/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain IntervalDomain -i ../sv-benchmarks/c/array-multidimensional/init-2-n-u.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 20:52:33,904 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 20:52:33,906 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 20:52:33,933 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 20:52:33,934 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 20:52:33,936 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 20:52:33,939 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 20:52:33,940 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 20:52:33,943 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 20:52:33,946 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 20:52:33,947 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 20:52:33,948 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 20:52:33,949 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 20:52:33,950 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 20:52:33,951 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 20:52:33,952 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 20:52:33,952 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 20:52:33,953 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 20:52:33,954 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 20:52:33,958 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 20:52:33,958 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 20:52:33,959 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 20:52:33,960 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 20:52:33,960 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 20:52:33,966 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 20:52:33,966 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 20:52:33,967 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 20:52:33,968 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 20:52:33,968 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 20:52:33,969 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 20:52:33,969 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 20:52:33,969 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 20:52:33,970 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 20:52:33,971 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 20:52:33,971 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 20:52:33,971 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 20:52:33,972 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 20:52:33,972 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 20:52:33,972 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 20:52:33,972 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 20:52:33,973 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 20:52:33,974 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-03-31 20:52:33,996 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 20:52:33,996 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 20:52:33,997 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 20:52:33,997 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 20:52:33,997 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 20:52:33,997 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 20:52:33,997 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 20:52:33,998 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 20:52:33,998 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 20:52:33,998 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 20:52:33,998 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 20:52:33,998 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 20:52:33,998 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 20:52:33,998 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 20:52:33,999 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 20:52:33,999 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 20:52:33,999 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 20:52:33,999 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 20:52:33,999 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 20:52:33,999 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 20:52:33,999 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 20:52:33,999 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 20:52:33,999 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 20:52:34,000 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 20:52:34,000 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 20:52:34,000 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 20:52:34,000 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 20:52:34,000 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 20:52:34,000 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 20:52:34,000 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 20:52:34,001 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:52:34,001 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 20:52:34,001 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 20:52:34,002 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 20:52:34,202 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 20:52:34,220 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 20:52:34,222 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 20:52:34,223 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 20:52:34,224 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 20:52:34,224 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-multidimensional/init-2-n-u.c [2023-03-31 20:52:35,360 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 20:52:35,510 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 20:52:35,511 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/init-2-n-u.c [2023-03-31 20:52:35,515 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc2e361b2/ae0d09434ecb43739c3a7a45ce7a59e6/FLAGd8465b25a [2023-03-31 20:52:35,526 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc2e361b2/ae0d09434ecb43739c3a7a45ce7a59e6 [2023-03-31 20:52:35,527 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 20:52:35,528 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 20:52:35,531 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 20:52:35,531 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 20:52:35,533 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 20:52:35,534 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,535 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@760e38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35, skipping insertion in model container [2023-03-31 20:52:35,535 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,541 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 20:52:35,552 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 20:52:35,639 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/init-2-n-u.c[322,335] [2023-03-31 20:52:35,648 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:52:35,654 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 20:52:35,661 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/init-2-n-u.c[322,335] [2023-03-31 20:52:35,664 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 20:52:35,672 INFO L208 MainTranslator]: Completed translation [2023-03-31 20:52:35,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35 WrapperNode [2023-03-31 20:52:35,672 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 20:52:35,673 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 20:52:35,673 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 20:52:35,673 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 20:52:35,680 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,684 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,684 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,688 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,690 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,690 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,691 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,692 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 20:52:35,692 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 20:52:35,693 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 20:52:35,693 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 20:52:35,693 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (1/1) ... [2023-03-31 20:52:35,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 20:52:35,705 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:35,719 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-03-31 20:52:35,733 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-03-31 20:52:35,752 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 20:52:35,752 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 20:52:35,752 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 20:52:35,752 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 20:52:35,752 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 20:52:35,752 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 20:52:35,752 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 20:52:35,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 20:52:35,754 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 20:52:35,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 20:52:35,796 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 20:52:35,797 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 20:52:35,904 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 20:52:35,924 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 20:52:35,925 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-03-31 20:52:35,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:52:35 BoogieIcfgContainer [2023-03-31 20:52:35,926 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 20:52:35,928 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 20:52:35,928 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 20:52:35,930 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 20:52:35,930 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 08:52:35" (1/3) ... [2023-03-31 20:52:35,931 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@631bc13f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:52:35, skipping insertion in model container [2023-03-31 20:52:35,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 08:52:35" (2/3) ... [2023-03-31 20:52:35,931 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@631bc13f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 08:52:35, skipping insertion in model container [2023-03-31 20:52:35,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 08:52:35" (3/3) ... [2023-03-31 20:52:35,932 INFO L112 eAbstractionObserver]: Analyzing ICFG init-2-n-u.c [2023-03-31 20:52:35,943 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 20:52:35,943 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 20:52:35,971 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 20:52:35,975 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;@4ff3438b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 20:52:35,975 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 20:52:35,978 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 20:52:35,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-03-31 20:52:35,982 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:35,983 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:35,983 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:35,986 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:35,986 INFO L85 PathProgramCache]: Analyzing trace with hash 1717213980, now seen corresponding path program 1 times [2023-03-31 20:52:35,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:35,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300632566] [2023-03-31 20:52:35,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:35,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:36,050 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:36,051 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2079752874] [2023-03-31 20:52:36,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:36,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:36,051 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:36,054 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:36,085 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 20:52:36,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:36,124 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2023-03-31 20:52:36,127 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:36,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:36,216 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 20:52:36,217 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:36,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300632566] [2023-03-31 20:52:36,217 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:52:36,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079752874] [2023-03-31 20:52:36,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079752874] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:52:36,218 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:52:36,218 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 20:52:36,219 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715870059] [2023-03-31 20:52:36,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:52:36,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 20:52:36,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:36,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 20:52:36,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 20:52:36,243 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:36,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:36,289 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2023-03-31 20:52:36,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 20:52:36,291 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-03-31 20:52:36,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:36,296 INFO L225 Difference]: With dead ends: 35 [2023-03-31 20:52:36,297 INFO L226 Difference]: Without dead ends: 19 [2023-03-31 20:52:36,299 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 20:52:36,301 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 2 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:36,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 29 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:52:36,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-03-31 20:52:36,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2023-03-31 20:52:36,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 20:52:36,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2023-03-31 20:52:36,337 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 12 [2023-03-31 20:52:36,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:36,337 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2023-03-31 20:52:36,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:36,338 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2023-03-31 20:52:36,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-03-31 20:52:36,338 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:36,338 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:36,343 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 20:52:36,543 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 [2023-03-31 20:52:36,544 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:36,545 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:36,545 INFO L85 PathProgramCache]: Analyzing trace with hash 1335624973, now seen corresponding path program 1 times [2023-03-31 20:52:36,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:36,546 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810189374] [2023-03-31 20:52:36,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:36,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:36,563 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:36,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [102867879] [2023-03-31 20:52:36,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:36,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:36,564 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:36,577 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:36,579 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 20:52:36,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:36,633 INFO L262 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2023-03-31 20:52:36,634 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:36,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:36,658 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 20:52:36,658 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:36,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810189374] [2023-03-31 20:52:36,658 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:52:36,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102867879] [2023-03-31 20:52:36,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102867879] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 20:52:36,659 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 20:52:36,659 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-03-31 20:52:36,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737524749] [2023-03-31 20:52:36,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 20:52:36,659 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-03-31 20:52:36,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:36,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-03-31 20:52:36,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-03-31 20:52:36,660 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:36,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:36,705 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2023-03-31 20:52:36,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 20:52:36,705 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 14 [2023-03-31 20:52:36,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:36,730 INFO L225 Difference]: With dead ends: 35 [2023-03-31 20:52:36,730 INFO L226 Difference]: Without dead ends: 23 [2023-03-31 20:52:36,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-03-31 20:52:36,731 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 12 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:36,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 22 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:52:36,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-03-31 20:52:36,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2023-03-31 20:52:36,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 20:52:36,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-03-31 20:52:36,740 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2023-03-31 20:52:36,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:36,740 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-03-31 20:52:36,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:36,740 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-03-31 20:52:36,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-03-31 20:52:36,741 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:36,741 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:36,746 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-03-31 20:52:36,943 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 [2023-03-31 20:52:36,944 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:36,945 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:36,945 INFO L85 PathProgramCache]: Analyzing trace with hash -941419937, now seen corresponding path program 1 times [2023-03-31 20:52:36,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:36,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375226773] [2023-03-31 20:52:36,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:36,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:36,964 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:36,964 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1853239701] [2023-03-31 20:52:36,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:36,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:36,965 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:36,973 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:36,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 20:52:37,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:37,056 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:52:37,057 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:37,086 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:37,086 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:37,130 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 20:52:37,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:37,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375226773] [2023-03-31 20:52:37,130 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:52:37,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853239701] [2023-03-31 20:52:37,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853239701] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:37,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1616839007] [2023-03-31 20:52:37,149 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-03-31 20:52:37,149 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:37,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:37,160 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:37,161 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:37,237 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:52:37,423 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-03-31 20:52:37,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:52:37,435 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:37,569 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '366#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 20:52:37,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:37,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:52:37,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-03-31 20:52:37,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097347820] [2023-03-31 20:52:37,569 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:37,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-03-31 20:52:37,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:37,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-03-31 20:52:37,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2023-03-31 20:52:37,572 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:37,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:37,647 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2023-03-31 20:52:37,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 20:52:37,648 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-03-31 20:52:37,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:37,650 INFO L225 Difference]: With dead ends: 47 [2023-03-31 20:52:37,650 INFO L226 Difference]: Without dead ends: 33 [2023-03-31 20:52:37,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2023-03-31 20:52:37,655 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 42 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:37,659 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 40 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:52:37,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-03-31 20:52:37,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2023-03-31 20:52:37,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 20:52:37,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2023-03-31 20:52:37,668 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 15 [2023-03-31 20:52:37,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:37,668 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2023-03-31 20:52:37,668 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:37,668 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2023-03-31 20:52:37,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-03-31 20:52:37,668 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:37,668 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:37,673 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-03-31 20:52:37,873 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 [2023-03-31 20:52:37,873 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:37,874 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:37,874 INFO L85 PathProgramCache]: Analyzing trace with hash -1348613747, now seen corresponding path program 2 times [2023-03-31 20:52:37,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:37,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948439090] [2023-03-31 20:52:37,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:37,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:37,890 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:37,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [509711971] [2023-03-31 20:52:37,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:52:37,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:37,891 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:37,902 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:37,903 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 20:52:37,942 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-03-31 20:52:37,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:52:37,943 INFO L262 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 20:52:37,947 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:37,977 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-03-31 20:52:37,977 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:38,022 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-03-31 20:52:38,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:38,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948439090] [2023-03-31 20:52:38,025 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:52:38,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509711971] [2023-03-31 20:52:38,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509711971] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:38,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936140352] [2023-03-31 20:52:38,030 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-03-31 20:52:38,030 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:38,030 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:38,030 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:38,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:38,048 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:52:38,114 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-03-31 20:52:38,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:52:38,120 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:38,240 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '624#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 20:52:38,240 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:38,240 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:52:38,240 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2023-03-31 20:52:38,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182159161] [2023-03-31 20:52:38,241 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:38,241 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-03-31 20:52:38,241 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:38,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-03-31 20:52:38,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2023-03-31 20:52:38,242 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:38,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:38,269 INFO L93 Difference]: Finished difference Result 70 states and 86 transitions. [2023-03-31 20:52:38,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 20:52:38,270 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-03-31 20:52:38,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:38,270 INFO L225 Difference]: With dead ends: 70 [2023-03-31 20:52:38,270 INFO L226 Difference]: Without dead ends: 50 [2023-03-31 20:52:38,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2023-03-31 20:52:38,271 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:38,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 32 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 20:52:38,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-03-31 20:52:38,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-03-31 20:52:38,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 41 states have (on average 1.170731707317073) internal successors, (48), 41 states have internal predecessors, (48), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 20:52:38,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2023-03-31 20:52:38,278 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 18 [2023-03-31 20:52:38,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:38,278 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2023-03-31 20:52:38,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:38,278 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2023-03-31 20:52:38,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-03-31 20:52:38,278 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:38,278 INFO L195 NwaCegarLoop]: trace histogram [16, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:38,285 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:38,483 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 [2023-03-31 20:52:38,483 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:38,484 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:38,484 INFO L85 PathProgramCache]: Analyzing trace with hash -957120416, now seen corresponding path program 3 times [2023-03-31 20:52:38,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:38,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129548029] [2023-03-31 20:52:38,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:38,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:38,496 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:38,496 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1631065634] [2023-03-31 20:52:38,496 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:52:38,496 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:38,496 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:38,497 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:38,499 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 20:52:39,707 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 20:52:39,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:52:39,710 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 7 conjunts are in the unsatisfiable core [2023-03-31 20:52:39,712 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:39,765 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 131 proven. 10 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-03-31 20:52:39,765 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:39,818 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 106 proven. 35 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-03-31 20:52:39,818 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:39,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129548029] [2023-03-31 20:52:39,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:52:39,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631065634] [2023-03-31 20:52:39,818 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1631065634] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:39,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1747842752] [2023-03-31 20:52:39,820 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-03-31 20:52:39,820 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:39,820 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:39,820 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:39,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:39,833 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:52:39,910 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-03-31 20:52:39,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:52:39,915 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:40,030 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1073#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 20:52:40,030 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:40,030 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:52:40,030 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2023-03-31 20:52:40,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600095057] [2023-03-31 20:52:40,030 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:40,031 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-03-31 20:52:40,031 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:40,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-03-31 20:52:40,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2023-03-31 20:52:40,032 INFO L87 Difference]: Start difference. First operand 50 states and 59 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:40,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:40,161 INFO L93 Difference]: Finished difference Result 132 states and 185 transitions. [2023-03-31 20:52:40,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-03-31 20:52:40,161 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2023-03-31 20:52:40,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:40,162 INFO L225 Difference]: With dead ends: 132 [2023-03-31 20:52:40,162 INFO L226 Difference]: Without dead ends: 93 [2023-03-31 20:52:40,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2023-03-31 20:52:40,163 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 71 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:40,163 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 49 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:52:40,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-03-31 20:52:40,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2023-03-31 20:52:40,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 77 states have (on average 1.0909090909090908) internal successors, (84), 77 states have internal predecessors, (84), 12 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-03-31 20:52:40,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 107 transitions. [2023-03-31 20:52:40,173 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 107 transitions. Word has length 36 [2023-03-31 20:52:40,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:40,173 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 107 transitions. [2023-03-31 20:52:40,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:40,173 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 107 transitions. [2023-03-31 20:52:40,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-03-31 20:52:40,174 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:40,174 INFO L195 NwaCegarLoop]: trace histogram [40, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:40,200 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:40,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:40,382 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:40,382 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:40,383 INFO L85 PathProgramCache]: Analyzing trace with hash -247429408, now seen corresponding path program 4 times [2023-03-31 20:52:40,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:40,383 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18860258] [2023-03-31 20:52:40,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:40,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:40,399 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:40,399 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [350375319] [2023-03-31 20:52:40,399 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 20:52:40,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:40,400 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:40,401 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:40,402 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 20:52:40,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 20:52:40,488 INFO L262 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 13 conjunts are in the unsatisfiable core [2023-03-31 20:52:40,489 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:52:40,597 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 367 proven. 55 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2023-03-31 20:52:40,597 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:52:40,746 INFO L134 CoverageAnalysis]: Checked inductivity of 956 backedges. 367 proven. 55 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2023-03-31 20:52:40,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:52:40,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18860258] [2023-03-31 20:52:40,746 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:52:40,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350375319] [2023-03-31 20:52:40,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350375319] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:52:40,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [922140523] [2023-03-31 20:52:40,748 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-03-31 20:52:40,748 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:52:40,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:52:40,748 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:52:40,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:52:40,759 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:52:40,827 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-03-31 20:52:40,829 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:52:40,832 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:52:40,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1884#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 20:52:40,950 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:52:40,950 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:52:40,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2023-03-31 20:52:40,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127757166] [2023-03-31 20:52:40,951 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:52:40,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-03-31 20:52:40,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:52:40,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-03-31 20:52:40,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=995, Unknown=0, NotChecked=0, Total=1332 [2023-03-31 20:52:40,952 INFO L87 Difference]: Start difference. First operand 92 states and 107 transitions. Second operand has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:41,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:52:41,303 INFO L93 Difference]: Finished difference Result 252 states and 353 transitions. [2023-03-31 20:52:41,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-03-31 20:52:41,304 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2023-03-31 20:52:41,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:52:41,305 INFO L225 Difference]: With dead ends: 252 [2023-03-31 20:52:41,305 INFO L226 Difference]: Without dead ends: 177 [2023-03-31 20:52:41,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 799 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=623, Invalid=1633, Unknown=0, NotChecked=0, Total=2256 [2023-03-31 20:52:41,307 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 105 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 20:52:41,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 76 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 20:52:41,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2023-03-31 20:52:41,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 176. [2023-03-31 20:52:41,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 149 states have (on average 1.0469798657718121) internal successors, (156), 149 states have internal predecessors, (156), 24 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2023-03-31 20:52:41,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 203 transitions. [2023-03-31 20:52:41,325 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 203 transitions. Word has length 60 [2023-03-31 20:52:41,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:52:41,325 INFO L495 AbstractCegarLoop]: Abstraction has 176 states and 203 transitions. [2023-03-31 20:52:41,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:52:41,326 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 203 transitions. [2023-03-31 20:52:41,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-03-31 20:52:41,327 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:52:41,327 INFO L195 NwaCegarLoop]: trace histogram [88, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:52:41,334 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-03-31 20:52:41,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:41,535 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:52:41,535 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:52:41,535 INFO L85 PathProgramCache]: Analyzing trace with hash 32584672, now seen corresponding path program 5 times [2023-03-31 20:52:41,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:52:41,535 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955703708] [2023-03-31 20:52:41,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:52:41,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:52:41,561 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:52:41,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [516202780] [2023-03-31 20:52:41,562 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 20:52:41,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:52:41,562 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:52:41,582 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:52:41,583 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-03-31 20:53:37,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2023-03-31 20:53:37,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 20:53:37,138 INFO L262 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 25 conjunts are in the unsatisfiable core [2023-03-31 20:53:37,140 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 20:53:37,534 INFO L134 CoverageAnalysis]: Checked inductivity of 4196 backedges. 1591 proven. 253 refuted. 0 times theorem prover too weak. 2352 trivial. 0 not checked. [2023-03-31 20:53:37,534 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 20:53:38,085 INFO L134 CoverageAnalysis]: Checked inductivity of 4196 backedges. 4 proven. 1840 refuted. 0 times theorem prover too weak. 2352 trivial. 0 not checked. [2023-03-31 20:53:38,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 20:53:38,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955703708] [2023-03-31 20:53:38,085 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 20:53:38,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [516202780] [2023-03-31 20:53:38,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [516202780] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 20:53:38,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1784853292] [2023-03-31 20:53:38,087 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-03-31 20:53:38,087 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 20:53:38,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 20:53:38,087 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 20:53:38,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 20:53:38,100 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 20:53:38,151 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-03-31 20:53:38,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 20:53:38,156 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 20:53:38,259 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3397#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-03-31 20:53:38,260 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 20:53:38,260 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 20:53:38,260 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2023-03-31 20:53:38,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078667038] [2023-03-31 20:53:38,260 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 20:53:38,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-03-31 20:53:38,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 20:53:38,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-03-31 20:53:38,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1213, Invalid=2447, Unknown=0, NotChecked=0, Total=3660 [2023-03-31 20:53:38,264 INFO L87 Difference]: Start difference. First operand 176 states and 203 transitions. Second operand has 50 states, 50 states have (on average 1.26) internal successors, (63), 50 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:53:39,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 20:53:39,319 INFO L93 Difference]: Finished difference Result 492 states and 689 transitions. [2023-03-31 20:53:39,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-03-31 20:53:39,319 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.26) internal successors, (63), 50 states have internal predecessors, (63), 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 108 [2023-03-31 20:53:39,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 20:53:39,320 INFO L225 Difference]: With dead ends: 492 [2023-03-31 20:53:39,321 INFO L226 Difference]: Without dead ends: 345 [2023-03-31 20:53:39,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2215 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2363, Invalid=4609, Unknown=0, NotChecked=0, Total=6972 [2023-03-31 20:53:39,323 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 217 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 371 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 20:53:39,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [240 Valid, 67 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [371 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 20:53:39,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2023-03-31 20:53:39,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 344. [2023-03-31 20:53:39,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 293 states have (on average 1.023890784982935) internal successors, (300), 293 states have internal predecessors, (300), 48 states have call successors, (48), 3 states have call predecessors, (48), 2 states have return successors, (47), 47 states have call predecessors, (47), 47 states have call successors, (47) [2023-03-31 20:53:39,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 395 transitions. [2023-03-31 20:53:39,344 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 395 transitions. Word has length 108 [2023-03-31 20:53:39,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 20:53:39,345 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 395 transitions. [2023-03-31 20:53:39,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.26) internal successors, (63), 50 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 20:53:39,345 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 395 transitions. [2023-03-31 20:53:39,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2023-03-31 20:53:39,346 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 20:53:39,347 INFO L195 NwaCegarLoop]: trace histogram [184, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 20:53:39,388 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-03-31 20:53:39,565 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:53:39,565 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 20:53:39,565 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 20:53:39,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1483541984, now seen corresponding path program 6 times [2023-03-31 20:53:39,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 20:53:39,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331597304] [2023-03-31 20:53:39,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 20:53:39,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 20:53:39,611 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 20:53:39,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1778862622] [2023-03-31 20:53:39,611 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 20:53:39,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 20:53:39,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 20:53:39,612 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 20:53:39,665 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process