/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_const_m2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 20:51:13,658 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 20:51:13,660 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 20:51:13,687 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 20:51:13,688 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 20:51:13,689 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 20:51:13,690 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 20:51:13,692 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 20:51:13,693 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 20:51:13,694 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 20:51:13,695 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 20:51:13,696 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 20:51:13,696 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 20:51:13,697 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 20:51:13,698 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 20:51:13,699 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 20:51:13,699 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 20:51:13,700 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 20:51:13,702 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 20:51:13,703 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 20:51:13,705 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 20:51:13,706 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 20:51:13,707 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 20:51:13,707 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 20:51:13,710 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 20:51:13,711 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 20:51:13,711 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 20:51:13,712 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 20:51:13,712 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 20:51:13,713 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 20:51:13,713 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 20:51:13,714 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 20:51:13,715 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 20:51:13,715 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 20:51:13,716 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 20:51:13,716 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 20:51:13,717 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 20:51:13,717 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 20:51:13,718 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 20:51:13,718 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 20:51:13,719 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 20:51:13,720 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 20:51:13,751 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 20:51:13,751 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 20:51:13,751 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 20:51:13,751 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 20:51:13,752 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 20:51:13,752 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 20:51:13,752 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 20:51:13,753 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 20:51:13,753 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 20:51:13,753 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 20:51:13,753 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 20:51:13,753 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 20:51:13,753 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 20:51:13,754 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 20:51:13,754 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 20:51:13,754 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 20:51:13,754 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 20:51:13,754 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 20:51:13,755 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 20:51:13,755 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 20:51:13,755 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 20:51:13,755 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 20:51:13,756 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 20:51:13,756 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 20:51:13,756 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 20:51:13,756 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 20:51:13,756 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 20:51:13,760 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 20:51:13,761 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 20:51:13,761 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 20:51:13,761 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 20:51:13,761 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 20:51:13,761 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:51:13,762 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 20:51:13,762 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 20:51:13,762 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 20:51:13,763 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 20:51:13,763 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 20:51:13,763 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 20:51:13,763 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 20:51:13,763 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 20:51:13,763 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 20:51:13,951 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 20:51:13,979 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 20:51:13,981 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 20:51:13,983 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 20:51:13,983 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 20:51:13,985 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum_const_m2.c [2023-03-31 20:51:15,253 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 20:51:15,426 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 20:51:15,426 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const_m2.c [2023-03-31 20:51:15,431 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f73393312/9c4fb47f0a2f48a7925c7cf5101111ee/FLAG147e7b8de [2023-03-31 20:51:15,443 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f73393312/9c4fb47f0a2f48a7925c7cf5101111ee [2023-03-31 20:51:15,444 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 20:51:15,446 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 20:51:15,447 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 20:51:15,447 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 20:51:15,451 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 20:51:15,451 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,452 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53d90f46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15, skipping insertion in model container [2023-03-31 20:51:15,452 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,458 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 20:51:15,469 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 20:51:15,571 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const_m2.c[408,421] [2023-03-31 20:51:15,585 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:51:15,593 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 20:51:15,602 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum_const_m2.c[408,421] [2023-03-31 20:51:15,607 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:51:15,621 INFO L208 MainTranslator]: Completed translation [2023-03-31 20:51:15,621 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15 WrapperNode [2023-03-31 20:51:15,621 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 20:51:15,622 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 20:51:15,622 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 20:51:15,622 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 20:51:15,630 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,630 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,636 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,636 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,641 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,645 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,646 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,647 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,649 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 20:51:15,650 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 20:51:15,650 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 20:51:15,650 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 20:51:15,651 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (1/1) ... [2023-03-31 20:51:15,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:51:15,665 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:15,676 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 20:51:15,681 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 20:51:15,716 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 20:51:15,717 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 20:51:15,717 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 20:51:15,717 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-03-31 20:51:15,717 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 20:51:15,717 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 20:51:15,717 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 20:51:15,718 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 20:51:15,718 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 20:51:15,718 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 20:51:15,718 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-03-31 20:51:15,718 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 20:51:15,718 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2023-03-31 20:51:15,718 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-03-31 20:51:15,719 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 20:51:15,719 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-03-31 20:51:15,719 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 20:51:15,719 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 20:51:15,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 20:51:15,719 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 20:51:15,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 20:51:15,719 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 20:51:15,778 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 20:51:15,781 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 20:51:15,943 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 20:51:16,001 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 20:51:16,001 INFO L302 CfgBuilder]: Removed 5 assume(true) statements. [2023-03-31 20:51:16,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:51:16 BoogieIcfgContainer [2023-03-31 20:51:16,010 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 20:51:16,014 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 20:51:16,014 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 20:51:16,017 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 20:51:16,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 08:51:15" (1/3) ... [2023-03-31 20:51:16,018 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@345e2725 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:51:16, skipping insertion in model container [2023-03-31 20:51:16,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:51:15" (2/3) ... [2023-03-31 20:51:16,018 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@345e2725 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:51:16, skipping insertion in model container [2023-03-31 20:51:16,019 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:51:16" (3/3) ... [2023-03-31 20:51:16,020 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m2.c [2023-03-31 20:51:16,036 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 20:51:16,036 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 20:51:16,088 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 20:51:16,095 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;@74a750c1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 20:51:16,096 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 20:51:16,100 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 16 states have internal predecessors, (22), 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 20:51:16,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-03-31 20:51:16,108 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:16,109 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:16,110 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:16,117 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:16,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1774096933, now seen corresponding path program 1 times [2023-03-31 20:51:16,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:16,127 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300921385] [2023-03-31 20:51:16,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:16,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:16,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:16,409 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 20:51:16,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:16,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300921385] [2023-03-31 20:51:16,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300921385] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:51:16,411 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:51:16,411 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 20:51:16,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84843945] [2023-03-31 20:51:16,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:51:16,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 20:51:16,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:16,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 20:51:16,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 20:51:16,460 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 16 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:16,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:16,529 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-03-31 20:51:16,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 20:51:16,532 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-03-31 20:51:16,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:16,537 INFO L225 Difference]: With dead ends: 38 [2023-03-31 20:51:16,537 INFO L226 Difference]: Without dead ends: 17 [2023-03-31 20:51:16,540 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 20:51:16,543 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:16,544 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:16,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-03-31 20:51:16,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-03-31 20:51:16,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:16,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-03-31 20:51:16,616 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 15 [2023-03-31 20:51:16,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:16,616 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-03-31 20:51:16,616 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:16,617 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-03-31 20:51:16,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-03-31 20:51:16,617 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:16,617 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:16,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 20:51:16,618 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:16,619 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:16,619 INFO L85 PathProgramCache]: Analyzing trace with hash 468065968, now seen corresponding path program 1 times [2023-03-31 20:51:16,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:16,619 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140596843] [2023-03-31 20:51:16,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:16,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:16,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:16,797 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 20:51:16,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:16,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140596843] [2023-03-31 20:51:16,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140596843] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:51:16,797 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:51:16,798 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-03-31 20:51:16,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955604843] [2023-03-31 20:51:16,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:51:16,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-03-31 20:51:16,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:16,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-03-31 20:51:16,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-03-31 20:51:16,801 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:16,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:16,840 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2023-03-31 20:51:16,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 20:51:16,840 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2023-03-31 20:51:16,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:16,841 INFO L225 Difference]: With dead ends: 29 [2023-03-31 20:51:16,841 INFO L226 Difference]: Without dead ends: 21 [2023-03-31 20:51:16,842 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 20:51:16,843 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:16,844 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:16,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-03-31 20:51:16,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-03-31 20:51:16,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:16,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-03-31 20:51:16,850 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 16 [2023-03-31 20:51:16,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:16,851 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-03-31 20:51:16,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:16,851 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-03-31 20:51:16,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-03-31 20:51:16,852 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:16,852 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:16,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 20:51:16,852 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:16,853 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:16,853 INFO L85 PathProgramCache]: Analyzing trace with hash -158031230, now seen corresponding path program 1 times [2023-03-31 20:51:16,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:16,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338254845] [2023-03-31 20:51:16,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:16,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:16,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:17,018 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 20:51:17,018 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:17,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338254845] [2023-03-31 20:51:17,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338254845] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:17,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725461125] [2023-03-31 20:51:17,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:17,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:17,020 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:17,027 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 20:51:17,037 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 20:51:17,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:17,108 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:51:17,112 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:17,227 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 20:51:17,228 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:17,276 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 20:51:17,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725461125] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:17,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155688723] [2023-03-31 20:51:17,307 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:17,308 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:17,313 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:17,326 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:17,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:17,444 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:17,630 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:17,645 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:17,654 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:17,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '328#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:17,962 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:17,962 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:17,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-03-31 20:51:17,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555621668] [2023-03-31 20:51:17,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:17,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-03-31 20:51:17,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:17,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-03-31 20:51:17,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-03-31 20:51:17,968 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:18,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:18,011 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2023-03-31 20:51:18,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 20:51:18,011 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2023-03-31 20:51:18,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:18,013 INFO L225 Difference]: With dead ends: 35 [2023-03-31 20:51:18,014 INFO L226 Difference]: Without dead ends: 22 [2023-03-31 20:51:18,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2023-03-31 20:51:18,017 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:18,019 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:18,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-03-31 20:51:18,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-03-31 20:51:18,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:18,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-03-31 20:51:18,029 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2023-03-31 20:51:18,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:18,030 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-03-31 20:51:18,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:18,030 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-03-31 20:51:18,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-03-31 20:51:18,032 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:18,033 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:18,042 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 20:51:18,238 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 20:51:18,238 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:18,239 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:18,239 INFO L85 PathProgramCache]: Analyzing trace with hash 1484141783, now seen corresponding path program 2 times [2023-03-31 20:51:18,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:18,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244606356] [2023-03-31 20:51:18,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:18,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:18,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:18,323 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 20:51:18,323 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:18,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244606356] [2023-03-31 20:51:18,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244606356] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:18,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875715550] [2023-03-31 20:51:18,327 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:51:18,327 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:18,327 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:18,328 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 20:51:18,331 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 20:51:18,395 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-03-31 20:51:18,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:18,396 INFO L262 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:51:18,402 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:18,434 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 20:51:18,434 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:18,460 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 20:51:18,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875715550] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:18,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104840565] [2023-03-31 20:51:18,463 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:18,463 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:18,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:18,464 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:18,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:18,516 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:18,605 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:18,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:18,618 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:18,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '571#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:18,880 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:18,880 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:18,880 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-03-31 20:51:18,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99298516] [2023-03-31 20:51:18,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:18,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-03-31 20:51:18,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:18,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-03-31 20:51:18,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-03-31 20:51:18,882 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:18,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:18,921 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2023-03-31 20:51:18,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-03-31 20:51:18,922 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2023-03-31 20:51:18,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:18,922 INFO L225 Difference]: With dead ends: 37 [2023-03-31 20:51:18,923 INFO L226 Difference]: Without dead ends: 26 [2023-03-31 20:51:18,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2023-03-31 20:51:18,924 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 19 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:18,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 24 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:51:18,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-03-31 20:51:18,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-03-31 20:51:18,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:18,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2023-03-31 20:51:18,928 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 21 [2023-03-31 20:51:18,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:18,928 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2023-03-31 20:51:18,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:18,929 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2023-03-31 20:51:18,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-03-31 20:51:18,929 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:18,929 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:18,935 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 20:51:19,135 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 20:51:19,135 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:19,136 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:19,136 INFO L85 PathProgramCache]: Analyzing trace with hash 1221124997, now seen corresponding path program 3 times [2023-03-31 20:51:19,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:19,136 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804801175] [2023-03-31 20:51:19,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:19,136 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:19,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:20,400 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:20,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:20,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804801175] [2023-03-31 20:51:20,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804801175] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:20,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240744022] [2023-03-31 20:51:20,401 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:51:20,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:20,401 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:20,402 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 20:51:20,405 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 20:51:20,465 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:51:20,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:20,467 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 50 conjunts are in the unsatisfiable core [2023-03-31 20:51:20,470 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:20,935 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 20:51:20,935 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:21,442 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 20:51:21,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 43 [2023-03-31 20:51:21,657 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:21,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240744022] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:21,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1656149590] [2023-03-31 20:51:21,662 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:21,662 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:21,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:21,663 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:21,663 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:21,695 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:21,770 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:21,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:21,783 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:22,376 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '885#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:22,376 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:22,376 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:22,376 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 18] total 43 [2023-03-31 20:51:22,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601825800] [2023-03-31 20:51:22,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:22,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-03-31 20:51:22,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:22,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-03-31 20:51:22,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2023-03-31 20:51:22,379 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 43 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 41 states have internal predecessors, (53), 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 20:51:23,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:23,387 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2023-03-31 20:51:23,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-03-31 20:51:23,387 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 41 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-03-31 20:51:23,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:23,388 INFO L225 Difference]: With dead ends: 41 [2023-03-31 20:51:23,388 INFO L226 Difference]: Without dead ends: 36 [2023-03-31 20:51:23,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 990 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=333, Invalid=4223, Unknown=0, NotChecked=0, Total=4556 [2023-03-31 20:51:23,390 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:23,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 144 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 582 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 20:51:23,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-03-31 20:51:23,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2023-03-31 20:51:23,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:23,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2023-03-31 20:51:23,404 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2023-03-31 20:51:23,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:23,405 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2023-03-31 20:51:23,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 41 states have internal predecessors, (53), 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 20:51:23,405 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2023-03-31 20:51:23,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-03-31 20:51:23,406 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:23,406 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:23,415 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 20:51:23,615 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 20:51:23,616 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:23,616 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:23,616 INFO L85 PathProgramCache]: Analyzing trace with hash -1814212233, now seen corresponding path program 4 times [2023-03-31 20:51:23,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:23,616 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773397724] [2023-03-31 20:51:23,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:23,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:23,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:23,718 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-03-31 20:51:23,718 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:23,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773397724] [2023-03-31 20:51:23,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773397724] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:23,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331285451] [2023-03-31 20:51:23,719 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:51:23,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:23,719 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:23,720 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 20:51:23,744 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 20:51:23,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:23,781 INFO L262 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 20:51:23,782 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:23,829 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-03-31 20:51:23,829 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:23,874 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-03-31 20:51:23,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331285451] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:23,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [714976668] [2023-03-31 20:51:23,877 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:23,877 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:23,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:23,879 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:23,880 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:23,909 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:24,005 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:24,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:24,018 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:24,285 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1227#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:24,286 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:24,286 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:24,286 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-03-31 20:51:24,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104331278] [2023-03-31 20:51:24,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:24,286 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-03-31 20:51:24,287 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:24,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-03-31 20:51:24,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2023-03-31 20:51:24,288 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:24,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:24,416 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2023-03-31 20:51:24,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-03-31 20:51:24,416 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2023-03-31 20:51:24,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:24,418 INFO L225 Difference]: With dead ends: 66 [2023-03-31 20:51:24,418 INFO L226 Difference]: Without dead ends: 39 [2023-03-31 20:51:24,419 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=598, Unknown=0, NotChecked=0, Total=702 [2023-03-31 20:51:24,421 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 4 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:24,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 37 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:24,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-03-31 20:51:24,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2023-03-31 20:51:24,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:24,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2023-03-31 20:51:24,428 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 26 [2023-03-31 20:51:24,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:24,428 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2023-03-31 20:51:24,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:24,428 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2023-03-31 20:51:24,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-03-31 20:51:24,429 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:24,429 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:24,444 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 20:51:24,643 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 20:51:24,644 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:24,644 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:24,644 INFO L85 PathProgramCache]: Analyzing trace with hash 658182156, now seen corresponding path program 5 times [2023-03-31 20:51:24,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:24,644 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87100901] [2023-03-31 20:51:24,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:24,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:24,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:24,735 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-03-31 20:51:24,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:24,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87100901] [2023-03-31 20:51:24,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87100901] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:24,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [229197240] [2023-03-31 20:51:24,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:51:24,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:24,736 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:24,737 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 20:51:24,739 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 20:51:24,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 20:51:24,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:24,799 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 20:51:24,801 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:24,859 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-03-31 20:51:24,859 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:24,920 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-03-31 20:51:24,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [229197240] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:24,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1860800031] [2023-03-31 20:51:24,922 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:24,922 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:24,923 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:24,923 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:24,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:24,945 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:25,002 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:25,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:25,011 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:25,249 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1608#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:25,249 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:25,249 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:25,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-03-31 20:51:25,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329238965] [2023-03-31 20:51:25,250 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:25,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-03-31 20:51:25,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:25,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-03-31 20:51:25,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2023-03-31 20:51:25,251 INFO L87 Difference]: Start difference. First operand 36 states and 42 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 20:51:25,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:25,400 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2023-03-31 20:51:25,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-03-31 20:51:25,400 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 27 [2023-03-31 20:51:25,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:25,401 INFO L225 Difference]: With dead ends: 42 [2023-03-31 20:51:25,401 INFO L226 Difference]: Without dead ends: 31 [2023-03-31 20:51:25,401 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2023-03-31 20:51:25,402 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:25,402 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 56 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:25,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-03-31 20:51:25,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-03-31 20:51:25,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:25,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-03-31 20:51:25,408 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 27 [2023-03-31 20:51:25,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:25,409 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-03-31 20:51:25,409 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 20:51:25,409 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-03-31 20:51:25,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-03-31 20:51:25,409 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:25,410 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:25,417 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 20:51:25,617 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 20:51:25,617 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:25,618 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:25,618 INFO L85 PathProgramCache]: Analyzing trace with hash 1553220770, now seen corresponding path program 6 times [2023-03-31 20:51:25,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:25,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898495338] [2023-03-31 20:51:25,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:25,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:25,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:27,299 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:27,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:27,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898495338] [2023-03-31 20:51:27,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898495338] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:27,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311381144] [2023-03-31 20:51:27,300 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:51:27,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:27,300 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:27,304 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 20:51:27,309 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 20:51:27,373 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:51:27,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:27,375 INFO L262 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 64 conjunts are in the unsatisfiable core [2023-03-31 20:51:27,377 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:28,100 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 20:51:28,100 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:28,880 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 20:51:28,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 89 [2023-03-31 20:51:29,170 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 20:51:29,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311381144] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:29,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [19411967] [2023-03-31 20:51:29,172 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:29,172 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:29,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:29,173 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:29,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:29,194 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:29,279 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:29,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:29,290 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:29,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1996#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:29,917 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:29,917 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:29,917 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 21, 21] total 57 [2023-03-31 20:51:29,917 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652680278] [2023-03-31 20:51:29,917 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:29,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2023-03-31 20:51:29,918 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:29,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2023-03-31 20:51:29,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=4306, Unknown=0, NotChecked=0, Total=4556 [2023-03-31 20:51:29,922 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 57 states, 57 states have (on average 1.1578947368421053) internal successors, (66), 55 states have internal predecessors, (66), 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 20:51:31,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:31,897 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2023-03-31 20:51:31,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-03-31 20:51:31,898 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.1578947368421053) internal successors, (66), 55 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2023-03-31 20:51:31,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:31,898 INFO L225 Difference]: With dead ends: 53 [2023-03-31 20:51:31,899 INFO L226 Difference]: Without dead ends: 48 [2023-03-31 20:51:31,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1671 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=453, Invalid=7203, Unknown=0, NotChecked=0, Total=7656 [2023-03-31 20:51:31,901 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 5 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 985 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 1042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 985 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:31,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 168 Invalid, 1042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 985 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-03-31 20:51:31,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-03-31 20:51:31,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2023-03-31 20:51:31,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 36 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:31,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2023-03-31 20:51:31,909 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 30 [2023-03-31 20:51:31,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:31,910 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2023-03-31 20:51:31,910 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.1578947368421053) internal successors, (66), 55 states have internal predecessors, (66), 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 20:51:31,910 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2023-03-31 20:51:31,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-03-31 20:51:31,910 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:31,910 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:31,916 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 20:51:32,113 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 20:51:32,113 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:32,114 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:32,114 INFO L85 PathProgramCache]: Analyzing trace with hash -78014370, now seen corresponding path program 7 times [2023-03-31 20:51:32,114 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:32,114 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123503024] [2023-03-31 20:51:32,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:32,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:32,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:32,216 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-03-31 20:51:32,216 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:32,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123503024] [2023-03-31 20:51:32,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123503024] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:32,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897786808] [2023-03-31 20:51:32,217 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:51:32,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:32,217 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:32,218 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 20:51:32,221 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 20:51:32,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:32,281 INFO L262 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 20:51:32,283 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:32,353 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-03-31 20:51:32,353 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:32,402 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-03-31 20:51:32,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897786808] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:32,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [854099465] [2023-03-31 20:51:32,404 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:32,404 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:32,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:32,405 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:32,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:32,425 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:32,494 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:32,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:32,503 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:32,754 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2421#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:32,754 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:32,754 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:32,754 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2023-03-31 20:51:32,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283904298] [2023-03-31 20:51:32,755 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:32,755 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-03-31 20:51:32,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:32,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-03-31 20:51:32,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2023-03-31 20:51:32,756 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:32,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:32,895 INFO L93 Difference]: Finished difference Result 80 states and 97 transitions. [2023-03-31 20:51:32,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 20:51:32,896 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2023-03-31 20:51:32,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:32,896 INFO L225 Difference]: With dead ends: 80 [2023-03-31 20:51:32,896 INFO L226 Difference]: Without dead ends: 46 [2023-03-31 20:51:32,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 71 SyntacticMatches, 6 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=140, Invalid=790, Unknown=0, NotChecked=0, Total=930 [2023-03-31 20:51:32,897 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 7 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:32,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 35 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:32,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-03-31 20:51:32,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2023-03-31 20:51:32,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:32,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2023-03-31 20:51:32,906 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 31 [2023-03-31 20:51:32,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:32,907 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2023-03-31 20:51:32,907 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:32,907 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2023-03-31 20:51:32,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-03-31 20:51:32,908 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:32,908 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:32,913 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 20:51:33,113 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 20:51:33,113 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:33,114 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:33,114 INFO L85 PathProgramCache]: Analyzing trace with hash 824487657, now seen corresponding path program 8 times [2023-03-31 20:51:33,114 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:33,114 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113970863] [2023-03-31 20:51:33,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:33,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:33,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:33,242 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-03-31 20:51:33,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:33,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113970863] [2023-03-31 20:51:33,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113970863] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:33,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254929210] [2023-03-31 20:51:33,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:51:33,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:33,243 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:33,244 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 20:51:33,246 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 20:51:33,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 20:51:33,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:33,313 INFO L262 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 20:51:33,314 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:33,377 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-03-31 20:51:33,378 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:33,434 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-03-31 20:51:33,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254929210] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:33,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [458088975] [2023-03-31 20:51:33,436 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:33,436 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:33,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:33,437 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:33,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:33,456 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:33,501 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:33,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:33,509 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:33,755 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2879#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:33,756 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:33,756 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:33,756 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-03-31 20:51:33,756 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845932122] [2023-03-31 20:51:33,756 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:33,757 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-03-31 20:51:33,757 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:33,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-03-31 20:51:33,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2023-03-31 20:51:33,758 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:33,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:33,896 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2023-03-31 20:51:33,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 20:51:33,896 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2023-03-31 20:51:33,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:33,897 INFO L225 Difference]: With dead ends: 49 [2023-03-31 20:51:33,897 INFO L226 Difference]: Without dead ends: 36 [2023-03-31 20:51:33,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 72 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=162, Invalid=960, Unknown=0, NotChecked=0, Total=1122 [2023-03-31 20:51:33,898 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:33,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 48 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:33,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-03-31 20:51:33,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-03-31 20:51:33,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 31 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:33,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2023-03-31 20:51:33,906 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 32 [2023-03-31 20:51:33,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:33,906 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2023-03-31 20:51:33,906 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:33,906 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2023-03-31 20:51:33,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-03-31 20:51:33,907 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:33,907 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:33,912 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 20:51:34,112 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 20:51:34,112 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:34,113 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:34,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1502964965, now seen corresponding path program 9 times [2023-03-31 20:51:34,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:34,113 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508445034] [2023-03-31 20:51:34,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:34,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:34,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:36,578 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:36,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:36,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508445034] [2023-03-31 20:51:36,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508445034] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:36,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295103285] [2023-03-31 20:51:36,579 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:51:36,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:36,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:36,580 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 20:51:36,582 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 20:51:36,661 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:51:36,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:36,663 INFO L262 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 85 conjunts are in the unsatisfiable core [2023-03-31 20:51:36,665 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:36,710 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 20:51:37,519 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 20:51:37,519 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:38,945 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 20:51:38,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295103285] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:38,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155010729] [2023-03-31 20:51:38,948 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:38,948 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:38,949 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:38,949 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:38,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:38,976 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:39,042 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:39,045 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:39,049 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:39,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3337#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:39,760 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:39,760 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:39,760 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 26] total 71 [2023-03-31 20:51:39,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239282579] [2023-03-31 20:51:39,760 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:39,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2023-03-31 20:51:39,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:39,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2023-03-31 20:51:39,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=6309, Unknown=0, NotChecked=0, Total=6642 [2023-03-31 20:51:39,763 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 71 states, 71 states have (on average 1.1267605633802817) internal successors, (80), 69 states have internal predecessors, (80), 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 20:51:45,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:45,426 INFO L93 Difference]: Finished difference Result 82 states and 95 transitions. [2023-03-31 20:51:45,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2023-03-31 20:51:45,427 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.1267605633802817) internal successors, (80), 69 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2023-03-31 20:51:45,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:45,427 INFO L225 Difference]: With dead ends: 82 [2023-03-31 20:51:45,427 INFO L226 Difference]: Without dead ends: 76 [2023-03-31 20:51:45,430 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3411 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=1009, Invalid=13753, Unknown=0, NotChecked=0, Total=14762 [2023-03-31 20:51:45,431 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 23 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 2151 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 2361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 2151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:45,431 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 309 Invalid, 2361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 2151 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-03-31 20:51:45,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-03-31 20:51:45,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 43. [2023-03-31 20:51:45,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:45,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2023-03-31 20:51:45,449 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 35 [2023-03-31 20:51:45,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:45,449 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2023-03-31 20:51:45,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.1267605633802817) internal successors, (80), 69 states have internal predecessors, (80), 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 20:51:45,449 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2023-03-31 20:51:45,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-03-31 20:51:45,450 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:45,450 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:45,456 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 20:51:45,656 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 20:51:45,656 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:45,657 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:45,657 INFO L85 PathProgramCache]: Analyzing trace with hash -2078284247, now seen corresponding path program 10 times [2023-03-31 20:51:45,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:45,657 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996637782] [2023-03-31 20:51:45,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:45,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:45,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:45,799 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-03-31 20:51:45,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:45,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996637782] [2023-03-31 20:51:45,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996637782] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:45,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886664081] [2023-03-31 20:51:45,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:51:45,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:45,800 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:45,801 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 20:51:45,830 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 20:51:45,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:45,876 INFO L262 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 20:51:45,879 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:45,970 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-03-31 20:51:45,970 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:46,057 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-03-31 20:51:46,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886664081] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:46,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [560746047] [2023-03-31 20:51:46,060 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:46,060 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:46,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:46,060 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:46,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:46,081 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:46,136 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:46,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:46,145 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:46,463 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3895#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:46,463 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:46,463 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:46,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-03-31 20:51:46,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705450139] [2023-03-31 20:51:46,463 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:46,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-03-31 20:51:46,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:46,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-03-31 20:51:46,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=791, Unknown=0, NotChecked=0, Total=930 [2023-03-31 20:51:46,467 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:46,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:46,691 INFO L93 Difference]: Finished difference Result 100 states and 117 transitions. [2023-03-31 20:51:46,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-03-31 20:51:46,691 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2023-03-31 20:51:46,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:46,692 INFO L225 Difference]: With dead ends: 100 [2023-03-31 20:51:46,692 INFO L226 Difference]: Without dead ends: 52 [2023-03-31 20:51:46,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 82 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 479 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=199, Invalid=1061, Unknown=0, NotChecked=0, Total=1260 [2023-03-31 20:51:46,693 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:46,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 49 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:46,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-03-31 20:51:46,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2023-03-31 20:51:46,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.15) internal successors, (46), 40 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:46,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2023-03-31 20:51:46,723 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 36 [2023-03-31 20:51:46,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:46,723 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2023-03-31 20:51:46,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:46,724 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2023-03-31 20:51:46,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-03-31 20:51:46,729 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:46,729 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:46,737 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 20:51:46,934 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 20:51:46,935 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:46,935 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:46,935 INFO L85 PathProgramCache]: Analyzing trace with hash -1038632574, now seen corresponding path program 11 times [2023-03-31 20:51:46,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:46,935 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131857341] [2023-03-31 20:51:46,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:46,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:46,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:47,077 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-03-31 20:51:47,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:47,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131857341] [2023-03-31 20:51:47,078 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1131857341] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:47,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2147312012] [2023-03-31 20:51:47,078 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:51:47,078 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:47,078 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:47,079 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 20:51:47,082 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 20:51:47,166 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-03-31 20:51:47,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:47,168 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 20:51:47,169 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:47,253 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-03-31 20:51:47,254 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:47,335 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-03-31 20:51:47,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2147312012] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:47,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [584566023] [2023-03-31 20:51:47,337 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:47,337 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:47,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:47,337 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:47,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:47,361 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:47,416 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:47,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:47,424 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:47,685 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4435#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:47,686 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:47,686 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:47,686 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-03-31 20:51:47,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42524760] [2023-03-31 20:51:47,686 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:47,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-03-31 20:51:47,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:47,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-03-31 20:51:47,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2023-03-31 20:51:47,687 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:47,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:47,869 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2023-03-31 20:51:47,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-03-31 20:51:47,869 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2023-03-31 20:51:47,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:47,870 INFO L225 Difference]: With dead ends: 51 [2023-03-31 20:51:47,870 INFO L226 Difference]: Without dead ends: 41 [2023-03-31 20:51:47,871 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 92 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=206, Invalid=1200, Unknown=0, NotChecked=0, Total=1406 [2023-03-31 20:51:47,871 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:47,871 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 26 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:51:47,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-03-31 20:51:47,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-03-31 20:51:47,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:47,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2023-03-31 20:51:47,884 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 38 [2023-03-31 20:51:47,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:47,884 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2023-03-31 20:51:47,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:47,884 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2023-03-31 20:51:47,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-03-31 20:51:47,884 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:47,885 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:47,894 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 20:51:48,086 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 20:51:48,086 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:48,087 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:48,087 INFO L85 PathProgramCache]: Analyzing trace with hash 782593730, now seen corresponding path program 12 times [2023-03-31 20:51:48,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:48,087 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559059471] [2023-03-31 20:51:48,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:48,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:48,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:51,151 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 1 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:51:51,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:51,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559059471] [2023-03-31 20:51:51,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559059471] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:51,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729795120] [2023-03-31 20:51:51,152 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:51:51,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:51,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:51,157 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 20:51:51,160 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 20:51:51,231 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:51:51,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:51:51,233 INFO L262 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 98 conjunts are in the unsatisfiable core [2023-03-31 20:51:51,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:51,293 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 20:51:52,416 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 5 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-03-31 20:51:52,416 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:54,279 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-03-31 20:51:54,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729795120] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:54,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [780658046] [2023-03-31 20:51:54,280 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:54,280 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:54,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:54,281 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:54,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:54,310 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:54,370 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:54,373 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:54,377 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:55,148 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4956#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:55,148 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:55,148 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:55,148 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 29, 29] total 83 [2023-03-31 20:51:55,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660848115] [2023-03-31 20:51:55,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:55,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2023-03-31 20:51:55,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:55,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2023-03-31 20:51:55,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=8372, Unknown=0, NotChecked=0, Total=8742 [2023-03-31 20:51:55,151 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 83 states, 83 states have (on average 1.108433734939759) internal successors, (92), 81 states have internal predecessors, (92), 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 20:51:58,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:51:58,958 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2023-03-31 20:51:58,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-03-31 20:51:58,959 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.108433734939759) internal successors, (92), 81 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2023-03-31 20:51:58,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:51:58,959 INFO L225 Difference]: With dead ends: 69 [2023-03-31 20:51:58,960 INFO L226 Difference]: Without dead ends: 64 [2023-03-31 20:51:58,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3466 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=719, Invalid=14043, Unknown=0, NotChecked=0, Total=14762 [2023-03-31 20:51:58,961 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 5 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 2136 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 2218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 2136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:51:58,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 306 Invalid, 2218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 2136 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-03-31 20:51:58,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-03-31 20:51:58,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 55. [2023-03-31 20:51:58,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.16) internal successors, (58), 50 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:51:58,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2023-03-31 20:51:58,985 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 40 [2023-03-31 20:51:58,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:51:58,985 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2023-03-31 20:51:58,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.108433734939759) internal successors, (92), 81 states have internal predecessors, (92), 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 20:51:58,985 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2023-03-31 20:51:58,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-03-31 20:51:58,986 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:51:58,986 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:51:58,992 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 20:51:59,197 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 20:51:59,198 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:51:59,198 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:51:59,198 INFO L85 PathProgramCache]: Analyzing trace with hash -605825730, now seen corresponding path program 13 times [2023-03-31 20:51:59,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:51:59,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206921908] [2023-03-31 20:51:59,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:51:59,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:51:59,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:59,340 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-03-31 20:51:59,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:51:59,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206921908] [2023-03-31 20:51:59,341 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206921908] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:51:59,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235900067] [2023-03-31 20:51:59,341 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:51:59,341 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:51:59,341 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:51:59,343 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 20:51:59,345 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 20:51:59,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:51:59,408 INFO L262 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2023-03-31 20:51:59,410 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:51:59,503 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-03-31 20:51:59,503 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:51:59,571 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-03-31 20:51:59,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235900067] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:51:59,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [77922984] [2023-03-31 20:51:59,572 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:51:59,573 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:51:59,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:51:59,573 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:51:59,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:51:59,593 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:51:59,645 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:51:59,649 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:51:59,653 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:51:59,921 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5523#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:51:59,921 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:51:59,921 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:51:59,921 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2023-03-31 20:51:59,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208706503] [2023-03-31 20:51:59,921 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:51:59,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-03-31 20:51:59,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:51:59,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-03-31 20:51:59,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=898, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 20:51:59,923 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:00,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:00,136 INFO L93 Difference]: Finished difference Result 108 states and 125 transitions. [2023-03-31 20:52:00,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-03-31 20:52:00,136 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2023-03-31 20:52:00,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:00,137 INFO L225 Difference]: With dead ends: 108 [2023-03-31 20:52:00,137 INFO L226 Difference]: Without dead ends: 60 [2023-03-31 20:52:00,138 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 95 SyntacticMatches, 10 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 546 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2023-03-31 20:52:00,138 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:00,138 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 49 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:52:00,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-03-31 20:52:00,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2023-03-31 20:52:00,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 52 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:00,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2023-03-31 20:52:00,155 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 41 [2023-03-31 20:52:00,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:00,156 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2023-03-31 20:52:00,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:00,156 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2023-03-31 20:52:00,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-03-31 20:52:00,156 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:00,156 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:00,165 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-03-31 20:52:00,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-03-31 20:52:00,362 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:00,362 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:00,362 INFO L85 PathProgramCache]: Analyzing trace with hash 259553801, now seen corresponding path program 14 times [2023-03-31 20:52:00,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:00,362 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740979122] [2023-03-31 20:52:00,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:00,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:00,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:00,527 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-03-31 20:52:00,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:00,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740979122] [2023-03-31 20:52:00,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740979122] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:52:00,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831905850] [2023-03-31 20:52:00,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:52:00,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:00,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:00,529 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:00,556 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-03-31 20:52:00,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-03-31 20:52:00,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:52:00,624 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 14 conjunts are in the unsatisfiable core [2023-03-31 20:52:00,625 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:00,722 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-03-31 20:52:00,722 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:00,828 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-03-31 20:52:00,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831905850] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:00,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1191714174] [2023-03-31 20:52:00,829 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 20:52:00,829 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:00,829 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:00,830 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:00,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:00,844 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs [2023-03-31 20:52:00,896 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-03-31 20:52:00,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-03-31 20:52:00,905 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:01,170 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6135#(and (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 100000) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 20:52:01,171 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:01,171 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 20:52:01,171 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-03-31 20:52:01,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9975717] [2023-03-31 20:52:01,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:01,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-03-31 20:52:01,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:01,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-03-31 20:52:01,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=957, Unknown=0, NotChecked=0, Total=1122 [2023-03-31 20:52:01,172 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:01,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:01,372 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2023-03-31 20:52:01,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-03-31 20:52:01,372 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2023-03-31 20:52:01,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:01,373 INFO L225 Difference]: With dead ends: 63 [2023-03-31 20:52:01,373 INFO L226 Difference]: Without dead ends: 46 [2023-03-31 20:52:01,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 96 SyntacticMatches, 12 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 716 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=257, Invalid=1465, Unknown=0, NotChecked=0, Total=1722 [2023-03-31 20:52:01,374 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 8 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:01,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 63 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:52:01,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-03-31 20:52:01,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-03-31 20:52:01,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:01,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2023-03-31 20:52:01,387 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 42 [2023-03-31 20:52:01,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:01,388 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2023-03-31 20:52:01,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:01,388 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2023-03-31 20:52:01,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-03-31 20:52:01,388 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:01,388 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:01,393 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:01,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:01,589 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:01,589 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:01,589 INFO L85 PathProgramCache]: Analyzing trace with hash 314453573, now seen corresponding path program 15 times [2023-03-31 20:52:01,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:01,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52254111] [2023-03-31 20:52:01,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:01,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:01,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:05,045 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:05,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:05,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52254111] [2023-03-31 20:52:05,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52254111] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 20:52:05,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256505939] [2023-03-31 20:52:05,046 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:52:05,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:05,046 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:05,053 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:05,056 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-03-31 20:52:05,145 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:52:05,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:52:05,147 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 112 conjunts are in the unsatisfiable core [2023-03-31 20:52:05,150 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:06,549 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 6 proven. 84 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 20:52:06,549 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:08,865 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 20:52:08,865 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 336