942 INFO L225 Difference]: With dead ends: 26 [2023-04-01 11:06:53,942 INFO L226 Difference]: Without dead ends: 24 [2023-04-01 11:06:53,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=575, Unknown=0, NotChecked=0, Total=650 [2023-04-01 11:06:53,943 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 21 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:06:53,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 62 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:06:53,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-01 11:06:53,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2023-04-01 11:06:53,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:06:53,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-04-01 11:06:53,947 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 13 [2023-04-01 11:06:53,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:06:53,947 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-04-01 11:06:53,948 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 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 11:06:53,948 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-04-01 11:06:53,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-01 11:06:53,948 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:53,948 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:53,965 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 11:06:54,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:54,149 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:54,149 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:54,149 INFO L85 PathProgramCache]: Analyzing trace with hash -302587894, now seen corresponding path program 1 times [2023-04-01 11:06:54,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:54,150 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160145131] [2023-04-01 11:06:54,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:54,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:54,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:54,289 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:54,291 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:54,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160145131] [2023-04-01 11:06:54,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160145131] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:54,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857221362] [2023-04-01 11:06:54,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:54,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:54,292 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:54,305 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 11:06:54,306 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 11:06:54,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:54,362 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-01 11:06:54,364 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:06:54,416 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:54,416 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:06:54,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:54,443 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857221362] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:06:54,443 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [857484339] [2023-04-01 11:06:54,445 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:06:54,445 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:06:54,445 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:06:54,445 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:06:54,445 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:06:54,471 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:06:55,001 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:06:55,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:06:55,099 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:06:55,903 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '408#(and (exists ((|v_old(#memory_int)_BEFORE_CALL_10| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_10| (Array Int Int)) (v_main_~x~0.base_BEFORE_CALL_10 Int) (v_main_~i~1_BEFORE_CALL_12 Int) (v_main_~x~0.offset_BEFORE_CALL_10 Int) (|v_old(#length)_BEFORE_CALL_10| (Array Int Int))) (and (not (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_10) (+ v_main_~x~0.offset_BEFORE_CALL_10 (* v_main_~i~1_BEFORE_CALL_12 4))) 0)) (or (and (not (= |v_old(#valid)_BEFORE_CALL_10| |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#length)_BEFORE_CALL_10| 2) 9) (not (= v_main_~x~0.base_BEFORE_CALL_10 0)) (not (= v_main_~x~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)) (not (= v_main_~x~0.base_BEFORE_CALL_10 2)) (= 2 (select |v_old(#length)_BEFORE_CALL_10| 1)) (= (select |v_old(#valid)_BEFORE_CALL_10| v_main_~x~0.base_BEFORE_CALL_10) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 1) 0) (not (= |#StackHeapBarrier| 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|)) (= v_main_~x~0.offset_BEFORE_CALL_10 0) (= |#NULL.offset| 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 2) 1) (= v_main_~i~1_BEFORE_CALL_12 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_10 |#StackHeapBarrier|)) (= |#NULL.base| 0)) (and (not (= |v_old(#valid)_BEFORE_CALL_10| |v_old(#length)_BEFORE_CALL_10|)) (= (select |v_old(#length)_BEFORE_CALL_10| 2) 9) (not (= v_main_~x~0.base_BEFORE_CALL_10 0)) (not (= v_main_~x~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)) (not (= v_main_~x~0.base_BEFORE_CALL_10 2)) (= 2 (select |v_old(#length)_BEFORE_CALL_10| 1)) (= (select |v_old(#valid)_BEFORE_CALL_10| v_main_~x~0.base_BEFORE_CALL_10) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_10| 1) 1) 0) (not (= |#StackHeapBarrier| 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|)) (= v_main_~x~0.offset_BEFORE_CALL_10 0) (= |#NULL.offset| 0) (= (select |v_old(#valid)_BEFORE_CALL_10| 2) 1) (= (select |v_old(#valid)_BEFORE_CALL_10| 0) 0) (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_10) 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_10 |#StackHeapBarrier|)) (not (= (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_10) (select |v_old(#memory_int)_BEFORE_CALL_10| 1))) (= |#NULL.base| 0))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 11:06:55,904 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:06:55,904 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:06:55,904 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2023-04-01 11:06:55,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401998234] [2023-04-01 11:06:55,904 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:06:55,904 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-01 11:06:55,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:06:55,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-01 11:06:55,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=440, Unknown=2, NotChecked=0, Total=506 [2023-04-01 11:06:55,905 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 11:06:55,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:06:55,948 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2023-04-01 11:06:55,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 11:06:55,948 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 20 [2023-04-01 11:06:55,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:06:55,950 INFO L225 Difference]: With dead ends: 37 [2023-04-01 11:06:55,950 INFO L226 Difference]: Without dead ends: 24 [2023-04-01 11:06:55,950 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=521, Unknown=2, NotChecked=0, Total=600 [2023-04-01 11:06:55,951 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:06:55,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 44 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:06:55,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-01 11:06:55,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-04-01 11:06:55,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:06:55,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-04-01 11:06:55,955 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2023-04-01 11:06:55,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:06:55,955 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-04-01 11:06:55,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 5 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 11:06:55,956 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-04-01 11:06:55,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 11:06:55,956 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:55,956 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:55,975 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 11:06:56,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 11:06:56,161 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:56,161 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:56,162 INFO L85 PathProgramCache]: Analyzing trace with hash -795991685, now seen corresponding path program 2 times [2023-04-01 11:06:56,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:56,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490086571] [2023-04-01 11:06:56,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:56,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:56,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:56,382 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:56,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:56,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490086571] [2023-04-01 11:06:56,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490086571] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:56,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463841705] [2023-04-01 11:06:56,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:06:56,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:56,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:56,384 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 11:06:56,431 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 11:06:56,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 11:06:56,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:06:56,444 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 35 conjunts are in the unsatisfiable core [2023-04-01 11:06:56,445 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:06:56,461 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 11:06:56,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-04-01 11:06:56,705 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 11:06:56,706 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 11:06:56,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 13 [2023-04-01 11:06:56,727 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:56,728 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:06:56,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463841705] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:56,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1905771203] [2023-04-01 11:06:56,814 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:06:56,814 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:06:56,814 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:06:56,814 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:06:56,814 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:06:56,833 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:06:57,238 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:06:57,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:06:57,319 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:06:58,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '623#(and (exists ((v_main_~x~0.base_BEFORE_CALL_20 Int) (|v_old(#length)_BEFORE_CALL_19| (Array Int Int)) (v_main_~x~0.offset_BEFORE_CALL_20 Int) (|v_old(#memory_int)_BEFORE_CALL_19| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_19| (Array Int Int)) (v_main_~i~1_BEFORE_CALL_22 Int)) (and (or (and (= 9 (select |v_old(#length)_BEFORE_CALL_19| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_19| v_main_~x~0.base_BEFORE_CALL_20) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#valid)_BEFORE_CALL_19|)) (= v_main_~x~0.offset_BEFORE_CALL_20 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#length)_BEFORE_CALL_19|)) (= (select |v_old(#valid)_BEFORE_CALL_19| 0) 0) (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_20) 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_20 0)) (not (= v_main_~x~0.base_BEFORE_CALL_20 |#StackHeapBarrier|)) (= (select |v_old(#length)_BEFORE_CALL_19| 1) 2) (not (= |#StackHeapBarrier| 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_20))) (= (select |v_old(#valid)_BEFORE_CALL_19| 2) 1) (= |#NULL.offset| 0) (= 1 (select |v_old(#valid)_BEFORE_CALL_19| 1)) (not (= |v_old(#valid)_BEFORE_CALL_19| |v_old(#length)_BEFORE_CALL_19|)) (not (= v_main_~x~0.base_BEFORE_CALL_20 1)) (not (= v_main_~x~0.base_BEFORE_CALL_20 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 1) 0) (= |#NULL.base| 0)) (and (= 9 (select |v_old(#length)_BEFORE_CALL_19| 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_19| v_main_~x~0.base_BEFORE_CALL_20) 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#valid)_BEFORE_CALL_19|)) (= v_main_~x~0.offset_BEFORE_CALL_20 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_19| 1) |v_old(#length)_BEFORE_CALL_19|)) (= (select |v_old(#valid)_BEFORE_CALL_19| 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_20 0)) (not (= v_main_~x~0.base_BEFORE_CALL_20 |#StackHeapBarrier|)) (= (select |v_old(#length)_BEFORE_CALL_19| 1) 2) (not (= |#StackHeapBarrier| 0)) (= v_main_~i~1_BEFORE_CALL_22 0) (= (select |v_old(#valid)_BEFORE_CALL_19| 2) 1) (= |#NULL.offset| 0) (= 1 (select |v_old(#valid)_BEFORE_CALL_19| 1)) (not (= |v_old(#valid)_BEFORE_CALL_19| |v_old(#length)_BEFORE_CALL_19|)) (not (= v_main_~x~0.base_BEFORE_CALL_20 1)) (not (= v_main_~x~0.base_BEFORE_CALL_20 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_19| 1) 1) 0) (= |#NULL.base| 0))) (not (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_20) (+ (* v_main_~i~1_BEFORE_CALL_22 4) v_main_~x~0.offset_BEFORE_CALL_20)) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 11:06:58,125 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:06:58,125 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 11:06:58,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 21 [2023-04-01 11:06:58,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73463575] [2023-04-01 11:06:58,125 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 11:06:58,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-01 11:06:58,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:06:58,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-01 11:06:58,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1210, Unknown=2, NotChecked=0, Total=1332 [2023-04-01 11:06:58,127 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 21 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:06:58,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:06:58,462 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2023-04-01 11:06:58,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-01 11:06:58,462 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 21 [2023-04-01 11:06:58,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:06:58,464 INFO L225 Difference]: With dead ends: 46 [2023-04-01 11:06:58,464 INFO L226 Difference]: Without dead ends: 33 [2023-04-01 11:06:58,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 601 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=271, Invalid=2277, Unknown=2, NotChecked=0, Total=2550 [2023-04-01 11:06:58,468 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 38 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:06:58,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 94 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:06:58,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-01 11:06:58,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2023-04-01 11:06:58,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 23 states have internal predecessors, (24), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 11:06:58,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2023-04-01 11:06:58,501 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 21 [2023-04-01 11:06:58,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:06:58,501 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2023-04-01 11:06:58,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 18 states have internal predecessors, (27), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:06:58,501 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2023-04-01 11:06:58,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-01 11:06:58,502 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:58,502 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:58,532 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 11:06:58,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:58,703 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:58,703 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:58,703 INFO L85 PathProgramCache]: Analyzing trace with hash -1406007472, now seen corresponding path program 3 times [2023-04-01 11:06:58,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:58,704 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468216451] [2023-04-01 11:06:58,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:58,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:58,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:59,009 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 11:06:59,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:59,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468216451] [2023-04-01 11:06:59,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468216451] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:59,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114893801] [2023-04-01 11:06:59,010 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:06:59,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:59,010 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:59,011 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 11:06:59,034 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 11:06:59,090 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:06:59,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:06:59,090 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 21 conjunts are in the unsatisfiable core [2023-04-01 11:06:59,092 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:06:59,106 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 15 treesize of output 11 [2023-04-01 11:06:59,324 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-01 11:06:59,325 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 23 treesize of output 10 [2023-04-01 11:06:59,349 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 11:06:59,349 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:06:59,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [114893801] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:59,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1968568254] [2023-04-01 11:06:59,389 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:06:59,389 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:06:59,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:06:59,389 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:06:59,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:06:59,406 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:06:59,698 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:06:59,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:06:59,821 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:01,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '909#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((v_main_~x~0.base_BEFORE_CALL_31 Int) (|v_old(#memory_int)_BEFORE_CALL_28| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_28| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_28| (Array Int Int)) (v_main_~x~0.offset_BEFORE_CALL_31 Int) (v_main_~i~1_BEFORE_CALL_33 Int)) (and (or (and (not (= (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_31) (select |v_old(#memory_int)_BEFORE_CALL_28| 1))) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_28| 1) 0)) (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_31) 0) 0) (= (select |v_old(#length)_BEFORE_CALL_28| 2) 9) (not (= (select |v_old(#memory_int)_BEFORE_CALL_28| 1) |v_old(#valid)_BEFORE_CALL_28|)) (= (select |v_old(#valid)_BEFORE_CALL_28| 0) 0) (not (= |#StackHeapBarrier| 0)) (not (= v_main_~x~0.base_BEFORE_CALL_31 |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_28| v_main_~x~0.base_BEFORE_CALL_31) 0) (= (select |v_old(#valid)_BEFORE_CALL_28| 1) 1) (not (= v_main_~x~0.base_BEFORE_CALL_31 0)) (not (= v_main_~x~0.base_BEFORE_CALL_31 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_28| 1) 1) 0) (not (= |v_old(#valid)_BEFORE_CALL_28| |v_old(#length)_BEFORE_CALL_28|)) (= |#NULL.offset| 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_28| 1) |v_old(#length)_BEFORE_CALL_28|)) (= v_main_~x~0.offset_BEFORE_CALL_31 0) (= (select |v_old(#valid)_BEFORE_CALL_28| 2) 1) (not (= v_main_~x~0.base_BEFORE_CALL_31 2)) (= 2 (select |v_old(#length)_BEFORE_CALL_28| 1)) (= |#NULL.base| 0)) (and (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_28| 1) 0)) (= v_main_~i~1_BEFORE_CALL_33 0) (= (select |v_old(#length)_BEFORE_CALL_28| 2) 9) (not (= (select |v_old(#memory_int)_BEFORE_CALL_28| 1) |v_old(#valid)_BEFORE_CALL_28|)) (= (select |v_old(#valid)_BEFORE_CALL_28| 0) 0) (not (= |#StackHeapBarrier| 0)) (not (= v_main_~x~0.base_BEFORE_CALL_31 |#StackHeapBarrier|)) (= (select |v_old(#valid)_BEFORE_CALL_28| v_main_~x~0.base_BEFORE_CALL_31) 0) (= (select |v_old(#valid)_BEFORE_CALL_28| 1) 1) (not (= v_main_~x~0.base_BEFORE_CALL_31 0)) (not (= v_main_~x~0.base_BEFORE_CALL_31 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_28| 1) 1) 0) (not (= |v_old(#valid)_BEFORE_CALL_28| |v_old(#length)_BEFORE_CALL_28|)) (= |#NULL.offset| 0) (not (= (select |v_old(#memory_int)_BEFORE_CALL_28| 1) |v_old(#length)_BEFORE_CALL_28|)) (= v_main_~x~0.offset_BEFORE_CALL_31 0) (= (select |v_old(#valid)_BEFORE_CALL_28| 2) 1) (not (= v_main_~x~0.base_BEFORE_CALL_31 2)) (= 2 (select |v_old(#length)_BEFORE_CALL_28| 1)) (= |#NULL.base| 0))) (not (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_31) (+ (* v_main_~i~1_BEFORE_CALL_33 4) v_main_~x~0.offset_BEFORE_CALL_31)) 0)))))' at error location [2023-04-01 11:07:01,386 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:01,386 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 11:07:01,386 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 20 [2023-04-01 11:07:01,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656136826] [2023-04-01 11:07:01,386 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:01,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 11:07:01,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:01,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 11:07:01,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1007, Unknown=3, NotChecked=0, Total=1122 [2023-04-01 11:07:01,388 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 18 states have internal predecessors, (32), 6 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:07:04,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:04,677 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2023-04-01 11:07:04,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 11:07:04,677 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 18 states have internal predecessors, (32), 6 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 29 [2023-04-01 11:07:04,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:04,678 INFO L225 Difference]: With dead ends: 48 [2023-04-01 11:07:04,678 INFO L226 Difference]: Without dead ends: 33 [2023-04-01 11:07:04,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=196, Invalid=1692, Unknown=4, NotChecked=0, Total=1892 [2023-04-01 11:07:04,679 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:04,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 96 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:07:04,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-01 11:07:04,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-04-01 11:07:04,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 11:07:04,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2023-04-01 11:07:04,684 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 29 [2023-04-01 11:07:04,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:04,684 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2023-04-01 11:07:04,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 18 states have internal predecessors, (32), 6 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:07:04,684 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2023-04-01 11:07:04,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 11:07:04,684 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:04,685 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:04,703 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 11:07:04,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:04,890 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:04,890 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:04,890 INFO L85 PathProgramCache]: Analyzing trace with hash 1033819391, now seen corresponding path program 4 times [2023-04-01 11:07:04,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:04,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846462504] [2023-04-01 11:07:04,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:04,891 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:04,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:05,124 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 11:07:05,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:05,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846462504] [2023-04-01 11:07:05,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846462504] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:05,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260952624] [2023-04-01 11:07:05,125 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 11:07:05,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:05,125 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:05,126 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 11:07:05,128 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 11:07:05,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:05,166 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 29 conjunts are in the unsatisfiable core [2023-04-01 11:07:05,168 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:05,213 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 11:07:05,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 11:07:05,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2023-04-01 11:07:05,413 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 11:07:05,414 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:05,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 19 [2023-04-01 11:07:05,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2023-04-01 11:07:05,474 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 11:07:05,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260952624] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:07:05,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1766843406] [2023-04-01 11:07:05,475 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:07:05,475 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:05,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:05,475 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:05,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:05,491 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:07:05,788 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:07:05,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:05,878 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:06,812 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1268#(and (exists ((|v_old(#length)_BEFORE_CALL_37| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_37| (Array Int (Array Int Int))) (v_main_~x~0.base_BEFORE_CALL_44 Int) (|v_old(#valid)_BEFORE_CALL_37| (Array Int Int)) (v_main_~x~0.offset_BEFORE_CALL_44 Int) (v_main_~i~1_BEFORE_CALL_46 Int)) (and (not (= 0 (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_44) (+ (* v_main_~i~1_BEFORE_CALL_46 4) v_main_~x~0.offset_BEFORE_CALL_44)))) (or (and (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_44) 0) 0) (= (select |v_old(#valid)_BEFORE_CALL_37| 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_44 1)) (not (= v_main_~x~0.base_BEFORE_CALL_44 |#StackHeapBarrier|)) (not (= v_main_~x~0.base_BEFORE_CALL_44 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_37| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_37| 2) 9) (not (= |#StackHeapBarrier| 0)) (not (= v_main_~x~0.base_BEFORE_CALL_44 0)) (= v_main_~x~0.offset_BEFORE_CALL_44 0) (= 1 (select |v_old(#valid)_BEFORE_CALL_37| 1)) (not (= |v_old(#length)_BEFORE_CALL_37| (select |v_old(#memory_int)_BEFORE_CALL_37| 1))) (= (select |v_old(#valid)_BEFORE_CALL_37| v_main_~x~0.base_BEFORE_CALL_44) 0) (not (= (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_44) (select |v_old(#memory_int)_BEFORE_CALL_37| 1))) (= |#NULL.offset| 0) (= 2 (select |v_old(#length)_BEFORE_CALL_37| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_37| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_37| 2) 1) (not (= |v_old(#valid)_BEFORE_CALL_37| |v_old(#length)_BEFORE_CALL_37|)) (not (= |v_old(#valid)_BEFORE_CALL_37| (select |v_old(#memory_int)_BEFORE_CALL_37| 1))) (= |#NULL.base| 0)) (and (= (select |v_old(#valid)_BEFORE_CALL_37| 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_44 1)) (not (= v_main_~x~0.base_BEFORE_CALL_44 |#StackHeapBarrier|)) (not (= v_main_~x~0.base_BEFORE_CALL_44 2)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_37| 1) 1) 0) (= (select |v_old(#length)_BEFORE_CALL_37| 2) 9) (not (= |#StackHeapBarrier| 0)) (not (= v_main_~x~0.base_BEFORE_CALL_44 0)) (= v_main_~x~0.offset_BEFORE_CALL_44 0) (= 1 (select |v_old(#valid)_BEFORE_CALL_37| 1)) (not (= |v_old(#length)_BEFORE_CALL_37| (select |v_old(#memory_int)_BEFORE_CALL_37| 1))) (= (select |v_old(#valid)_BEFORE_CALL_37| v_main_~x~0.base_BEFORE_CALL_44) 0) (= v_main_~i~1_BEFORE_CALL_46 0) (= |#NULL.offset| 0) (= 2 (select |v_old(#length)_BEFORE_CALL_37| 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_37| 1) 0) 48) (= (select |v_old(#valid)_BEFORE_CALL_37| 2) 1) (not (= |v_old(#valid)_BEFORE_CALL_37| |v_old(#length)_BEFORE_CALL_37|)) (not (= |v_old(#valid)_BEFORE_CALL_37| (select |v_old(#memory_int)_BEFORE_CALL_37| 1))) (= |#NULL.base| 0))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-04-01 11:07:06,812 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:06,812 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:07:06,812 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 13] total 25 [2023-04-01 11:07:06,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22754484] [2023-04-01 11:07:06,812 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:06,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 11:07:06,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:06,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 11:07:06,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1288, Unknown=2, NotChecked=0, Total=1406 [2023-04-01 11:07:06,814 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 25 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 23 states have internal predecessors, (38), 7 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 11:07:07,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:07,016 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2023-04-01 11:07:07,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 11:07:07,017 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 23 states have internal predecessors, (38), 7 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 30 [2023-04-01 11:07:07,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:07,017 INFO L225 Difference]: With dead ends: 43 [2023-04-01 11:07:07,018 INFO L226 Difference]: Without dead ends: 41 [2023-04-01 11:07:07,018 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=173, Invalid=1805, Unknown=2, NotChecked=0, Total=1980 [2023-04-01 11:07:07,019 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 27 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:07,019 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 164 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:07:07,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-04-01 11:07:07,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2023-04-01 11:07:07,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:07:07,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2023-04-01 11:07:07,025 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 30 [2023-04-01 11:07:07,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:07,025 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2023-04-01 11:07:07,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.5833333333333333) internal successors, (38), 23 states have internal predecessors, (38), 7 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 11:07:07,025 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2023-04-01 11:07:07,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 11:07:07,026 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:07,026 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:07,032 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 11:07:07,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:07,230 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:07,231 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:07,231 INFO L85 PathProgramCache]: Analyzing trace with hash 1101125339, now seen corresponding path program 5 times [2023-04-01 11:07:07,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:07,231 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82212859] [2023-04-01 11:07:07,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:07,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:07,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:07,483 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 11:07:07,483 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:07,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82212859] [2023-04-01 11:07:07,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82212859] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:07,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062053592] [2023-04-01 11:07:07,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:07:07,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:07,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:07,484 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 11:07:07,486 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 11:07:07,533 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 11:07:07,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:07:07,534 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 23 conjunts are in the unsatisfiable core [2023-04-01 11:07:07,536 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:07,590 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 15 treesize of output 11 [2023-04-01 11:07:08,010 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-01 11:07:08,011 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 23 treesize of output 10 [2023-04-01 11:07:08,051 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 12 proven. 19 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 11:07:08,051 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:08,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062053592] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:08,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1170737769] [2023-04-01 11:07:08,122 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:07:08,122 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:08,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:08,122 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:08,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:08,141 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:07:08,466 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:07:08,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:08,553 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:12,364 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1577#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_old(#memory_int)_BEFORE_CALL_46| (Array Int (Array Int Int))) (|v_old(#length)_BEFORE_CALL_46| (Array Int Int)) (|v_old(#valid)_BEFORE_CALL_46| (Array Int Int)) (v_main_~i~1_BEFORE_CALL_58 Int) (v_main_~x~0.base_BEFORE_CALL_56 Int) (v_main_~x~0.offset_BEFORE_CALL_56 Int)) (and (not (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_56) (+ (* v_main_~i~1_BEFORE_CALL_58 4) v_main_~x~0.offset_BEFORE_CALL_56)) 0)) (or (and (not (= (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_56) (select |v_old(#memory_int)_BEFORE_CALL_46| 1))) (not (= v_main_~x~0.base_BEFORE_CALL_56 |#StackHeapBarrier|)) (= 9 (select |v_old(#length)_BEFORE_CALL_46| 2)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_46| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_46| v_main_~x~0.base_BEFORE_CALL_56) 0) (= (select |v_old(#valid)_BEFORE_CALL_46| 2) 1) (= 0 (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_56) 0)) (not (= v_main_~x~0.base_BEFORE_CALL_56 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_46| 1) 1) 0) (not (= |#StackHeapBarrier| 0)) (not (= |v_old(#valid)_BEFORE_CALL_46| (select |v_old(#memory_int)_BEFORE_CALL_46| 1))) (not (= |v_old(#valid)_BEFORE_CALL_46| |v_old(#length)_BEFORE_CALL_46|)) (= v_main_~x~0.offset_BEFORE_CALL_56 0) (= (select |v_old(#valid)_BEFORE_CALL_46| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_46| (select |v_old(#memory_int)_BEFORE_CALL_46| 1))) (= |#NULL.offset| 0) (= 2 (select |v_old(#length)_BEFORE_CALL_46| 1)) (not (= v_main_~x~0.base_BEFORE_CALL_56 2)) (not (= v_main_~x~0.base_BEFORE_CALL_56 0)) (= (select |v_old(#valid)_BEFORE_CALL_46| 1) 1) (= |#NULL.base| 0)) (and (not (= v_main_~x~0.base_BEFORE_CALL_56 |#StackHeapBarrier|)) (= 9 (select |v_old(#length)_BEFORE_CALL_46| 2)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_46| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_46| v_main_~x~0.base_BEFORE_CALL_56) 0) (= (select |v_old(#valid)_BEFORE_CALL_46| 2) 1) (= v_main_~i~1_BEFORE_CALL_58 0) (not (= v_main_~x~0.base_BEFORE_CALL_56 1)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_46| 1) 1) 0) (not (= |#StackHeapBarrier| 0)) (not (= |v_old(#valid)_BEFORE_CALL_46| (select |v_old(#memory_int)_BEFORE_CALL_46| 1))) (not (= |v_old(#valid)_BEFORE_CALL_46| |v_old(#length)_BEFORE_CALL_46|)) (= v_main_~x~0.offset_BEFORE_CALL_56 0) (= (select |v_old(#valid)_BEFORE_CALL_46| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_46| (select |v_old(#memory_int)_BEFORE_CALL_46| 1))) (= |#NULL.offset| 0) (= 2 (select |v_old(#length)_BEFORE_CALL_46| 1)) (not (= v_main_~x~0.base_BEFORE_CALL_56 2)) (not (= v_main_~x~0.base_BEFORE_CALL_56 0)) (= (select |v_old(#valid)_BEFORE_CALL_46| 1) 1) (= |#NULL.base| 0))))))' at error location [2023-04-01 11:07:12,364 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:12,364 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 11:07:12,364 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 26 [2023-04-01 11:07:12,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707361543] [2023-04-01 11:07:12,364 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:12,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-01 11:07:12,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:12,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-01 11:07:12,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1498, Unknown=2, NotChecked=0, Total=1640 [2023-04-01 11:07:12,366 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 26 states, 25 states have (on average 1.56) internal successors, (39), 24 states have internal predecessors, (39), 8 states have call successors, (10), 4 states have call predecessors, (10), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 11:07:16,862 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:07:18,996 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:07:21,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:21,328 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2023-04-01 11:07:21,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-01 11:07:21,345 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.56) internal successors, (39), 24 states have internal predecessors, (39), 8 states have call successors, (10), 4 states have call predecessors, (10), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 37 [2023-04-01 11:07:21,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:21,348 INFO L225 Difference]: With dead ends: 72 [2023-04-01 11:07:21,348 INFO L226 Difference]: Without dead ends: 49 [2023-04-01 11:07:21,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 50 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=300, Invalid=3236, Unknown=4, NotChecked=0, Total=3540 [2023-04-01 11:07:21,350 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 35 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 19 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:21,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 225 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 647 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2023-04-01 11:07:21,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-01 11:07:21,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2023-04-01 11:07:21,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 35 states have internal predecessors, (36), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 11:07:21,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2023-04-01 11:07:21,369 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 37 [2023-04-01 11:07:21,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:21,369 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2023-04-01 11:07:21,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.56) internal successors, (39), 24 states have internal predecessors, (39), 8 states have call successors, (10), 4 states have call predecessors, (10), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 11:07:21,369 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2023-04-01 11:07:21,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 11:07:21,371 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:21,371 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:21,382 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 11:07:21,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:21,576 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:21,576 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:21,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1432650736, now seen corresponding path program 6 times [2023-04-01 11:07:21,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:21,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273416442] [2023-04-01 11:07:21,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:21,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:21,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:21,847 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 11:07:21,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:21,848 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273416442] [2023-04-01 11:07:21,848 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273416442] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:21,848 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283818648] [2023-04-01 11:07:21,848 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:07:21,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:21,848 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:21,851 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 11:07:21,854 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 11:07:21,920 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:07:21,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:07:21,921 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-01 11:07:21,924 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:21,998 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 15 treesize of output 11 [2023-04-01 11:07:22,692 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-01 11:07:22,692 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 23 treesize of output 10 [2023-04-01 11:07:22,729 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-01 11:07:22,729 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:22,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283818648] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:22,803 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [573798276] [2023-04-01 11:07:22,804 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:07:22,804 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:22,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:22,805 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:22,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:22,820 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:07:23,181 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:07:23,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:23,283 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:29,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1996#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((v_main_~x~0.base_BEFORE_CALL_69 Int) (|v_old(#memory_int)_BEFORE_CALL_55| (Array Int (Array Int Int))) (v_main_~i~1_BEFORE_CALL_71 Int) (|v_old(#valid)_BEFORE_CALL_55| (Array Int Int)) (v_main_~x~0.offset_BEFORE_CALL_69 Int) (|v_old(#length)_BEFORE_CALL_55| (Array Int Int))) (and (not (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_69) (+ (* v_main_~i~1_BEFORE_CALL_71 4) v_main_~x~0.offset_BEFORE_CALL_69)) 0)) (or (and (= (select |v_old(#valid)_BEFORE_CALL_55| 2) 1) (not (= |v_old(#length)_BEFORE_CALL_55| (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_69) 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_69 1)) (not (= v_main_~x~0.base_BEFORE_CALL_69 |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_55| |v_old(#length)_BEFORE_CALL_55|)) (not (= v_main_~x~0.base_BEFORE_CALL_69 2)) (= 9 (select |v_old(#length)_BEFORE_CALL_55| 2)) (= (select |v_old(#valid)_BEFORE_CALL_55| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_55| 1) 0) 48) (not (= |#StackHeapBarrier| 0)) (not (= (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_69) (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (= (select |v_old(#valid)_BEFORE_CALL_55| v_main_~x~0.base_BEFORE_CALL_69) 0) (not (= v_main_~x~0.base_BEFORE_CALL_69 0)) (not (= |v_old(#valid)_BEFORE_CALL_55| (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (= 2 (select |v_old(#length)_BEFORE_CALL_55| 1)) (= |#NULL.offset| 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_55| 1) 1) 0) (= v_main_~x~0.offset_BEFORE_CALL_69 0) (= (select |v_old(#valid)_BEFORE_CALL_55| 1) 1) (= |#NULL.base| 0)) (and (= (select |v_old(#valid)_BEFORE_CALL_55| 2) 1) (not (= |v_old(#length)_BEFORE_CALL_55| (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (not (= v_main_~x~0.base_BEFORE_CALL_69 1)) (not (= v_main_~x~0.base_BEFORE_CALL_69 |#StackHeapBarrier|)) (not (= |v_old(#valid)_BEFORE_CALL_55| |v_old(#length)_BEFORE_CALL_55|)) (not (= v_main_~x~0.base_BEFORE_CALL_69 2)) (= 9 (select |v_old(#length)_BEFORE_CALL_55| 2)) (= (select |v_old(#valid)_BEFORE_CALL_55| 0) 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_55| 1) 0) 48) (not (= |#StackHeapBarrier| 0)) (= v_main_~i~1_BEFORE_CALL_71 0) (= (select |v_old(#valid)_BEFORE_CALL_55| v_main_~x~0.base_BEFORE_CALL_69) 0) (not (= v_main_~x~0.base_BEFORE_CALL_69 0)) (not (= |v_old(#valid)_BEFORE_CALL_55| (select |v_old(#memory_int)_BEFORE_CALL_55| 1))) (= 2 (select |v_old(#length)_BEFORE_CALL_55| 1)) (= |#NULL.offset| 0) (= (select (select |v_old(#memory_int)_BEFORE_CALL_55| 1) 1) 0) (= v_main_~x~0.offset_BEFORE_CALL_69 0) (= (select |v_old(#valid)_BEFORE_CALL_55| 1) 1) (= |#NULL.base| 0))))))' at error location [2023-04-01 11:07:29,216 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:29,216 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 11:07:29,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 19] total 32 [2023-04-01 11:07:29,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451467005] [2023-04-01 11:07:29,216 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:29,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-01 11:07:29,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:29,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-01 11:07:29,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1988, Unknown=7, NotChecked=0, Total=2162 [2023-04-01 11:07:29,217 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 32 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 30 states have internal predecessors, (48), 10 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 11:07:33,691 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:07:35,857 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:07:37,992 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:07:40,205 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:07:42,209 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:07:44,218 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 11:07:46,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:46,470 INFO L93 Difference]: Finished difference Result 91 states and 95 transitions. [2023-04-01 11:07:46,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-04-01 11:07:46,471 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 30 states have internal predecessors, (48), 10 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 45 [2023-04-01 11:07:46,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:46,471 INFO L225 Difference]: With dead ends: 91 [2023-04-01 11:07:46,471 INFO L226 Difference]: Without dead ends: 57 [2023-04-01 11:07:46,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 60 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1157 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=432, Invalid=5109, Unknown=9, NotChecked=0, Total=5550 [2023-04-01 11:07:46,473 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 46 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 812 mSolverCounterSat, 29 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 847 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 812 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.4s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:46,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 188 Invalid, 847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 812 Invalid, 6 Unknown, 0 Unchecked, 12.4s Time] [2023-04-01 11:07:46,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-04-01 11:07:46,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2023-04-01 11:07:46,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 40 states have (on average 1.05) internal successors, (42), 41 states have internal predecessors, (42), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 11:07:46,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2023-04-01 11:07:46,482 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 45 [2023-04-01 11:07:46,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:46,482 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2023-04-01 11:07:46,482 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.5483870967741935) internal successors, (48), 30 states have internal predecessors, (48), 10 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 11:07:46,482 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2023-04-01 11:07:46,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-01 11:07:46,483 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:46,483 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:46,490 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 11:07:46,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:46,688 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:46,688 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:46,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1018895301, now seen corresponding path program 7 times [2023-04-01 11:07:46,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:46,689 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861538226] [2023-04-01 11:07:46,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:46,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:46,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:46,969 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 61 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-01 11:07:46,969 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:46,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861538226] [2023-04-01 11:07:46,969 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1861538226] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:46,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517003890] [2023-04-01 11:07:46,969 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 11:07:46,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:46,969 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:46,981 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 11:07:47,044 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 11:07:47,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:47,071 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 38 conjunts are in the unsatisfiable core [2023-04-01 11:07:47,073 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:47,176 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 11:07:47,660 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 71 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-01 11:07:47,660 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:47,718 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-01 11:07:47,726 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-04-01 11:07:47,747 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 61 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-01 11:07:47,747 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517003890] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:07:47,747 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1889986119] [2023-04-01 11:07:47,748 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:07:47,748 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:47,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:47,748 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:47,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:47,763 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:07:48,086 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:07:48,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:48,160 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:49,234 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2635#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_old(#valid)_BEFORE_CALL_64| (Array Int Int)) (v_main_~i~1_BEFORE_CALL_90 Int) (v_main_~x~0.offset_BEFORE_CALL_88 Int) (v_main_~x~0.base_BEFORE_CALL_88 Int) (|v_old(#length)_BEFORE_CALL_64| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_64| (Array Int (Array Int Int)))) (and (not (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_88) (+ (* v_main_~i~1_BEFORE_CALL_90 4) v_main_~x~0.offset_BEFORE_CALL_88)) 0)) (or (and (= v_main_~x~0.offset_BEFORE_CALL_88 0) (not (= |v_old(#valid)_BEFORE_CALL_64| |v_old(#length)_BEFORE_CALL_64|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_64| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_64| 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_88 1)) (not (= v_main_~x~0.base_BEFORE_CALL_88 |#StackHeapBarrier|)) (not (= v_main_~x~0.base_BEFORE_CALL_88 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_64| 1) |v_old(#length)_BEFORE_CALL_64|)) (= 2 (select |v_old(#length)_BEFORE_CALL_64| 1)) (not (= |#StackHeapBarrier| 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_64| 1) |v_old(#valid)_BEFORE_CALL_64|)) (= 9 (select |v_old(#length)_BEFORE_CALL_64| 2)) (not (= v_main_~x~0.base_BEFORE_CALL_88 2)) (= (select |v_old(#valid)_BEFORE_CALL_64| v_main_~x~0.base_BEFORE_CALL_88) 0) (= (select |v_old(#valid)_BEFORE_CALL_64| 2) 1) (= |#NULL.offset| 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_64| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_64| 1) 1) (= v_main_~i~1_BEFORE_CALL_90 0) (= |#NULL.base| 0)) (and (= v_main_~x~0.offset_BEFORE_CALL_88 0) (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_88) 0) 0) (not (= |v_old(#valid)_BEFORE_CALL_64| |v_old(#length)_BEFORE_CALL_64|)) (= (select (select |v_old(#memory_int)_BEFORE_CALL_64| 1) 1) 0) (= (select |v_old(#valid)_BEFORE_CALL_64| 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_88 1)) (not (= v_main_~x~0.base_BEFORE_CALL_88 |#StackHeapBarrier|)) (not (= v_main_~x~0.base_BEFORE_CALL_88 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_64| 1) |v_old(#length)_BEFORE_CALL_64|)) (= 2 (select |v_old(#length)_BEFORE_CALL_64| 1)) (not (= |#StackHeapBarrier| 0)) (not (= (select |v_old(#memory_int)_BEFORE_CALL_64| 1) |v_old(#valid)_BEFORE_CALL_64|)) (= 9 (select |v_old(#length)_BEFORE_CALL_64| 2)) (not (= v_main_~x~0.base_BEFORE_CALL_88 2)) (= (select |v_old(#valid)_BEFORE_CALL_64| v_main_~x~0.base_BEFORE_CALL_88) 0) (= (select |v_old(#valid)_BEFORE_CALL_64| 2) 1) (not (= (select |v_old(#memory_int)_BEFORE_CALL_64| 1) (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_88))) (= |#NULL.offset| 0) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_64| 1) 0)) (= (select |v_old(#valid)_BEFORE_CALL_64| 1) 1) (= |#NULL.base| 0))))))' at error location [2023-04-01 11:07:49,235 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:49,235 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:07:49,235 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 18] total 35 [2023-04-01 11:07:49,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975437330] [2023-04-01 11:07:49,235 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:49,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-01 11:07:49,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:49,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-01 11:07:49,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2108, Unknown=1, NotChecked=0, Total=2256 [2023-04-01 11:07:49,236 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 35 states, 34 states have (on average 1.588235294117647) internal successors, (54), 33 states have internal predecessors, (54), 13 states have call successors, (15), 4 states have call predecessors, (15), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-01 11:07:49,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:49,569 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2023-04-01 11:07:49,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-01 11:07:49,570 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.588235294117647) internal successors, (54), 33 states have internal predecessors, (54), 13 states have call successors, (15), 4 states have call predecessors, (15), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 53 [2023-04-01 11:07:49,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:49,570 INFO L225 Difference]: With dead ends: 66 [2023-04-01 11:07:49,570 INFO L226 Difference]: Without dead ends: 64 [2023-04-01 11:07:49,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 119 SyntacticMatches, 11 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 627 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=173, Invalid=2478, Unknown=1, NotChecked=0, Total=2652 [2023-04-01 11:07:49,571 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 19 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 716 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:49,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 259 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 716 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 11:07:49,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-04-01 11:07:49,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2023-04-01 11:07:49,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 46 states have internal predecessors, (47), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-01 11:07:49,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2023-04-01 11:07:49,579 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 53 [2023-04-01 11:07:49,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:49,579 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2023-04-01 11:07:49,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.588235294117647) internal successors, (54), 33 states have internal predecessors, (54), 13 states have call successors, (15), 4 states have call predecessors, (15), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-01 11:07:49,580 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2023-04-01 11:07:49,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-04-01 11:07:49,580 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:49,580 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:49,594 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 11:07:49,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-01 11:07:49,784 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:49,785 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:49,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1079808993, now seen corresponding path program 8 times [2023-04-01 11:07:49,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:49,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547965601] [2023-04-01 11:07:49,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:49,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:49,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:49,942 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 53 proven. 37 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 11:07:49,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:49,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547965601] [2023-04-01 11:07:49,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547965601] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:49,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143926732] [2023-04-01 11:07:49,943 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:07:49,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:49,943 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:49,947 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 11:07:49,949 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 11:07:50,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-01 11:07:50,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:07:50,043 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-01 11:07:50,044 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:50,188 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 69 proven. 21 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 11:07:50,188 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:50,295 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 69 proven. 21 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 11:07:50,296 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143926732] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:07:50,296 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [473726024] [2023-04-01 11:07:50,297 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:07:50,297 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:50,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:50,297 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:50,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:50,313 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:07:50,610 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:07:50,684 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:50,686 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:51,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3231#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((v_main_~x~0.base_BEFORE_CALL_97 Int) (v_main_~i~1_BEFORE_CALL_111 Int) (v_main_~x~0.offset_BEFORE_CALL_97 Int) (|v_old(#length)_BEFORE_CALL_73| (Array Int Int)) (|v_old(#memory_int)_BEFORE_CALL_73| (Array Int (Array Int Int))) (|v_old(#valid)_BEFORE_CALL_73| (Array Int Int))) (and (not (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_97) (+ (* 4 v_main_~i~1_BEFORE_CALL_111) v_main_~x~0.offset_BEFORE_CALL_97)) 0)) (or (and (= (select |v_old(#valid)_BEFORE_CALL_73| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_73| 2) 9) (not (= |v_old(#valid)_BEFORE_CALL_73| |v_old(#length)_BEFORE_CALL_73|)) (= (select |v_old(#valid)_BEFORE_CALL_73| 0) 0) (not (= (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_97) (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (not (= |v_old(#length)_BEFORE_CALL_73| (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (not (= |v_old(#valid)_BEFORE_CALL_73| (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (= (select |v_old(#valid)_BEFORE_CALL_73| 2) 1) (= v_main_~x~0.offset_BEFORE_CALL_97 0) (not (= v_main_~x~0.base_BEFORE_CALL_97 2)) (= (select |v_old(#valid)_BEFORE_CALL_73| v_main_~x~0.base_BEFORE_CALL_97) 0) (= (select |v_old(#length)_BEFORE_CALL_73| 1) 2) (= (select (select |v_old(#memory_int)_BEFORE_CALL_73| 1) 1) 0) (not (= v_main_~x~0.base_BEFORE_CALL_97 |#StackHeapBarrier|)) (not (= |#StackHeapBarrier| 0)) (not (= v_main_~x~0.base_BEFORE_CALL_97 0)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_73| 1) 0)) (= (select (select |#memory_int| v_main_~x~0.base_BEFORE_CALL_97) 0) 0) (not (= v_main_~x~0.base_BEFORE_CALL_97 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= (select |v_old(#valid)_BEFORE_CALL_73| 1) 1) (= (select |v_old(#length)_BEFORE_CALL_73| 2) 9) (= v_main_~i~1_BEFORE_CALL_111 0) (not (= |v_old(#valid)_BEFORE_CALL_73| |v_old(#length)_BEFORE_CALL_73|)) (= (select |v_old(#valid)_BEFORE_CALL_73| 0) 0) (not (= |v_old(#length)_BEFORE_CALL_73| (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (not (= |v_old(#valid)_BEFORE_CALL_73| (select |v_old(#memory_int)_BEFORE_CALL_73| 1))) (= (select |v_old(#valid)_BEFORE_CALL_73| 2) 1) (= v_main_~x~0.offset_BEFORE_CALL_97 0) (not (= v_main_~x~0.base_BEFORE_CALL_97 2)) (= (select |v_old(#valid)_BEFORE_CALL_73| v_main_~x~0.base_BEFORE_CALL_97) 0) (= (select |v_old(#length)_BEFORE_CALL_73| 1) 2) (= (select (select |v_old(#memory_int)_BEFORE_CALL_73| 1) 1) 0) (not (= v_main_~x~0.base_BEFORE_CALL_97 |#StackHeapBarrier|)) (not (= |#StackHeapBarrier| 0)) (not (= v_main_~x~0.base_BEFORE_CALL_97 0)) (= 48 (select (select |v_old(#memory_int)_BEFORE_CALL_73| 1) 0)) (not (= v_main_~x~0.base_BEFORE_CALL_97 1)) (= |#NULL.offset| 0) (= |#NULL.base| 0))))))' at error location [2023-04-01 11:07:51,597 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:51,597 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:07:51,597 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2023-04-01 11:07:51,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166268123] [2023-04-01 11:07:51,597 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:51,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 11:07:51,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:51,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 11:07:51,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1219, Unknown=3, NotChecked=0, Total=1406 [2023-04-01 11:07:51,600 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-01 11:07:51,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:51,772 INFO L93 Difference]: Finished difference Result 92 states and 100 transitions. [2023-04-01 11:07:51,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-01 11:07:51,772 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 60 [2023-04-01 11:07:51,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:51,772 INFO L225 Difference]: With dead ends: 92 [2023-04-01 11:07:51,772 INFO L226 Difference]: Without dead ends: 64 [2023-04-01 11:07:51,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 147 SyntacticMatches, 12 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 692 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=277, Invalid=1700, Unknown=3, NotChecked=0, Total=1980 [2023-04-01 11:07:51,774 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 5 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:51,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 169 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:07:51,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-04-01 11:07:51,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2023-04-01 11:07:51,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 47 states have internal predecessors, (48), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-01 11:07:51,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2023-04-01 11:07:51,783 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2023-04-01 11:07:51,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:51,783 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2023-04-01 11:07:51,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 15 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2023-04-01 11:07:51,783 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2023-04-01 11:07:51,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-04-01 11:07:51,784 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:51,784 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:51,789 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-04-01 11:07:51,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-01 11:07:51,989 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:51,989 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:51,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1126651760, now seen corresponding path program 9 times [2023-04-01 11:07:51,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:51,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474271845] [2023-04-01 11:07:51,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:51,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:52,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:07:52,330 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 12 proven. 85 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-01 11:07:52,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:07:52,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474271845] [2023-04-01 11:07:52,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474271845] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:52,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998569851] [2023-04-01 11:07:52,331 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:07:52,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:52,331 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:07:52,332 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 11:07:52,354 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 11:07:52,430 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:07:52,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:07:52,431 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 34 conjunts are in the unsatisfiable core [2023-04-01 11:07:52,433 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:52,586 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 15 treesize of output 11 [2023-04-01 11:07:53,840 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-01 11:07:53,840 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 23 treesize of output 10 [2023-04-01 11:07:53,878 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 54 proven. 58 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-01 11:07:53,878 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:54,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998569851] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:07:54,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [849390425] [2023-04-01 11:07:54,703 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:07:54,703 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:54,703 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:54,703 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:54,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:54,722 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 43 for LOIs [2023-04-01 11:07:55,082 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2023-04-01 11:07:55,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-01 11:07:55,158 INFO L180 IcfgInterpreter]: Interpretation finished