/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/nla-digbench-scaling/ps2-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 11:33:07,697 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 11:33:07,698 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 11:33:07,734 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 11:33:07,735 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 11:33:07,735 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 11:33:07,736 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 11:33:07,738 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 11:33:07,740 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 11:33:07,740 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 11:33:07,741 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 11:33:07,742 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 11:33:07,742 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 11:33:07,743 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 11:33:07,744 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 11:33:07,745 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 11:33:07,746 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 11:33:07,747 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 11:33:07,748 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 11:33:07,750 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 11:33:07,751 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 11:33:07,758 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 11:33:07,759 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 11:33:07,760 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 11:33:07,763 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 11:33:07,763 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 11:33:07,763 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 11:33:07,764 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 11:33:07,764 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 11:33:07,765 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 11:33:07,765 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 11:33:07,766 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 11:33:07,766 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 11:33:07,767 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 11:33:07,768 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 11:33:07,768 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 11:33:07,769 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 11:33:07,769 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 11:33:07,769 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 11:33:07,770 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 11:33:07,770 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 11:33:07,779 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 11:33:07,810 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 11:33:07,810 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 11:33:07,810 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 11:33:07,810 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 11:33:07,811 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 11:33:07,811 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 11:33:07,811 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 11:33:07,811 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 11:33:07,811 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 11:33:07,812 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 11:33:07,812 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 11:33:07,812 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 11:33:07,812 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 11:33:07,812 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 11:33:07,812 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 11:33:07,815 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 11:33:07,815 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 11:33:07,815 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 11:33:07,816 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 11:33:07,816 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 11:33:07,816 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 11:33:07,816 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 11:33:07,816 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 11:33:07,817 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 11:33:07,817 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 11:33:07,817 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 11:33:07,817 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 11:33:07,817 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 11:33:07,818 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 11:33:07,818 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 11:33:07,818 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 11:33:07,818 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 11:33:07,818 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:33:07,819 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 11:33:07,819 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 11:33:07,819 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 11:33:07,819 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 11:33:07,819 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 11:33:07,819 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 11:33:07,819 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 11:33:07,819 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 11:33:07,820 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 11:33:08,013 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 11:33:08,038 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 11:33:08,040 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 11:33:08,041 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 11:33:08,041 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 11:33:08,042 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/ps2-ll_unwindbound50.c [2023-04-01 11:33:09,193 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 11:33:09,343 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 11:33:09,344 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/ps2-ll_unwindbound50.c [2023-04-01 11:33:09,348 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5d0336165/950617588fa54d098c8852b1622a7571/FLAGe5ffe5d94 [2023-04-01 11:33:09,759 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5d0336165/950617588fa54d098c8852b1622a7571 [2023-04-01 11:33:09,762 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 11:33:09,764 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 11:33:09,764 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 11:33:09,765 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 11:33:09,767 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 11:33:09,767 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,768 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dcb1fc8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09, skipping insertion in model container [2023-04-01 11:33:09,768 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,773 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 11:33:09,783 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 11:33:09,905 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/nla-digbench-scaling/ps2-ll_unwindbound50.c[454,467] [2023-04-01 11:33:09,919 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:33:09,928 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 11:33:09,937 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/nla-digbench-scaling/ps2-ll_unwindbound50.c[454,467] [2023-04-01 11:33:09,940 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 11:33:09,948 INFO L208 MainTranslator]: Completed translation [2023-04-01 11:33:09,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09 WrapperNode [2023-04-01 11:33:09,949 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 11:33:09,950 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 11:33:09,950 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 11:33:09,950 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 11:33:09,956 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,956 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,961 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,961 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,974 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,976 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,977 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,978 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,979 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 11:33:09,981 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 11:33:09,982 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 11:33:09,982 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 11:33:09,983 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (1/1) ... [2023-04-01 11:33:09,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 11:33:09,998 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:33:10,011 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 11:33:10,013 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 11:33:10,039 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 11:33:10,039 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 11:33:10,040 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 11:33:10,040 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 11:33:10,040 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 11:33:10,040 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 11:33:10,040 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 11:33:10,040 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 11:33:10,040 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 11:33:10,040 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 11:33:10,040 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 11:33:10,041 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 11:33:10,110 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 11:33:10,113 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 11:33:10,264 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 11:33:10,282 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 11:33:10,282 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 11:33:10,284 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:33:10 BoogieIcfgContainer [2023-04-01 11:33:10,285 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 11:33:10,286 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 11:33:10,287 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 11:33:10,289 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 11:33:10,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 11:33:09" (1/3) ... [2023-04-01 11:33:10,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d7e95f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:33:10, skipping insertion in model container [2023-04-01 11:33:10,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 11:33:09" (2/3) ... [2023-04-01 11:33:10,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d7e95f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 11:33:10, skipping insertion in model container [2023-04-01 11:33:10,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 11:33:10" (3/3) ... [2023-04-01 11:33:10,291 INFO L112 eAbstractionObserver]: Analyzing ICFG ps2-ll_unwindbound50.c [2023-04-01 11:33:10,305 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 11:33:10,305 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 11:33:10,389 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 11:33:10,394 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;@1ec5819c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 11:33:10,394 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 11:33:10,408 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 11:33:10,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-01 11:33:10,414 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:33:10,415 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:33:10,415 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:33:10,419 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:33:10,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1383616401, now seen corresponding path program 1 times [2023-04-01 11:33:10,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:33:10,432 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807257895] [2023-04-01 11:33:10,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:33:10,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:33:10,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:33:10,554 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:33:10,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807257895] [2023-04-01 11:33:10,554 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-04-01 11:33:10,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657677439] [2023-04-01 11:33:10,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:33:10,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:33:10,555 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:33:10,558 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 11:33:10,560 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 11:33:10,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:33:10,608 INFO L262 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 1 conjunts are in the unsatisfiable core [2023-04-01 11:33:10,611 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:33:10,629 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 11:33:10,629 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 11:33:10,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657677439] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:33:10,630 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:33:10,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-01 11:33:10,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912642376] [2023-04-01 11:33:10,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:33:10,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-01 11:33:10,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:33:10,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-01 11:33:10,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-01 11:33:10,658 INFO L87 Difference]: Start difference. First operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:33:10,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:33:10,677 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2023-04-01 11:33:10,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-01 11:33:10,679 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 10 [2023-04-01 11:33:10,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:33:10,685 INFO L225 Difference]: With dead ends: 35 [2023-04-01 11:33:10,685 INFO L226 Difference]: Without dead ends: 16 [2023-04-01 11:33:10,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-01 11:33:10,690 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:33:10,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:33:10,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-04-01 11:33:10,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-04-01 11:33:10,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 11:33:10,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2023-04-01 11:33:10,719 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2023-04-01 11:33:10,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:33:10,719 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2023-04-01 11:33:10,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:33:10,720 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2023-04-01 11:33:10,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-01 11:33:10,720 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:33:10,721 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:33:10,730 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 11:33:10,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-04-01 11:33:10,926 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:33:10,927 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:33:10,927 INFO L85 PathProgramCache]: Analyzing trace with hash -344706246, now seen corresponding path program 1 times [2023-04-01 11:33:10,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:33:10,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538590488] [2023-04-01 11:33:10,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:33:10,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:33:10,962 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 11:33:10,963 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1012019273] [2023-04-01 11:33:10,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:33:10,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:33:10,963 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:33:10,968 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 11:33:10,973 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 11:33:11,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:33:11,011 INFO L262 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-01 11:33:11,013 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:33:11,063 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 11:33:11,063 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 11:33:11,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:33:11,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538590488] [2023-04-01 11:33:11,064 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 11:33:11,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012019273] [2023-04-01 11:33:11,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012019273] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:33:11,064 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:33:11,064 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-01 11:33:11,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389118827] [2023-04-01 11:33:11,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:33:11,065 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 11:33:11,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:33:11,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 11:33:11,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:33:11,066 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:33:11,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:33:11,079 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2023-04-01 11:33:11,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 11:33:11,080 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) Word has length 11 [2023-04-01 11:33:11,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:33:11,080 INFO L225 Difference]: With dead ends: 25 [2023-04-01 11:33:11,081 INFO L226 Difference]: Without dead ends: 18 [2023-04-01 11:33:11,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-01 11:33:11,082 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:33:11,083 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 41 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:33:11,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-04-01 11:33:11,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-04-01 11:33:11,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 11:33:11,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-04-01 11:33:11,087 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 11 [2023-04-01 11:33:11,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:33:11,088 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-04-01 11:33:11,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:33:11,088 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-04-01 11:33:11,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-01 11:33:11,089 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:33:11,089 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:33:11,099 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 11:33:11,294 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,SelfDestructingSolverStorable1 [2023-04-01 11:33:11,295 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:33:11,295 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:33:11,295 INFO L85 PathProgramCache]: Analyzing trace with hash -342918786, now seen corresponding path program 1 times [2023-04-01 11:33:11,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:33:11,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128600698] [2023-04-01 11:33:11,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:33:11,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:33:11,312 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 11:33:11,312 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1454105962] [2023-04-01 11:33:11,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:33:11,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:33:11,312 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:33:11,313 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 11:33:11,320 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 11:33:11,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:33:11,369 INFO L262 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 11:33:11,370 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:33:11,428 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 11:33:11,428 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 11:33:11,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:33:11,429 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128600698] [2023-04-01 11:33:11,429 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 11:33:11,429 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454105962] [2023-04-01 11:33:11,429 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454105962] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 11:33:11,429 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 11:33:11,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 11:33:11,430 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190149023] [2023-04-01 11:33:11,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 11:33:11,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 11:33:11,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:33:11,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 11:33:11,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 11:33:11,431 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:33:11,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:33:11,485 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2023-04-01 11:33:11,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 11:33:11,486 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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 11 [2023-04-01 11:33:11,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:33:11,487 INFO L225 Difference]: With dead ends: 27 [2023-04-01 11:33:11,487 INFO L226 Difference]: Without dead ends: 24 [2023-04-01 11:33:11,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-01 11:33:11,490 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:33:11,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 46 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:33:11,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-01 11:33:11,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-04-01 11:33:11,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 11:33:11,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2023-04-01 11:33:11,498 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 11 [2023-04-01 11:33:11,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:33:11,498 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2023-04-01 11:33:11,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 11:33:11,499 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2023-04-01 11:33:11,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 11:33:11,499 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:33:11,499 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:33:11,509 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 11:33:11,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:33:11,708 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:33:11,708 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:33:11,709 INFO L85 PathProgramCache]: Analyzing trace with hash -1383768226, now seen corresponding path program 1 times [2023-04-01 11:33:11,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:33:11,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136943438] [2023-04-01 11:33:11,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:33:11,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:33:11,736 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 11:33:11,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1093082536] [2023-04-01 11:33:11,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:33:11,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:33:11,737 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:33:11,740 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 11:33:11,741 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 11:33:11,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:33:11,782 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 11:33:11,784 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:33:11,819 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:33:11,820 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:33:11,869 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:33:11,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:33:11,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136943438] [2023-04-01 11:33:11,870 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 11:33:11,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093082536] [2023-04-01 11:33:11,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093082536] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:33:11,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818438282] [2023-04-01 11:33:11,906 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 11:33:11,906 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:33:11,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:33:11,913 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:33:11,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:33:12,082 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 47 for LOIs [2023-04-01 11:33:13,093 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 66 for LOIs [2023-04-01 11:33:13,140 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 11:33:13,145 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:33:29,811 WARN L223 SmtUtils]: Spent 16.14s on a formula simplification. DAG size of input: 66 DAG size of output: 47 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-01 11:33:49,294 WARN L223 SmtUtils]: Spent 16.09s on a formula simplification. DAG size of input: 68 DAG size of output: 49 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-01 11:34:04,989 WARN L223 SmtUtils]: Spent 8.08s on a formula simplification. DAG size of input: 70 DAG size of output: 46 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-01 11:34:05,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '450#(and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (not (= |#StackHeapBarrier| 0)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |#NULL.base| 0))' at error location [2023-04-01 11:34:05,155 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 11:34:05,156 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 11:34:05,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-04-01 11:34:05,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976666814] [2023-04-01 11:34:05,156 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 11:34:05,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-01 11:34:05,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 11:34:05,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-01 11:34:05,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=352, Unknown=3, NotChecked=0, Total=420 [2023-04-01 11:34:05,158 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 11:34:09,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 11:34:09,033 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2023-04-01 11:34:09,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-01 11:34:09,034 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 19 [2023-04-01 11:34:09,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 11:34:09,035 INFO L225 Difference]: With dead ends: 55 [2023-04-01 11:34:09,035 INFO L226 Difference]: Without dead ends: 48 [2023-04-01 11:34:09,035 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 55.9s TimeCoverageRelationStatistics Valid=85, Invalid=464, Unknown=3, NotChecked=0, Total=552 [2023-04-01 11:34:09,036 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 19 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 11:34:09,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 63 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 11:34:09,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-04-01 11:34:09,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2023-04-01 11:34:09,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 32 states have internal predecessors, (36), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 11:34:09,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2023-04-01 11:34:09,043 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 19 [2023-04-01 11:34:09,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 11:34:09,043 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2023-04-01 11:34:09,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-04-01 11:34:09,043 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2023-04-01 11:34:09,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 11:34:09,044 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 11:34:09,044 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 11:34:09,052 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 11:34:09,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:34:09,244 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 11:34:09,245 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 11:34:09,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1381980766, now seen corresponding path program 1 times [2023-04-01 11:34:09,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 11:34:09,245 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052346453] [2023-04-01 11:34:09,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:34:09,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 11:34:09,254 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-01 11:34:09,254 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [112726068] [2023-04-01 11:34:09,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 11:34:09,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 11:34:09,254 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 11:34:09,255 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 11:34:09,257 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 11:34:09,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 11:34:09,296 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 19 conjunts are in the unsatisfiable core [2023-04-01 11:34:09,298 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 11:34:09,351 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:34:09,352 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 11:34:09,418 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 11:34:09,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 11:34:09,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052346453] [2023-04-01 11:34:09,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-01 11:34:09,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112726068] [2023-04-01 11:34:09,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112726068] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 11:34:09,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211968197] [2023-04-01 11:34:09,420 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-01 11:34:09,421 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 11:34:09,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 11:34:09,421 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 11:34:09,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 11:34:09,467 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 47 for LOIs [2023-04-01 11:34:09,998 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2023-04-01 11:34:10,064 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 11:34:10,068 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 11:34:26,257 WARN L223 SmtUtils]: Spent 9.67s on a formula simplification. DAG size of input: 62 DAG size of output: 49 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)