/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain EqDomain -i ../sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:06:29,627 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:06:29,629 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:06:29,665 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:06:29,665 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:06:29,668 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:06:29,671 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:06:29,673 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:06:29,674 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:06:29,679 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:06:29,681 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:06:29,682 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:06:29,682 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:06:29,685 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:06:29,686 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:06:29,687 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:06:29,687 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:06:29,688 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:06:29,690 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:06:29,694 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:06:29,695 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:06:29,696 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:06:29,697 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:06:29,698 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:06:29,705 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 11:06:29,706 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 11:06:29,706 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 11:06:29,707 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 11:06:29,708 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 11:06:29,708 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 11:06:29,709 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:06:29,710 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:06:29,711 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:06:29,711 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:06:29,712 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:06:29,712 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:06:29,713 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:06:29,713 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:06:29,713 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:06:29,714 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:06:29,714 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:06:29,715 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 11:06:29,737 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:06:29,737 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:06:29,738 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:06:29,738 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:06:29,738 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:06:29,738 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:06:29,739 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:06:29,739 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:06:29,739 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:06:29,739 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:06:29,739 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:06:29,739 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:06:29,739 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:06:29,739 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:06:29,740 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:06:29,740 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:06:29,740 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:06:29,740 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:06:29,740 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:06:29,741 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:06:29,742 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:06:29,742 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:06:29,742 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:06:29,742 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:06:29,742 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:06:29,742 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:06:29,742 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:06:29,742 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:06:29,743 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:06:29,743 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:06:29,743 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:06:29,743 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:06:29,743 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:06:29,743 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:06:29,973 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:06:30,000 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:06:30,003 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:06:30,005 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:06:30,006 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:06:30,007 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c [2023-04-01 11:06:31,282 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:06:31,488 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:06:31,488 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c [2023-04-01 11:06:31,495 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a259b466/505deb1191214aee949f37df50344d3e/FLAG5365c27a8 [2023-04-01 11:06:31,511 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a259b466/505deb1191214aee949f37df50344d3e [2023-04-01 11:06:31,513 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:06:31,514 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:06:31,518 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:06:31,519 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:06:31,522 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:06:31,522 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,523 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6949c45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31, skipping insertion in model container [2023-04-01 11:06:31,524 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,530 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:06:31,548 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:06:31,673 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c[1613,1626] [2023-04-01 11:06:31,684 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:06:31,702 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:06:31,720 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c[1613,1626] [2023-04-01 11:06:31,730 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:06:31,742 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:06:31,742 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31 WrapperNode [2023-04-01 11:06:31,742 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:06:31,743 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:06:31,744 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:06:31,744 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:06:31,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,762 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,763 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,772 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,776 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,777 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,778 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,780 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:06:31,780 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:06:31,781 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:06:31,781 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:06:31,782 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (1/1) ... [2023-04-01 11:06:31,788 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:06:31,797 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:31,811 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 11:06:31,820 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 11:06:31,840 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:06:31,841 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:06:31,841 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:06:31,841 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 11:06:31,842 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:06:31,842 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:06:31,842 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:06:31,842 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:06:31,842 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:06:31,843 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 11:06:31,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 11:06:31,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 11:06:31,843 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:06:31,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:06:31,843 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:06:31,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:06:31,844 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:06:31,844 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:06:31,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:06:31,897 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:06:31,898 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:06:32,122 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:06:32,236 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:06:32,236 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-04-01 11:06:32,238 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:06:32 BoogieIcfgContainer [2023-04-01 11:06:32,239 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:06:32,240 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:06:32,241 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:06:32,243 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:06:32,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:06:31" (1/3) ... [2023-04-01 11:06:32,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a1624d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:06:32, skipping insertion in model container [2023-04-01 11:06:32,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:06:31" (2/3) ... [2023-04-01 11:06:32,245 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a1624d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:06:32, skipping insertion in model container [2023-04-01 11:06:32,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:06:32" (3/3) ... [2023-04-01 11:06:32,246 INFO L112 eAbstractionObserver]: Analyzing ICFG gj2007.c.i.p+lhb-reducer.c [2023-04-01 11:06:32,262 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:06:32,262 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:06:32,300 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:06:32,305 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;@75ff8301, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:06:32,306 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:06:32,309 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 11:06:32,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-04-01 11:06:32,316 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:32,317 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:32,317 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:32,322 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:32,322 INFO L85 PathProgramCache]: Analyzing trace with hash -164184841, now seen corresponding path program 1 times [2023-04-01 11:06:32,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:32,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252329466] [2023-04-01 11:06:32,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:32,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:32,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:33,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:33,027 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:33,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252329466] [2023-04-01 11:06:33,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252329466] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:06:33,028 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:06:33,029 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2023-04-01 11:06:33,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035701104] [2023-04-01 11:06:33,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:06:33,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-01 11:06:33,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:06:33,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-01 11:06:33,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2023-04-01 11:06:33,065 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:33,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:06:33,125 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-04-01 11:06:33,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 11:06:33,127 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2023-04-01 11:06:33,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:06:33,133 INFO L225 Difference]: With dead ends: 30 [2023-04-01 11:06:33,133 INFO L226 Difference]: Without dead ends: 19 [2023-04-01 11:06:33,138 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2023-04-01 11:06:33,143 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:06:33,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 47 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:06:33,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-04-01 11:06:33,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-04-01 11:06:33,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:33,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2023-04-01 11:06:33,178 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2023-04-01 11:06:33,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:06:33,178 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2023-04-01 11:06:33,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:33,178 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2023-04-01 11:06:33,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-04-01 11:06:33,179 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:33,179 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:33,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 11:06:33,179 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:33,180 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:33,180 INFO L85 PathProgramCache]: Analyzing trace with hash -793097305, now seen corresponding path program 1 times [2023-04-01 11:06:33,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:33,180 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916255820] [2023-04-01 11:06:33,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:33,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:33,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:33,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:33,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:33,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916255820] [2023-04-01 11:06:33,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916255820] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:33,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1179054302] [2023-04-01 11:06:33,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:33,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:33,505 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:33,508 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:06:33,518 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 11:06:33,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:33,590 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 11:06:33,597 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:06:33,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:33,703 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:06:34,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:34,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1179054302] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:06:34,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1368113952] [2023-04-01 11:06:34,279 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 11:06:34,279 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:06:34,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:06:34,288 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:06:34,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:06:34,461 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:06:34,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:06:34,816 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:06:35,984 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '244#(and (= ~__return_720~0 0) (= (select |#length| 3) 12) (<= 100 main_~main__x~0) (not (= 100 main_~main__y~0)) (= |old(~__return_720~0)| 0) (= 2 (select |#length| 1)) (= main_~__VERIFIER_assert__cond~0 0) (= (select |#valid| 3) 1) (not (= |#StackHeapBarrier| 0)) (= main_~__tmp_1~0 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= 27 (select |#length| 2)) (= (select (select |#memory_int| 1) 1) 0) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:06:35,985 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:06:35,985 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:06:35,985 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-01 11:06:35,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666862818] [2023-04-01 11:06:35,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:06:35,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-01 11:06:35,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:06:35,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-01 11:06:35,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=1042, Unknown=0, NotChecked=0, Total=1560 [2023-04-01 11:06:35,989 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 25 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:36,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:06:36,045 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2023-04-01 11:06:36,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-01 11:06:36,045 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-04-01 11:06:36,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:06:36,046 INFO L225 Difference]: With dead ends: 34 [2023-04-01 11:06:36,046 INFO L226 Difference]: Without dead ends: 31 [2023-04-01 11:06:36,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=518, Invalid=1042, Unknown=0, NotChecked=0, Total=1560 [2023-04-01 11:06:36,048 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:06:36,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:06:36,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-04-01 11:06:36,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-04-01 11:06:36,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:36,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2023-04-01 11:06:36,054 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 18 [2023-04-01 11:06:36,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:06:36,054 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2023-04-01 11:06:36,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:36,054 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2023-04-01 11:06:36,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 11:06:36,055 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:36,055 INFO L195 NwaCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:36,067 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 11:06:36,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:36,261 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:36,262 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:36,262 INFO L85 PathProgramCache]: Analyzing trace with hash 1700415399, now seen corresponding path program 2 times [2023-04-01 11:06:36,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:36,265 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311140735] [2023-04-01 11:06:36,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:36,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:36,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:37,123 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:37,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:37,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311140735] [2023-04-01 11:06:37,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311140735] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:37,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833051720] [2023-04-01 11:06:37,124 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 11:06:37,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:37,124 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:37,125 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:06:37,136 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 11:06:37,189 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-04-01 11:06:37,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:06:37,190 INFO L262 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-01 11:06:37,193 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:06:37,253 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:37,253 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:06:38,120 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:38,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833051720] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:06:38,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2069294257] [2023-04-01 11:06:38,122 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 11:06:38,122 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:06:38,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:06:38,123 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:06:38,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:06:38,164 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:06:38,349 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:06:38,354 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:06:39,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '602#(and (= ~__return_720~0 0) (= (select |#length| 3) 12) (<= 100 main_~main__x~0) (not (= 100 main_~main__y~0)) (= |old(~__return_720~0)| 0) (= 2 (select |#length| 1)) (= main_~__VERIFIER_assert__cond~0 0) (= (select |#valid| 3) 1) (not (= |#StackHeapBarrier| 0)) (= main_~__tmp_1~0 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= 27 (select |#length| 2)) (= (select (select |#memory_int| 1) 1) 0) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:06:39,442 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:06:39,442 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:06:39,442 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-04-01 11:06:39,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800559645] [2023-04-01 11:06:39,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:06:39,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-01 11:06:39,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:06:39,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-01 11:06:39,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1610, Invalid=2422, Unknown=0, NotChecked=0, Total=4032 [2023-04-01 11:06:39,447 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 49 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 49 states have internal predecessors, (53), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:39,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:06:39,528 INFO L93 Difference]: Finished difference Result 58 states and 81 transitions. [2023-04-01 11:06:39,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-01 11:06:39,529 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 49 states have internal predecessors, (53), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2023-04-01 11:06:39,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:06:39,530 INFO L225 Difference]: With dead ends: 58 [2023-04-01 11:06:39,530 INFO L226 Difference]: Without dead ends: 55 [2023-04-01 11:06:39,531 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1358 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1610, Invalid=2422, Unknown=0, NotChecked=0, Total=4032 [2023-04-01 11:06:39,532 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:06:39,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:06:39,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-04-01 11:06:39,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-04-01 11:06:39,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 51 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:39,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2023-04-01 11:06:39,548 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 30 [2023-04-01 11:06:39,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:06:39,549 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2023-04-01 11:06:39,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 49 states have internal predecessors, (53), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:39,549 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2023-04-01 11:06:39,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-01 11:06:39,550 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:39,550 INFO L195 NwaCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:39,559 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 11:06:39,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 11:06:39,757 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:39,757 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:39,757 INFO L85 PathProgramCache]: Analyzing trace with hash -246661209, now seen corresponding path program 3 times [2023-04-01 11:06:39,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:39,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959268020] [2023-04-01 11:06:39,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:39,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:39,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:42,368 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:42,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:42,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959268020] [2023-04-01 11:06:42,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959268020] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:42,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987167673] [2023-04-01 11:06:42,369 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 11:06:42,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:42,370 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:42,371 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:06:42,373 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 11:06:42,431 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 11:06:42,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 11:06:42,432 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-01 11:06:42,436 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:06:42,546 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:42,546 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:06:45,484 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:45,484 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987167673] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:06:45,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [93031396] [2023-04-01 11:06:45,486 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 11:06:45,486 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:06:45,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:06:45,487 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:06:45,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:06:45,543 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:06:45,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:06:45,710 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:06:46,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1248#(and (= ~__return_720~0 0) (= (select |#length| 3) 12) (<= 100 main_~main__x~0) (not (= 100 main_~main__y~0)) (= |old(~__return_720~0)| 0) (= 2 (select |#length| 1)) (= main_~__VERIFIER_assert__cond~0 0) (= (select |#valid| 3) 1) (not (= |#StackHeapBarrier| 0)) (= main_~__tmp_1~0 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= 27 (select |#length| 2)) (= (select (select |#memory_int| 1) 1) 0) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:06:46,770 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:06:46,770 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:06:46,770 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2023-04-01 11:06:46,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135296901] [2023-04-01 11:06:46,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:06:46,774 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-04-01 11:06:46,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:06:46,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-04-01 11:06:46,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5522, Invalid=6910, Unknown=0, NotChecked=0, Total=12432 [2023-04-01 11:06:46,785 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand has 97 states, 97 states have (on average 1.041237113402062) internal successors, (101), 97 states have internal predecessors, (101), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:46,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:06:46,966 INFO L93 Difference]: Finished difference Result 106 states and 153 transitions. [2023-04-01 11:06:46,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-04-01 11:06:46,967 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.041237113402062) internal successors, (101), 97 states have internal predecessors, (101), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2023-04-01 11:06:46,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:06:46,972 INFO L225 Difference]: With dead ends: 106 [2023-04-01 11:06:46,973 INFO L226 Difference]: Without dead ends: 103 [2023-04-01 11:06:46,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2750 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5522, Invalid=6910, Unknown=0, NotChecked=0, Total=12432 [2023-04-01 11:06:46,979 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 11:06:46,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 11:06:46,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-04-01 11:06:46,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2023-04-01 11:06:46,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 99 states have (on average 1.0101010101010102) internal successors, (100), 99 states have internal predecessors, (100), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:46,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2023-04-01 11:06:46,995 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 54 [2023-04-01 11:06:46,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:06:46,996 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2023-04-01 11:06:46,996 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.041237113402062) internal successors, (101), 97 states have internal predecessors, (101), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:06:46,996 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2023-04-01 11:06:46,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-04-01 11:06:46,999 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:06:47,000 INFO L195 NwaCegarLoop]: trace histogram [85, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:06:47,006 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 11:06:47,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:47,206 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:06:47,206 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:06:47,206 INFO L85 PathProgramCache]: Analyzing trace with hash -1745342553, now seen corresponding path program 4 times [2023-04-01 11:06:47,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:06:47,207 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606351380] [2023-04-01 11:06:47,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:06:47,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:06:47,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:55,893 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:06:55,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:06:55,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606351380] [2023-04-01 11:06:55,894 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606351380] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 11:06:55,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793284616] [2023-04-01 11:06:55,895 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 11:06:55,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:06:55,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:06:55,896 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:06:55,897 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 11:06:55,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:06:55,995 INFO L262 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 96 conjunts are in the unsatisfiable core [2023-04-01 11:06:56,002 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:07:05,085 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:07:05,085 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:07:06,376 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:07:06,377 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793284616] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:07:06,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407082396] [2023-04-01 11:07:06,378 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 11:07:06,378 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:07:06,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:07:06,379 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:07:06,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:07:06,408 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 49 for LOIs [2023-04-01 11:07:06,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 11:07:06,539 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:07:09,017 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2473#(and (= ~__return_720~0 0) (= (select |#length| 3) 12) (<= 100 main_~main__x~0) (not (= 100 main_~main__y~0)) (= |old(~__return_720~0)| 0) (= 2 (select |#length| 1)) (= main_~__VERIFIER_assert__cond~0 0) (= (select |#valid| 3) 1) (not (= |#StackHeapBarrier| 0)) (= main_~__tmp_1~0 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= 27 (select |#length| 2)) (= (select (select |#memory_int| 1) 1) 0) (= ~__return_main~0 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:07:09,017 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:07:09,017 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 11:07:09,017 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 196 [2023-04-01 11:07:09,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069439506] [2023-04-01 11:07:09,017 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 11:07:09,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 196 states [2023-04-01 11:07:09,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:07:09,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2023-04-01 11:07:09,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11296, Invalid=33014, Unknown=0, NotChecked=0, Total=44310 [2023-04-01 11:07:09,028 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand has 196 states, 196 states have (on average 1.0714285714285714) internal successors, (210), 196 states have internal predecessors, (210), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:10,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:07:10,983 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2023-04-01 11:07:10,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2023-04-01 11:07:10,984 INFO L78 Accepts]: Start accepts. Automaton has has 196 states, 196 states have (on average 1.0714285714285714) internal successors, (210), 196 states have internal predecessors, (210), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2023-04-01 11:07:10,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:07:10,985 INFO L225 Difference]: With dead ends: 112 [2023-04-01 11:07:10,985 INFO L226 Difference]: Without dead ends: 109 [2023-04-01 11:07:10,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 192 SyntacticMatches, 1 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4149 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=11296, Invalid=33014, Unknown=0, NotChecked=0, Total=44310 [2023-04-01 11:07:10,989 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 5188 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 5188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-04-01 11:07:10,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 5188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5188 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-04-01 11:07:10,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-04-01 11:07:10,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2023-04-01 11:07:10,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 105 states have (on average 1.0095238095238095) internal successors, (106), 105 states have internal predecessors, (106), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:10,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2023-04-01 11:07:10,998 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 102 [2023-04-01 11:07:10,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:07:10,999 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2023-04-01 11:07:10,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 196 states, 196 states have (on average 1.0714285714285714) internal successors, (210), 196 states have internal predecessors, (210), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:07:10,999 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2023-04-01 11:07:11,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-04-01 11:07:11,000 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:07:11,000 INFO L195 NwaCegarLoop]: trace histogram [91, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:07:11,008 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 11:07:11,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:07:11,205 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:07:11,205 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:07:11,205 INFO L85 PathProgramCache]: Analyzing trace with hash 725642663, now seen corresponding path program 5 times [2023-04-01 11:07:11,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:07:11,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740381129] [2023-04-01 11:07:11,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:07:11,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:07:11,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat