/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 IntervalDomain -i ../sv-benchmarks/c/array-crafted/zero_sum_m3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 20:51:36,535 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 20:51:36,537 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 20:51:36,578 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 20:51:36,578 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 20:51:36,581 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 20:51:36,584 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 20:51:36,587 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 20:51:36,588 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 20:51:36,593 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 20:51:36,595 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 20:51:36,597 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 20:51:36,597 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 20:51:36,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 20:51:36,600 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 20:51:36,601 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 20:51:36,601 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 20:51:36,602 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 20:51:36,604 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 20:51:36,607 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 20:51:36,608 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 20:51:36,611 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 20:51:36,612 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 20:51:36,613 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 20:51:36,620 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 20:51:36,621 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 20:51:36,621 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 20:51:36,621 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 20:51:36,622 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 20:51:36,623 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 20:51:36,623 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 20:51:36,623 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 20:51:36,625 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 20:51:36,627 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 20:51:36,628 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 20:51:36,628 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 20:51:36,629 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 20:51:36,629 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 20:51:36,629 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 20:51:36,630 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 20:51:36,630 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 20:51:36,632 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 [2023-03-31 20:51:36,651 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 20:51:36,651 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 20:51:36,651 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 20:51:36,652 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 20:51:36,652 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 20:51:36,652 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 20:51:36,652 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 20:51:36,653 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 20:51:36,653 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 20:51:36,653 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 20:51:36,653 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 20:51:36,653 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 20:51:36,653 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 20:51:36,653 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 20:51:36,653 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 20:51:36,654 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 20:51:36,654 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 20:51:36,654 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 20:51:36,654 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 20:51:36,654 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 20:51:36,655 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 20:51:36,656 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 20:51:36,656 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 20:51:36,656 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 20:51:36,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:51:36,656 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 20:51:36,656 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 20:51:36,656 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 20:51:36,656 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 20:51:36,657 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 20:51:36,657 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 20:51:36,657 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 20:51:36,657 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 20:51:36,657 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 20:51:36,874 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 20:51:36,895 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 20:51:36,897 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 20:51:36,899 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 20:51:36,900 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 20:51:36,901 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum_m3.c [2023-03-31 20:51:38,001 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 20:51:38,158 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 20:51:38,158 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_m3.c [2023-03-31 20:51:38,163 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ec106024/d2b42d2dfed04485a4fab1d99b2fa4cc/FLAGaf3ecbbea [2023-03-31 20:51:38,176 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ec106024/d2b42d2dfed04485a4fab1d99b2fa4cc [2023-03-31 20:51:38,179 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 20:51:38,180 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 20:51:38,181 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 20:51:38,181 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 20:51:38,184 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 20:51:38,184 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,185 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e55f4eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38, skipping insertion in model container [2023-03-31 20:51:38,185 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,191 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 20:51:38,202 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 20:51:38,317 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_m3.c[402,415] [2023-03-31 20:51:38,331 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:51:38,342 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 20:51:38,356 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_m3.c[402,415] [2023-03-31 20:51:38,365 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:51:38,377 INFO L208 MainTranslator]: Completed translation [2023-03-31 20:51:38,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38 WrapperNode [2023-03-31 20:51:38,377 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 20:51:38,378 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 20:51:38,378 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 20:51:38,378 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 20:51:38,389 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,395 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,395 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,402 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,405 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,407 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,407 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,409 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 20:51:38,410 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 20:51:38,410 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 20:51:38,410 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 20:51:38,411 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (1/1) ... [2023-03-31 20:51:38,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:51:38,426 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:38,445 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) [2023-03-31 20:51:38,452 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 [2023-03-31 20:51:38,475 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 20:51:38,475 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 20:51:38,475 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 20:51:38,475 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-03-31 20:51:38,476 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 20:51:38,476 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 20:51:38,476 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 20:51:38,476 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 20:51:38,476 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 20:51:38,476 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 20:51:38,476 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-03-31 20:51:38,476 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 20:51:38,477 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 20:51:38,532 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 20:51:38,534 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 20:51:38,727 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 20:51:38,776 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 20:51:38,776 INFO L302 CfgBuilder]: Removed 7 assume(true) statements. [2023-03-31 20:51:38,779 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:51:38 BoogieIcfgContainer [2023-03-31 20:51:38,779 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 20:51:38,781 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 20:51:38,781 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 20:51:38,784 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 20:51:38,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 08:51:38" (1/3) ... [2023-03-31 20:51:38,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18b1681a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:51:38, skipping insertion in model container [2023-03-31 20:51:38,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:38" (2/3) ... [2023-03-31 20:51:38,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18b1681a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:51:38, skipping insertion in model container [2023-03-31 20:51:38,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:51:38" (3/3) ... [2023-03-31 20:51:38,806 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m3.c [2023-03-31 20:51:38,838 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 20:51:38,839 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 20:51:38,944 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 20:51:38,950 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;@4990d3f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 20:51:38,950 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 20:51:38,954 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.588235294117647) internal successors, (27), 18 states have internal predecessors, (27), 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) [2023-03-31 20:51:38,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-03-31 20:51:38,962 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:38,962 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:38,963 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:38,967 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:38,968 INFO L85 PathProgramCache]: Analyzing trace with hash -54699181, now seen corresponding path program 1 times [2023-03-31 20:51:38,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:38,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235565733] [2023-03-31 20:51:38,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:38,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:39,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:39,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:39,281 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:39,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235565733] [2023-03-31 20:51:39,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235565733] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:51:39,283 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:51:39,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 20:51:39,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496172887] [2023-03-31 20:51:39,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:51:39,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 20:51:39,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:39,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 20:51:39,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 20:51:39,324 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.588235294117647) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:39,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:39,413 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2023-03-31 20:51:39,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 20:51:39,415 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2023-03-31 20:51:39,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:39,419 INFO L225 Difference]: With dead ends: 44 [2023-03-31 20:51:39,420 INFO L226 Difference]: Without dead ends: 19 [2023-03-31 20:51:39,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 20:51:39,425 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:39,426 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:39,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-03-31 20:51:39,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-03-31 20:51:39,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:39,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2023-03-31 20:51:39,452 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 17 [2023-03-31 20:51:39,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:39,452 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2023-03-31 20:51:39,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:39,453 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2023-03-31 20:51:39,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-03-31 20:51:39,454 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:39,454 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:39,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 20:51:39,454 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:39,455 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:39,455 INFO L85 PathProgramCache]: Analyzing trace with hash -1205809628, now seen corresponding path program 1 times [2023-03-31 20:51:39,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:39,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001591659] [2023-03-31 20:51:39,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:39,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:39,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:39,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 20:51:39,544 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:39,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001591659] [2023-03-31 20:51:39,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001591659] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:51:39,545 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:51:39,545 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-03-31 20:51:39,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351583596] [2023-03-31 20:51:39,545 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:51:39,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-03-31 20:51:39,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:39,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-03-31 20:51:39,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-03-31 20:51:39,548 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:39,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:39,591 INFO L93 Difference]: Finished difference Result 35 states and 51 transitions. [2023-03-31 20:51:39,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 20:51:39,592 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-03-31 20:51:39,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:39,593 INFO L225 Difference]: With dead ends: 35 [2023-03-31 20:51:39,593 INFO L226 Difference]: Without dead ends: 25 [2023-03-31 20:51:39,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-03-31 20:51:39,599 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:39,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 15 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:39,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-03-31 20:51:39,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-03-31 20:51:39,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:39,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2023-03-31 20:51:39,617 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 18 [2023-03-31 20:51:39,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:39,617 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2023-03-31 20:51:39,617 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:39,618 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2023-03-31 20:51:39,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-03-31 20:51:39,618 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:39,618 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:39,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 20:51:39,619 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:39,619 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:39,620 INFO L85 PathProgramCache]: Analyzing trace with hash 876405612, now seen corresponding path program 1 times [2023-03-31 20:51:39,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:39,620 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358643278] [2023-03-31 20:51:39,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:39,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:39,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:39,794 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 20:51:39,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:39,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358643278] [2023-03-31 20:51:39,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358643278] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:39,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795346462] [2023-03-31 20:51:39,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:39,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:39,795 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:39,800 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) [2023-03-31 20:51:39,802 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 20:51:39,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:39,902 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:51:39,909 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:39,983 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 20:51:39,983 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:40,035 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 20:51:40,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795346462] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:40,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1291557594] [2023-03-31 20:51:40,074 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:51:40,074 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:40,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:40,083 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:40,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:40,195 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:51:40,525 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:51:40,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:51:40,549 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:40,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '389#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:40,831 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:40,831 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:40,831 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-03-31 20:51:40,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306921825] [2023-03-31 20:51:40,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:40,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-03-31 20:51:40,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:40,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-03-31 20:51:40,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-03-31 20:51:40,836 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:40,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:40,892 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2023-03-31 20:51:40,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 20:51:40,893 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-03-31 20:51:40,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:40,894 INFO L225 Difference]: With dead ends: 43 [2023-03-31 20:51:40,894 INFO L226 Difference]: Without dead ends: 26 [2023-03-31 20:51:40,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-03-31 20:51:40,897 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:40,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:40,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-03-31 20:51:40,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-03-31 20:51:40,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 21 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:40,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2023-03-31 20:51:40,904 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 24 [2023-03-31 20:51:40,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:40,904 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2023-03-31 20:51:40,904 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:40,904 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2023-03-31 20:51:40,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-03-31 20:51:40,905 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:40,905 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:40,913 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:41,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:41,112 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:41,112 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:41,112 INFO L85 PathProgramCache]: Analyzing trace with hash -2008362117, now seen corresponding path program 2 times [2023-03-31 20:51:41,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:41,113 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886176470] [2023-03-31 20:51:41,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:41,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:41,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:41,243 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 20:51:41,244 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:41,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886176470] [2023-03-31 20:51:41,244 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886176470] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:41,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591022930] [2023-03-31 20:51:41,244 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:51:41,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:41,245 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:41,246 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) [2023-03-31 20:51:41,248 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 20:51:41,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-03-31 20:51:41,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:41,313 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:51:41,315 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:41,354 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 20:51:41,355 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:41,393 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 20:51:41,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591022930] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:41,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1356637093] [2023-03-31 20:51:41,396 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:51:41,396 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:41,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:41,397 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:41,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:41,437 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:51:41,595 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:51:41,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:51:41,608 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:41,874 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '680#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:41,874 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:41,874 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:41,875 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-03-31 20:51:41,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293557930] [2023-03-31 20:51:41,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:41,875 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-03-31 20:51:41,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:41,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-03-31 20:51:41,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2023-03-31 20:51:41,876 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:41,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:41,934 INFO L93 Difference]: Finished difference Result 47 states and 63 transitions. [2023-03-31 20:51:41,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-03-31 20:51:41,938 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-03-31 20:51:41,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:41,938 INFO L225 Difference]: With dead ends: 47 [2023-03-31 20:51:41,938 INFO L226 Difference]: Without dead ends: 32 [2023-03-31 20:51:41,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2023-03-31 20:51:41,940 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:41,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 18 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:41,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-03-31 20:51:41,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-03-31 20:51:41,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:41,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2023-03-31 20:51:41,950 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 25 [2023-03-31 20:51:41,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:41,950 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2023-03-31 20:51:41,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 8 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:41,951 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2023-03-31 20:51:41,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-03-31 20:51:41,952 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:41,952 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:41,961 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:42,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-03-31 20:51:42,159 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:42,159 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:42,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1517129357, now seen corresponding path program 3 times [2023-03-31 20:51:42,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:42,159 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943739248] [2023-03-31 20:51:42,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:42,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:42,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:44,376 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:44,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:44,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943739248] [2023-03-31 20:51:44,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943739248] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:44,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514820489] [2023-03-31 20:51:44,377 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:51:44,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:44,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:44,379 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) [2023-03-31 20:51:44,410 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 20:51:44,457 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:51:44,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:44,459 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 64 conjunts are in the unsatisfiable core [2023-03-31 20:51:44,464 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:44,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-03-31 20:51:44,866 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 20:51:44,869 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 20:51:44,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2023-03-31 20:51:44,942 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:44,942 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:45,621 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 20:51:45,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514820489] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:45,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [948852283] [2023-03-31 20:51:45,624 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:51:45,624 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:45,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:45,625 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:45,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:45,647 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:51:45,760 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:51:45,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:51:45,769 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:46,309 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1057#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:46,309 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:46,309 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:46,309 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 20] total 38 [2023-03-31 20:51:46,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240621098] [2023-03-31 20:51:46,310 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:46,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-03-31 20:51:46,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:46,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-03-31 20:51:46,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2218, Unknown=0, NotChecked=0, Total=2352 [2023-03-31 20:51:46,312 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 36 states have internal predecessors, (49), 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) [2023-03-31 20:51:46,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:46,810 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2023-03-31 20:51:46,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-03-31 20:51:46,810 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 36 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2023-03-31 20:51:46,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:46,811 INFO L225 Difference]: With dead ends: 53 [2023-03-31 20:51:46,811 INFO L226 Difference]: Without dead ends: 48 [2023-03-31 20:51:46,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 56 SyntacticMatches, 14 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=140, Invalid=2310, Unknown=0, NotChecked=0, Total=2450 [2023-03-31 20:51:46,813 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 818 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:46,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 166 Invalid, 819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 818 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-03-31 20:51:46,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-03-31 20:51:46,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2023-03-31 20:51:46,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 41 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:46,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2023-03-31 20:51:46,826 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 31 [2023-03-31 20:51:46,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:46,826 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2023-03-31 20:51:46,826 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 36 states have internal predecessors, (49), 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) [2023-03-31 20:51:46,827 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2023-03-31 20:51:46,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-03-31 20:51:46,828 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:46,828 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:46,837 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-03-31 20:51:47,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:47,033 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:47,034 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:47,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1421216939, now seen corresponding path program 4 times [2023-03-31 20:51:47,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:47,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472726079] [2023-03-31 20:51:47,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:47,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:47,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:47,148 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 20:51:47,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:47,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472726079] [2023-03-31 20:51:47,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472726079] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:47,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069620198] [2023-03-31 20:51:47,148 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:51:47,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:47,149 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:47,150 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) [2023-03-31 20:51:47,152 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 20:51:47,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:47,210 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 20:51:47,212 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:47,261 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 20:51:47,261 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:47,300 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 20:51:47,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069620198] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:47,301 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [193790777] [2023-03-31 20:51:47,304 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:51:47,307 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:47,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:47,308 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:47,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:47,336 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:51:47,461 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:51:47,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:51:47,470 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:47,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1457#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:47,736 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:47,736 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:47,736 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-03-31 20:51:47,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722971784] [2023-03-31 20:51:47,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:47,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-03-31 20:51:47,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:47,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-03-31 20:51:47,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2023-03-31 20:51:47,738 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:47,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:47,881 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2023-03-31 20:51:47,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-03-31 20:51:47,881 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2023-03-31 20:51:47,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:47,882 INFO L225 Difference]: With dead ends: 86 [2023-03-31 20:51:47,882 INFO L226 Difference]: Without dead ends: 47 [2023-03-31 20:51:47,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=98, Invalid=604, Unknown=0, NotChecked=0, Total=702 [2023-03-31 20:51:47,883 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:47,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 41 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:47,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-03-31 20:51:47,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-03-31 20:51:47,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:47,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 58 transitions. [2023-03-31 20:51:47,891 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 58 transitions. Word has length 32 [2023-03-31 20:51:47,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:47,891 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 58 transitions. [2023-03-31 20:51:47,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:47,891 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 58 transitions. [2023-03-31 20:51:47,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-03-31 20:51:47,892 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:47,892 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:47,904 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:48,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:48,093 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:48,093 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:48,093 INFO L85 PathProgramCache]: Analyzing trace with hash 601259450, now seen corresponding path program 5 times [2023-03-31 20:51:48,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:48,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701195998] [2023-03-31 20:51:48,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:48,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:48,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:48,195 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-03-31 20:51:48,196 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:48,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701195998] [2023-03-31 20:51:48,196 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701195998] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:48,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909271757] [2023-03-31 20:51:48,196 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:51:48,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:48,196 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:48,197 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) [2023-03-31 20:51:48,200 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 20:51:48,262 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 20:51:48,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:48,264 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 20:51:48,265 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:48,326 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-03-31 20:51:48,326 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:48,384 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-03-31 20:51:48,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909271757] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:48,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1933484766] [2023-03-31 20:51:48,387 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:51:48,387 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:48,387 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:48,387 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:48,387 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:48,406 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:51:48,502 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:51:48,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:51:48,512 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:48,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1936#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:48,760 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:48,760 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:48,761 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-03-31 20:51:48,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185998846] [2023-03-31 20:51:48,761 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:48,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-03-31 20:51:48,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:48,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-03-31 20:51:48,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2023-03-31 20:51:48,762 INFO L87 Difference]: Start difference. First operand 47 states and 58 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:48,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:48,905 INFO L93 Difference]: Finished difference Result 70 states and 90 transitions. [2023-03-31 20:51:48,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-03-31 20:51:48,906 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2023-03-31 20:51:48,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:48,908 INFO L225 Difference]: With dead ends: 70 [2023-03-31 20:51:48,908 INFO L226 Difference]: Without dead ends: 39 [2023-03-31 20:51:48,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 78 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=684, Unknown=0, NotChecked=0, Total=812 [2023-03-31 20:51:48,910 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 76 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:48,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 60 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:48,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-03-31 20:51:48,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-03-31 20:51:48,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:48,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2023-03-31 20:51:48,922 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 33 [2023-03-31 20:51:48,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:48,923 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2023-03-31 20:51:48,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:48,923 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2023-03-31 20:51:48,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-03-31 20:51:48,925 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:48,925 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:48,932 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:49,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:49,132 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:49,133 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:49,133 INFO L85 PathProgramCache]: Analyzing trace with hash -1520925364, now seen corresponding path program 6 times [2023-03-31 20:51:49,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:49,133 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507439922] [2023-03-31 20:51:49,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:49,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:49,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:51,774 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:51,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:51,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507439922] [2023-03-31 20:51:51,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507439922] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:51,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006793076] [2023-03-31 20:51:51,775 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:51:51,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:51,775 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:51,776 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) [2023-03-31 20:51:51,783 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 20:51:51,849 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:51:51,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:51,851 INFO L262 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 90 conjunts are in the unsatisfiable core [2023-03-31 20:51:51,855 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:51,878 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-03-31 20:51:52,761 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 20:51:52,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 20:51:52,763 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 20:51:52,767 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 20:51:52,767 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 23 [2023-03-31 20:51:52,869 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:52,869 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:54,198 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 20:51:54,198 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1006793076] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:54,198 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1285061583] [2023-03-31 20:51:54,200 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:51:54,200 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:54,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:54,200 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:54,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:54,244 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:51:54,324 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:51:54,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:51:54,332 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:54,989 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2452#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:54,989 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:54,990 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:54,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 28, 26] total 67 [2023-03-31 20:51:54,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204336235] [2023-03-31 20:51:54,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:54,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2023-03-31 20:51:54,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:54,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2023-03-31 20:51:54,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=5766, Unknown=0, NotChecked=0, Total=6006 [2023-03-31 20:51:54,993 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 67 states, 67 states have (on average 1.2238805970149254) internal successors, (82), 65 states have internal predecessors, (82), 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) [2023-03-31 20:51:56,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:56,977 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2023-03-31 20:51:56,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-03-31 20:51:56,978 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.2238805970149254) internal successors, (82), 65 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2023-03-31 20:51:56,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:56,978 INFO L225 Difference]: With dead ends: 65 [2023-03-31 20:51:56,979 INFO L226 Difference]: Without dead ends: 60 [2023-03-31 20:51:56,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 60 SyntacticMatches, 9 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2278 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=365, Invalid=8191, Unknown=0, NotChecked=0, Total=8556 [2023-03-31 20:51:56,982 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 1893 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 1927 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1893 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:56,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 290 Invalid, 1927 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1893 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-03-31 20:51:56,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-03-31 20:51:56,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2023-03-31 20:51:56,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:56,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2023-03-31 20:51:56,991 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 38 [2023-03-31 20:51:56,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:56,991 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2023-03-31 20:51:56,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.2238805970149254) internal successors, (82), 65 states have internal predecessors, (82), 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) [2023-03-31 20:51:56,992 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2023-03-31 20:51:56,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-03-31 20:51:56,992 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:56,992 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:56,998 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:57,201 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:57,201 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:57,201 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:57,202 INFO L85 PathProgramCache]: Analyzing trace with hash 1160192002, now seen corresponding path program 7 times [2023-03-31 20:51:57,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:57,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588446628] [2023-03-31 20:51:57,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:57,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:57,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:57,316 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-03-31 20:51:57,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:57,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588446628] [2023-03-31 20:51:57,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588446628] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:57,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829156606] [2023-03-31 20:51:57,316 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:51:57,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:57,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:57,318 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) [2023-03-31 20:51:57,320 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-03-31 20:51:57,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:57,392 INFO L262 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 20:51:57,397 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:57,466 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-03-31 20:51:57,466 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:57,524 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-03-31 20:51:57,524 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829156606] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:57,524 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [175953401] [2023-03-31 20:51:57,530 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:51:57,530 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:57,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:57,531 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:57,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:57,547 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:51:57,623 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:51:57,627 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:51:57,630 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:57,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2971#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:57,906 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:57,906 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:57,906 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2023-03-31 20:51:57,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918149861] [2023-03-31 20:51:57,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:57,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-03-31 20:51:57,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:57,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-03-31 20:51:57,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=606, Unknown=0, NotChecked=0, Total=702 [2023-03-31 20:51:57,908 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:58,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:58,092 INFO L93 Difference]: Finished difference Result 108 states and 130 transitions. [2023-03-31 20:51:58,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-03-31 20:51:58,092 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2023-03-31 20:51:58,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:58,093 INFO L225 Difference]: With dead ends: 108 [2023-03-31 20:51:58,093 INFO L226 Difference]: Without dead ends: 58 [2023-03-31 20:51:58,094 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 95 SyntacticMatches, 6 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2023-03-31 20:51:58,094 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:58,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 23 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:58,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-03-31 20:51:58,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-03-31 20:51:58,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 53 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:58,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2023-03-31 20:51:58,105 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 39 [2023-03-31 20:51:58,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:58,105 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2023-03-31 20:51:58,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:58,105 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2023-03-31 20:51:58,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-03-31 20:51:58,106 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:58,106 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:58,114 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:58,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:58,306 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:58,307 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:58,307 INFO L85 PathProgramCache]: Analyzing trace with hash -1392037869, now seen corresponding path program 8 times [2023-03-31 20:51:58,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:58,307 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780023833] [2023-03-31 20:51:58,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:58,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:58,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:58,453 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-03-31 20:51:58,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:58,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780023833] [2023-03-31 20:51:58,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [780023833] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:58,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1481767245] [2023-03-31 20:51:58,465 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:51:58,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:58,465 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:58,466 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) [2023-03-31 20:51:58,490 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-03-31 20:51:58,550 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 20:51:58,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:58,551 INFO L262 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 20:51:58,553 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:58,625 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-03-31 20:51:58,626 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:58,692 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-03-31 20:51:58,692 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1481767245] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:58,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1828718795] [2023-03-31 20:51:58,694 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:51:58,694 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:58,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:58,695 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:58,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:58,712 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:51:58,783 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:51:58,788 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:51:58,791 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:59,044 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3563#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:59,045 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:59,045 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:59,045 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-03-31 20:51:59,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075562396] [2023-03-31 20:51:59,045 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:59,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-03-31 20:51:59,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:59,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-03-31 20:51:59,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2023-03-31 20:51:59,046 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:59,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:59,163 INFO L93 Difference]: Finished difference Result 85 states and 105 transitions. [2023-03-31 20:51:59,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 20:51:59,163 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2023-03-31 20:51:59,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:59,164 INFO L225 Difference]: With dead ends: 85 [2023-03-31 20:51:59,164 INFO L226 Difference]: Without dead ends: 46 [2023-03-31 20:51:59,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 96 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 20:51:59,165 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 178 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:59,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [178 Valid, 38 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:59,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-03-31 20:51:59,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-03-31 20:51:59,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:59,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2023-03-31 20:51:59,171 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 40 [2023-03-31 20:51:59,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:59,171 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2023-03-31 20:51:59,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:59,172 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2023-03-31 20:51:59,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-03-31 20:51:59,172 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:59,172 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:59,183 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-03-31 20:51:59,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-03-31 20:51:59,378 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:59,378 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:59,378 INFO L85 PathProgramCache]: Analyzing trace with hash -1068351597, now seen corresponding path program 9 times [2023-03-31 20:51:59,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:59,378 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480179661] [2023-03-31 20:51:59,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:59,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:59,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:02,710 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:02,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:02,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480179661] [2023-03-31 20:52:02,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480179661] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:52:02,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81106776] [2023-03-31 20:52:02,711 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:52:02,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:02,711 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:02,717 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) [2023-03-31 20:52:02,722 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-03-31 20:52:02,798 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:52:02,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:52:02,800 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 118 conjunts are in the unsatisfiable core [2023-03-31 20:52:02,802 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:02,828 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 [2023-03-31 20:52:03,979 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:03,980 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:06,116 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-03-31 20:52:06,117 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81106776] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:06,117 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2018705966] [2023-03-31 20:52:06,118 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:52:06,118 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:06,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:06,118 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:06,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:06,134 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:52:06,198 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:52:06,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:52:06,205 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:07,015 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4186#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:52:07,015 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:07,015 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:52:07,015 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 35, 32] total 86 [2023-03-31 20:52:07,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344358831] [2023-03-31 20:52:07,016 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:07,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2023-03-31 20:52:07,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:07,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2023-03-31 20:52:07,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=8999, Unknown=0, NotChecked=0, Total=9312 [2023-03-31 20:52:07,020 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 86 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 84 states have internal predecessors, (101), 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) [2023-03-31 20:52:11,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:11,151 INFO L93 Difference]: Finished difference Result 109 states and 129 transitions. [2023-03-31 20:52:11,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-03-31 20:52:11,152 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 84 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2023-03-31 20:52:11,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:11,154 INFO L225 Difference]: With dead ends: 109 [2023-03-31 20:52:11,154 INFO L226 Difference]: Without dead ends: 104 [2023-03-31 20:52:11,157 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3787 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=663, Invalid=15593, Unknown=0, NotChecked=0, Total=16256 [2023-03-31 20:52:11,158 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 11 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 3003 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 3100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 3003 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:11,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 353 Invalid, 3100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 3003 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-03-31 20:52:11,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-03-31 20:52:11,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 75. [2023-03-31 20:52:11,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.2142857142857142) internal successors, (85), 70 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:11,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2023-03-31 20:52:11,175 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 45 [2023-03-31 20:52:11,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:11,175 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2023-03-31 20:52:11,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 84 states have internal predecessors, (101), 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) [2023-03-31 20:52:11,175 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2023-03-31 20:52:11,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-03-31 20:52:11,175 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:11,176 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:11,180 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:11,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:11,377 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:11,377 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:11,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1573715998, now seen corresponding path program 10 times [2023-03-31 20:52:11,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:11,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997236275] [2023-03-31 20:52:11,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:11,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:11,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:11,529 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-03-31 20:52:11,530 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:11,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997236275] [2023-03-31 20:52:11,530 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997236275] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:52:11,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592147864] [2023-03-31 20:52:11,530 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:52:11,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:11,530 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:11,533 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) [2023-03-31 20:52:11,556 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-03-31 20:52:11,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:11,619 INFO L262 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 20:52:11,620 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:11,730 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-03-31 20:52:11,731 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:11,812 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-03-31 20:52:11,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592147864] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:11,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1444917046] [2023-03-31 20:52:11,814 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:52:11,814 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:11,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:11,815 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:11,815 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:11,832 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:52:11,909 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:52:11,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:52:11,917 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:12,164 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4907#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:52:12,165 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:12,165 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:52:12,165 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-03-31 20:52:12,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681010360] [2023-03-31 20:52:12,165 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:12,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-03-31 20:52:12,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:12,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-03-31 20:52:12,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2023-03-31 20:52:12,166 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:12,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:12,379 INFO L93 Difference]: Finished difference Result 148 states and 175 transitions. [2023-03-31 20:52:12,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-03-31 20:52:12,379 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2023-03-31 20:52:12,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:12,380 INFO L225 Difference]: With dead ends: 148 [2023-03-31 20:52:12,380 INFO L226 Difference]: Without dead ends: 70 [2023-03-31 20:52:12,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 112 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=189, Invalid=1071, Unknown=0, NotChecked=0, Total=1260 [2023-03-31 20:52:12,382 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:12,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 49 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:52:12,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-03-31 20:52:12,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2023-03-31 20:52:12,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.2) internal successors, (78), 65 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:12,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 82 transitions. [2023-03-31 20:52:12,398 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 82 transitions. Word has length 46 [2023-03-31 20:52:12,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:12,398 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 82 transitions. [2023-03-31 20:52:12,399 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 20 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:12,399 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 82 transitions. [2023-03-31 20:52:12,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-03-31 20:52:12,399 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:12,399 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:12,405 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:12,605 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-03-31 20:52:12,605 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:12,605 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:12,605 INFO L85 PathProgramCache]: Analyzing trace with hash 1387195117, now seen corresponding path program 11 times [2023-03-31 20:52:12,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:12,605 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261769429] [2023-03-31 20:52:12,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:12,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:12,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:12,744 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-03-31 20:52:12,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:12,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261769429] [2023-03-31 20:52:12,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1261769429] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:52:12,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154226234] [2023-03-31 20:52:12,744 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:52:12,744 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:12,744 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:12,745 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:12,770 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-03-31 20:52:12,845 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-03-31 20:52:12,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:52:12,847 INFO L262 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 20:52:12,848 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:12,957 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-03-31 20:52:12,957 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:13,055 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-03-31 20:52:13,055 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154226234] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:13,055 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [348662820] [2023-03-31 20:52:13,056 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:52:13,056 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:13,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:13,057 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:13,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:13,076 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:52:13,145 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:52:13,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:52:13,153 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:13,389 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5650#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:52:13,389 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:13,389 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:52:13,390 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-03-31 20:52:13,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218722946] [2023-03-31 20:52:13,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:13,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-03-31 20:52:13,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:13,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-03-31 20:52:13,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2023-03-31 20:52:13,391 INFO L87 Difference]: Start difference. First operand 70 states and 82 transitions. Second operand has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 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) [2023-03-31 20:52:13,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:13,553 INFO L93 Difference]: Finished difference Result 106 states and 128 transitions. [2023-03-31 20:52:13,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-03-31 20:52:13,554 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2023-03-31 20:52:13,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:13,554 INFO L225 Difference]: With dead ends: 106 [2023-03-31 20:52:13,554 INFO L226 Difference]: Without dead ends: 59 [2023-03-31 20:52:13,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 114 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=227, Invalid=1105, Unknown=0, NotChecked=0, Total=1332 [2023-03-31 20:52:13,556 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 51 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:13,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 68 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:52:13,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-03-31 20:52:13,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 53. [2023-03-31 20:52:13,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 48 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:13,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2023-03-31 20:52:13,568 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 47 [2023-03-31 20:52:13,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:13,568 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2023-03-31 20:52:13,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 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) [2023-03-31 20:52:13,569 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2023-03-31 20:52:13,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-03-31 20:52:13,569 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:13,569 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:13,577 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:13,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-03-31 20:52:13,773 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:13,773 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:13,773 INFO L85 PathProgramCache]: Analyzing trace with hash 1802399532, now seen corresponding path program 12 times [2023-03-31 20:52:13,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:13,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123228317] [2023-03-31 20:52:13,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:13,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:13,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:18,384 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 1 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:18,384 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:18,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123228317] [2023-03-31 20:52:18,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123228317] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:52:18,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640022769] [2023-03-31 20:52:18,385 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:52:18,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:18,385 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:18,386 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:18,387 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-03-31 20:52:18,474 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:52:18,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:52:18,478 INFO L262 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 142 conjunts are in the unsatisfiable core [2023-03-31 20:52:18,491 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:18,526 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 [2023-03-31 20:52:20,275 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:20,275 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:23,391 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 20:52:23,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640022769] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:23,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [747602653] [2023-03-31 20:52:23,392 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:52:23,392 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:23,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:23,392 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:23,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:23,416 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 20:52:23,483 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-03-31 20:52:23,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 20:52:23,488 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:24,502 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6390#(and (<= ~SIZE~0 32767) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:52:24,502 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:24,502 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:52:24,502 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 42, 38] total 103 [2023-03-31 20:52:24,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652208705] [2023-03-31 20:52:24,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:24,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2023-03-31 20:52:24,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:24,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2023-03-31 20:52:24,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=12504, Unknown=0, NotChecked=0, Total=12882 [2023-03-31 20:52:24,506 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand has 103 states, 103 states have (on average 1.145631067961165) internal successors, (118), 101 states have internal predecessors, (118), 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) [2023-03-31 20:52:30,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:30,630 INFO L93 Difference]: Finished difference Result 121 states and 141 transitions. [2023-03-31 20:52:30,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2023-03-31 20:52:30,630 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.145631067961165) internal successors, (118), 101 states have internal predecessors, (118), 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 52 [2023-03-31 20:52:30,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:30,631 INFO L225 Difference]: With dead ends: 121 [2023-03-31 20:52:30,631 INFO L226 Difference]: Without dead ends: 116 [2023-03-31 20:52:30,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 82 SyntacticMatches, 7 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5725 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=993, Invalid=23187, Unknown=0, NotChecked=0, Total=24180 [2023-03-31 20:52:30,635 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 15 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 3988 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 4144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 3988 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:30,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 392 Invalid, 4144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 3988 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-03-31 20:52:30,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-03-31 20:52:30,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 73. [2023-03-31 20:52:30,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.161764705882353) internal successors, (79), 68 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:30,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 83 transitions. [2023-03-31 20:52:30,657 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 83 transitions. Word has length 52 [2023-03-31 20:52:30,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:30,657 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 83 transitions. [2023-03-31 20:52:30,658 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.145631067961165) internal successors, (118), 101 states have internal predecessors, (118), 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) [2023-03-31 20:52:30,658 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 83 transitions. [2023-03-31 20:52:30,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-03-31 20:52:30,658 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:30,658 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:30,666 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:30,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-03-31 20:52:30,864 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:30,864 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:30,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1319543781, now seen corresponding path program 13 times [2023-03-31 20:52:30,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:30,865 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071894682] [2023-03-31 20:52:30,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:30,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:30,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:31,063 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-03-31 20:52:31,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:31,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071894682] [2023-03-31 20:52:31,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071894682] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:52:31,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1775078112] [2023-03-31 20:52:31,063 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:52:31,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:31,063 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:31,065 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:31,093 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-03-31 20:52:31,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:31,165 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 14 conjunts are in the unsatisfiable core [2023-03-31 20:52:31,167 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:31,284 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-03-31 20:52:31,285 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:31,373 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-03-31 20:52:31,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1775078112] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:31,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [746444621] [2023-03-31 20:52:31,374 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-03-31 20:52:31,374 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:31,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:31,374 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:31,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs