/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 OctagonDomain -i ../sv-benchmarks/c/array-tiling/rewnif.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 02:48:16,069 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 02:48:16,071 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 02:48:16,107 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 02:48:16,107 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 02:48:16,110 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 02:48:16,113 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 02:48:16,115 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 02:48:16,116 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 02:48:16,121 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 02:48:16,122 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 02:48:16,124 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 02:48:16,124 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 02:48:16,126 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 02:48:16,127 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 02:48:16,128 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 02:48:16,129 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 02:48:16,130 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 02:48:16,132 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 02:48:16,137 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 02:48:16,138 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 02:48:16,139 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 02:48:16,141 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 02:48:16,142 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 02:48:16,149 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 02:48:16,150 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 02:48:16,150 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 02:48:16,151 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 02:48:16,152 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 02:48:16,152 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 02:48:16,152 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 02:48:16,153 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 02:48:16,154 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 02:48:16,155 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 02:48:16,156 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 02:48:16,156 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 02:48:16,156 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 02:48:16,156 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 02:48:16,157 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 02:48:16,157 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 02:48:16,158 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 02:48:16,159 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-01 02:48:16,189 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 02:48:16,189 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 02:48:16,190 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 02:48:16,190 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 02:48:16,191 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 02:48:16,191 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 02:48:16,191 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 02:48:16,191 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 02:48:16,191 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 02:48:16,191 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 02:48:16,192 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 02:48:16,192 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 02:48:16,192 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 02:48:16,192 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 02:48:16,192 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 02:48:16,193 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 02:48:16,193 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 02:48:16,193 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 02:48:16,193 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 02:48:16,194 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 02:48:16,194 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 02:48:16,194 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 02:48:16,194 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 02:48:16,194 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 02:48:16,194 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 02:48:16,194 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 02:48:16,194 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 02:48:16,195 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 02:48:16,195 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 02:48:16,195 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 02:48:16,195 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 02:48:16,195 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 02:48:16,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 02:48:16,196 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 02:48:16,196 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 02:48:16,196 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 02:48:16,196 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 02:48:16,196 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 02:48:16,196 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 02:48:16,196 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 02:48:16,196 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 02:48:16,196 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-01 02:48:16,417 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 02:48:16,441 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 02:48:16,443 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 02:48:16,444 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 02:48:16,445 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 02:48:16,446 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-tiling/rewnif.c [2023-04-01 02:48:17,574 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 02:48:17,769 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 02:48:17,770 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-tiling/rewnif.c [2023-04-01 02:48:17,775 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e04ef9423/66d352fb97214237bb7dac964a13124a/FLAG9ee747152 [2023-04-01 02:48:17,791 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e04ef9423/66d352fb97214237bb7dac964a13124a [2023-04-01 02:48:17,793 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 02:48:17,794 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 02:48:17,796 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 02:48:17,796 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 02:48:17,799 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 02:48:17,800 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:17,801 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39e7cf2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17, skipping insertion in model container [2023-04-01 02:48:17,801 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:17,808 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 02:48:17,827 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 02:48:17,941 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-tiling/rewnif.c[397,410] [2023-04-01 02:48:17,954 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 02:48:17,965 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 02:48:17,973 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-tiling/rewnif.c[397,410] [2023-04-01 02:48:17,978 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 02:48:17,994 INFO L208 MainTranslator]: Completed translation [2023-04-01 02:48:17,994 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17 WrapperNode [2023-04-01 02:48:17,995 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 02:48:17,996 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 02:48:17,996 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 02:48:17,996 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 02:48:18,007 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,007 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,014 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,014 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,020 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,023 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,024 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,025 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,027 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 02:48:18,027 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 02:48:18,028 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 02:48:18,028 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 02:48:18,029 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (1/1) ... [2023-04-01 02:48:18,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 02:48:18,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:18,057 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-01 02:48:18,059 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-01 02:48:18,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 02:48:18,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 02:48:18,091 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 02:48:18,091 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-01 02:48:18,091 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-01 02:48:18,091 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-01 02:48:18,092 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 02:48:18,093 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-01 02:48:18,093 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 02:48:18,093 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 02:48:18,093 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 02:48:18,093 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 02:48:18,093 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 02:48:18,093 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 02:48:18,153 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 02:48:18,155 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 02:48:18,287 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 02:48:18,325 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 02:48:18,325 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-01 02:48:18,327 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 02:48:18 BoogieIcfgContainer [2023-04-01 02:48:18,327 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 02:48:18,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 02:48:18,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 02:48:18,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 02:48:18,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 02:48:17" (1/3) ... [2023-04-01 02:48:18,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31ed1e2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 02:48:18, skipping insertion in model container [2023-04-01 02:48:18,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 02:48:17" (2/3) ... [2023-04-01 02:48:18,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31ed1e2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 02:48:18, skipping insertion in model container [2023-04-01 02:48:18,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 02:48:18" (3/3) ... [2023-04-01 02:48:18,335 INFO L112 eAbstractionObserver]: Analyzing ICFG rewnif.c [2023-04-01 02:48:18,354 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 02:48:18,355 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 02:48:18,419 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 02:48:18,424 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;@1543f834, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 02:48:18,424 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 02:48:18,428 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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) [2023-04-01 02:48:18,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-01 02:48:18,433 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:18,434 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:18,434 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:18,438 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:18,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1538200716, now seen corresponding path program 1 times [2023-04-01 02:48:18,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:18,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877544564] [2023-04-01 02:48:18,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:18,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:18,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:18,683 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:18,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:18,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877544564] [2023-04-01 02:48:18,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877544564] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 02:48:18,685 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 02:48:18,685 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 02:48:18,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272658998] [2023-04-01 02:48:18,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 02:48:18,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 02:48:18,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:18,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 02:48:18,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 02:48:18,734 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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) [2023-04-01 02:48:18,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:18,781 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-04-01 02:48:18,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 02:48:18,784 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 [2023-04-01 02:48:18,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:18,789 INFO L225 Difference]: With dead ends: 34 [2023-04-01 02:48:18,790 INFO L226 Difference]: Without dead ends: 17 [2023-04-01 02:48:18,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 02:48:18,795 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 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 [2023-04-01 02:48:18,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:48:18,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-04-01 02:48:18,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-04-01 02:48:18,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 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) [2023-04-01 02:48:18,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-04-01 02:48:18,824 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2023-04-01 02:48:18,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:18,824 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-04-01 02:48:18,824 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) [2023-04-01 02:48:18,825 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-04-01 02:48:18,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-01 02:48:18,825 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:18,825 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:18,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 02:48:18,826 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:18,827 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:18,827 INFO L85 PathProgramCache]: Analyzing trace with hash -866847342, now seen corresponding path program 1 times [2023-04-01 02:48:18,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:18,827 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79367794] [2023-04-01 02:48:18,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:18,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:18,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:19,040 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:19,040 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:19,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79367794] [2023-04-01 02:48:19,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79367794] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:19,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372779661] [2023-04-01 02:48:19,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:19,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:19,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:19,045 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:19,048 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 02:48:19,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:19,141 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 02:48:19,145 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:19,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:19,238 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:19,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:19,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372779661] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:19,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1664398364] [2023-04-01 02:48:19,301 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:48:19,301 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:19,304 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:19,310 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:19,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:19,479 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:19,651 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2023-04-01 02:48:19,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:19,710 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:20,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '180#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((v_main_~a~0.base_BEFORE_CALL_1 Int)) (and (<= (+ v_main_~a~0.base_BEFORE_CALL_1 1) |#StackHeapBarrier|) (< (select (select |#memory_int| v_main_~a~0.base_BEFORE_CALL_1) 0) 0))) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:20,161 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:20,161 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:20,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-01 02:48:20,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455524402] [2023-04-01 02:48:20,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:20,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 02:48:20,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:20,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 02:48:20,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-04-01 02:48:20,167 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:20,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:20,210 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2023-04-01 02:48:20,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-01 02:48:20,210 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-01 02:48:20,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:20,211 INFO L225 Difference]: With dead ends: 27 [2023-04-01 02:48:20,211 INFO L226 Difference]: Without dead ends: 18 [2023-04-01 02:48:20,212 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2023-04-01 02:48:20,215 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:20,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 29 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 02:48:20,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-04-01 02:48:20,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-04-01 02:48:20,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 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) [2023-04-01 02:48:20,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2023-04-01 02:48:20,225 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2023-04-01 02:48:20,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:20,225 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2023-04-01 02:48:20,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 7 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:20,225 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2023-04-01 02:48:20,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-01 02:48:20,226 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:20,227 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:20,235 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 02:48:20,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:20,433 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:20,433 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:20,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1529729228, now seen corresponding path program 2 times [2023-04-01 02:48:20,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:20,435 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135416791] [2023-04-01 02:48:20,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:20,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:20,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:20,968 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:20,968 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:20,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135416791] [2023-04-01 02:48:20,970 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135416791] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:20,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026371262] [2023-04-01 02:48:20,970 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:48:20,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:20,970 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:20,971 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:20,974 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 02:48:21,033 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-01 02:48:21,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:48:21,034 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-01 02:48:21,037 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:21,081 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 02:48:21,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2023-04-01 02:48:21,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 48 [2023-04-01 02:48:21,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:48:21,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2023-04-01 02:48:21,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-04-01 02:48:21,303 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 02:48:21,339 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:21,339 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:21,456 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2023-04-01 02:48:21,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 50 [2023-04-01 02:48:21,511 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:21,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026371262] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:21,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1740686532] [2023-04-01 02:48:21,523 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-01 02:48:21,524 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:21,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:21,524 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:21,524 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:21,564 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:21,649 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2023-04-01 02:48:21,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:21,693 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:22,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '360#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (exists ((v_main_~a~0.base_BEFORE_CALL_2 Int)) (and (<= (+ v_main_~a~0.base_BEFORE_CALL_2 1) |#StackHeapBarrier|) (< (select (select |#memory_int| v_main_~a~0.base_BEFORE_CALL_2) 0) 0))) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:22,176 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:22,176 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:22,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2023-04-01 02:48:22,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531692430] [2023-04-01 02:48:22,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:22,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 02:48:22,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:22,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 02:48:22,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2023-04-01 02:48:22,178 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 20 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:22,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:22,333 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2023-04-01 02:48:22,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 02:48:22,334 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-04-01 02:48:22,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:22,334 INFO L225 Difference]: With dead ends: 27 [2023-04-01 02:48:22,334 INFO L226 Difference]: Without dead ends: 25 [2023-04-01 02:48:22,335 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2023-04-01 02:48:22,336 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 17 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:22,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 89 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 02:48:22,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-04-01 02:48:22,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2023-04-01 02:48:22,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 02:48:22,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-04-01 02:48:22,342 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 14 [2023-04-01 02:48:22,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:22,342 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-04-01 02:48:22,342 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 02:48:22,342 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-04-01 02:48:22,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-01 02:48:22,343 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:22,343 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:22,351 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:22,549 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-01 02:48:22,549 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:22,550 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:22,550 INFO L85 PathProgramCache]: Analyzing trace with hash 1923393446, now seen corresponding path program 1 times [2023-04-01 02:48:22,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:22,550 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489279441] [2023-04-01 02:48:22,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:22,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:22,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:22,775 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:22,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:22,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489279441] [2023-04-01 02:48:22,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [489279441] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:22,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695644594] [2023-04-01 02:48:22,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:22,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:22,779 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:22,780 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:22,783 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 02:48:22,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:22,838 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-01 02:48:22,843 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:22,876 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 02:48:22,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 02:48:23,037 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:23,037 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:23,084 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-01 02:48:23,087 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-04-01 02:48:23,097 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:23,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695644594] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:23,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010857447] [2023-04-01 02:48:23,099 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:48:23,099 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:23,100 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:23,100 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:23,100 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:23,158 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:23,455 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:48:23,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:23,531 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:24,210 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '599#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:24,210 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:24,210 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:24,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10] total 20 [2023-04-01 02:48:24,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97454565] [2023-04-01 02:48:24,211 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:24,211 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 02:48:24,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:24,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 02:48:24,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=892, Unknown=0, NotChecked=0, Total=992 [2023-04-01 02:48:24,212 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 20 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 6 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:48:26,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:26,284 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2023-04-01 02:48:26,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-01 02:48:26,285 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 6 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-04-01 02:48:26,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:26,287 INFO L225 Difference]: With dead ends: 54 [2023-04-01 02:48:26,287 INFO L226 Difference]: Without dead ends: 52 [2023-04-01 02:48:26,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=129, Invalid=1131, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 02:48:26,288 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 18 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 11 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:26,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 169 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 198 Invalid, 3 Unknown, 0 Unchecked, 2.0s Time] [2023-04-01 02:48:26,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-04-01 02:48:26,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 32. [2023-04-01 02:48:26,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:48:26,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2023-04-01 02:48:26,298 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 21 [2023-04-01 02:48:26,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:26,298 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2023-04-01 02:48:26,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 18 states have internal predecessors, (30), 6 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:48:26,299 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2023-04-01 02:48:26,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-04-01 02:48:26,299 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:26,299 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:26,307 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:26,505 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:26,505 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:26,506 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:26,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1910038712, now seen corresponding path program 2 times [2023-04-01 02:48:26,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:26,506 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335517160] [2023-04-01 02:48:26,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:26,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:26,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:26,871 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:26,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:26,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335517160] [2023-04-01 02:48:26,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335517160] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:26,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18481406] [2023-04-01 02:48:26,871 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:48:26,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:26,872 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:26,873 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:26,893 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-01 02:48:26,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 02:48:26,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:48:26,936 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-01 02:48:26,938 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:26,977 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 02:48:27,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2023-04-01 02:48:27,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 48 [2023-04-01 02:48:27,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:48:27,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2023-04-01 02:48:27,067 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-04-01 02:48:27,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 02:48:27,249 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:27,249 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:29,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2023-04-01 02:48:29,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 102 treesize of output 94 [2023-04-01 02:48:29,408 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 02:48:29,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18481406] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:29,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1282640297] [2023-04-01 02:48:29,411 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:48:29,411 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:29,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:29,411 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:29,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:29,438 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:29,626 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:48:29,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:29,691 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:30,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '902#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:30,440 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:30,440 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:30,440 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 11] total 26 [2023-04-01 02:48:30,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174373682] [2023-04-01 02:48:30,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:30,441 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-01 02:48:30,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:30,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-01 02:48:30,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1278, Unknown=1, NotChecked=0, Total=1406 [2023-04-01 02:48:30,443 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 26 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 7 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:48:31,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:31,180 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2023-04-01 02:48:31,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-01 02:48:31,181 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 7 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 22 [2023-04-01 02:48:31,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:31,183 INFO L225 Difference]: With dead ends: 48 [2023-04-01 02:48:31,183 INFO L226 Difference]: Without dead ends: 46 [2023-04-01 02:48:31,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=200, Invalid=1869, Unknown=1, NotChecked=0, Total=2070 [2023-04-01 02:48:31,184 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 21 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 26 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:31,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 142 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 204 Invalid, 1 Unknown, 0 Unchecked, 0.6s Time] [2023-04-01 02:48:31,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-01 02:48:31,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 31. [2023-04-01 02:48:31,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:48:31,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2023-04-01 02:48:31,192 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 22 [2023-04-01 02:48:31,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:31,192 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2023-04-01 02:48:31,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 7 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:48:31,193 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2023-04-01 02:48:31,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-04-01 02:48:31,193 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:31,193 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:31,218 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:31,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:31,403 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:31,403 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:31,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1545524492, now seen corresponding path program 3 times [2023-04-01 02:48:31,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:31,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730569546] [2023-04-01 02:48:31,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:31,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:31,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:31,515 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:31,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:31,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730569546] [2023-04-01 02:48:31,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730569546] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:31,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241315850] [2023-04-01 02:48:31,515 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 02:48:31,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:31,516 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:31,517 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:31,519 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-01 02:48:31,580 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 02:48:31,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:48:31,582 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 02:48:31,583 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:31,659 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:31,660 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:31,710 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:31,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241315850] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:31,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1344355953] [2023-04-01 02:48:31,712 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:48:31,712 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:31,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:31,712 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:31,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:31,739 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:31,922 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:48:31,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:31,975 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:32,437 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1227#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:32,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:32,438 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:32,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8] total 14 [2023-04-01 02:48:32,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938381583] [2023-04-01 02:48:32,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:32,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-01 02:48:32,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:32,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-01 02:48:32,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=560, Unknown=0, NotChecked=0, Total=650 [2023-04-01 02:48:32,440 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 7 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 02:48:32,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:32,533 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2023-04-01 02:48:32,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-01 02:48:32,534 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 7 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 28 [2023-04-01 02:48:32,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:32,537 INFO L225 Difference]: With dead ends: 60 [2023-04-01 02:48:32,537 INFO L226 Difference]: Without dead ends: 36 [2023-04-01 02:48:32,538 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 60 SyntacticMatches, 7 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2023-04-01 02:48:32,539 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 7 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:32,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 68 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 02:48:32,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-01 02:48:32,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2023-04-01 02:48:32,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 23 states have internal predecessors, (24), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-01 02:48:32,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2023-04-01 02:48:32,553 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 28 [2023-04-01 02:48:32,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:32,553 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2023-04-01 02:48:32,553 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 7 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 02:48:32,553 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2023-04-01 02:48:32,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-01 02:48:32,554 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:32,555 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:32,561 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:32,757 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:32,757 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:32,757 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:32,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1517893906, now seen corresponding path program 4 times [2023-04-01 02:48:32,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:32,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027816477] [2023-04-01 02:48:32,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:32,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:32,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:33,044 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:33,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:33,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027816477] [2023-04-01 02:48:33,044 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027816477] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:33,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1824920510] [2023-04-01 02:48:33,045 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 02:48:33,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:33,045 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:33,046 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) [2023-04-01 02:48:33,048 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-01 02:48:33,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:33,106 INFO L262 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-01 02:48:33,108 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:33,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 02:48:33,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 02:48:33,371 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:33,372 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:33,486 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-01 02:48:33,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-04-01 02:48:33,504 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:33,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1824920510] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:33,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [545954314] [2023-04-01 02:48:33,506 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:48:33,506 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:33,506 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:33,506 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:33,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:33,527 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:33,737 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:48:33,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:33,790 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:34,519 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1580#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:34,519 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:34,519 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:34,519 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12] total 28 [2023-04-01 02:48:34,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720146904] [2023-04-01 02:48:34,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:34,520 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-04-01 02:48:34,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:34,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-04-01 02:48:34,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1433, Unknown=0, NotChecked=0, Total=1560 [2023-04-01 02:48:34,522 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 28 states, 25 states have (on average 1.6) internal successors, (40), 26 states have internal predecessors, (40), 10 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 02:48:37,517 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 02:48:37,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:37,816 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2023-04-01 02:48:37,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-01 02:48:37,816 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 1.6) internal successors, (40), 26 states have internal predecessors, (40), 10 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 29 [2023-04-01 02:48:37,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:37,817 INFO L225 Difference]: With dead ends: 69 [2023-04-01 02:48:37,817 INFO L226 Difference]: Without dead ends: 67 [2023-04-01 02:48:37,818 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 52 SyntacticMatches, 8 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=203, Invalid=2053, Unknown=0, NotChecked=0, Total=2256 [2023-04-01 02:48:37,819 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 32 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 368 mSolverCounterSat, 18 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 368 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:37,819 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 223 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 368 Invalid, 4 Unknown, 0 Unchecked, 3.1s Time] [2023-04-01 02:48:37,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2023-04-01 02:48:37,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 40. [2023-04-01 02:48:37,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 02:48:37,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2023-04-01 02:48:37,827 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 29 [2023-04-01 02:48:37,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:37,828 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2023-04-01 02:48:37,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 1.6) internal successors, (40), 26 states have internal predecessors, (40), 10 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 02:48:37,828 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2023-04-01 02:48:37,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-01 02:48:37,829 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:37,829 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:37,837 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:38,034 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:38,035 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:38,035 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:38,035 INFO L85 PathProgramCache]: Analyzing trace with hash 1994583732, now seen corresponding path program 5 times [2023-04-01 02:48:38,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:38,035 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565200720] [2023-04-01 02:48:38,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:38,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:38,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:38,426 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:38,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:38,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565200720] [2023-04-01 02:48:38,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [565200720] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:38,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706550250] [2023-04-01 02:48:38,427 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:48:38,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:38,427 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:38,428 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) [2023-04-01 02:48:38,429 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-01 02:48:38,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-01 02:48:38,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:48:38,491 INFO L262 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-01 02:48:38,494 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:38,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 02:48:38,590 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2023-04-01 02:48:38,597 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 48 [2023-04-01 02:48:38,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:48:38,602 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2023-04-01 02:48:38,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-04-01 02:48:38,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-01 02:48:38,861 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:38,862 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:41,016 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2023-04-01 02:48:41,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 102 treesize of output 94 [2023-04-01 02:48:41,045 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 02:48:41,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706550250] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:41,046 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [886756630] [2023-04-01 02:48:41,047 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:48:41,047 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:41,047 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:41,048 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:41,048 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:41,067 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:41,235 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:48:41,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:41,275 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:42,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1978#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:42,059 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:42,059 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:42,059 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 13] total 31 [2023-04-01 02:48:42,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293094816] [2023-04-01 02:48:42,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:42,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-04-01 02:48:42,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:42,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-04-01 02:48:42,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1659, Unknown=1, NotChecked=0, Total=1806 [2023-04-01 02:48:42,062 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 29 states have internal predecessors, (43), 10 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 02:48:43,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:43,396 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2023-04-01 02:48:43,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 02:48:43,397 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 29 states have internal predecessors, (43), 10 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 30 [2023-04-01 02:48:43,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:43,397 INFO L225 Difference]: With dead ends: 59 [2023-04-01 02:48:43,397 INFO L226 Difference]: Without dead ends: 57 [2023-04-01 02:48:43,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=232, Invalid=2419, Unknown=1, NotChecked=0, Total=2652 [2023-04-01 02:48:43,399 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 22 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 389 mSolverCounterSat, 30 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 389 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:43,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 179 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 389 Invalid, 2 Unknown, 0 Unchecked, 1.2s Time] [2023-04-01 02:48:43,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-04-01 02:48:43,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 49. [2023-04-01 02:48:43,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 34 states have (on average 1.088235294117647) internal successors, (37), 36 states have internal predecessors, (37), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 02:48:43,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2023-04-01 02:48:43,408 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 30 [2023-04-01 02:48:43,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:43,409 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2023-04-01 02:48:43,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 29 states have internal predecessors, (43), 10 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-01 02:48:43,409 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2023-04-01 02:48:43,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-01 02:48:43,410 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:43,410 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:43,415 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:43,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:43,611 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:43,611 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:43,611 INFO L85 PathProgramCache]: Analyzing trace with hash 1660315656, now seen corresponding path program 6 times [2023-04-01 02:48:43,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:43,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411845209] [2023-04-01 02:48:43,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:43,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:43,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:43,714 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:43,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:43,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411845209] [2023-04-01 02:48:43,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411845209] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:43,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684100415] [2023-04-01 02:48:43,715 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 02:48:43,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:43,715 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:43,717 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) [2023-04-01 02:48:43,740 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-01 02:48:43,795 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 02:48:43,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:48:43,796 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-01 02:48:43,798 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:43,933 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:43,933 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:44,009 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:44,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684100415] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:44,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [675474488] [2023-04-01 02:48:44,011 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:48:44,011 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:44,011 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:44,011 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:44,011 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:44,035 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:44,213 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:48:44,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:44,252 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:44,751 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2401#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:44,751 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:44,751 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:44,751 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10] total 17 [2023-04-01 02:48:44,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125615757] [2023-04-01 02:48:44,752 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:44,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-01 02:48:44,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:44,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-01 02:48:44,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2023-04-01 02:48:44,753 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 9 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-01 02:48:44,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:44,892 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2023-04-01 02:48:44,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-01 02:48:44,893 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 9 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 36 [2023-04-01 02:48:44,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:44,893 INFO L225 Difference]: With dead ends: 75 [2023-04-01 02:48:44,893 INFO L226 Difference]: Without dead ends: 44 [2023-04-01 02:48:44,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 80 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=145, Invalid=847, Unknown=0, NotChecked=0, Total=992 [2023-04-01 02:48:44,897 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 8 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:44,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 72 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 02:48:44,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-04-01 02:48:44,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2023-04-01 02:48:44,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 02:48:44,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2023-04-01 02:48:44,913 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 36 [2023-04-01 02:48:44,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:44,913 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2023-04-01 02:48:44,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 9 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-04-01 02:48:44,913 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2023-04-01 02:48:44,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-01 02:48:44,920 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:44,920 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:44,929 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:45,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-01 02:48:45,129 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:45,129 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:45,130 INFO L85 PathProgramCache]: Analyzing trace with hash 530937894, now seen corresponding path program 7 times [2023-04-01 02:48:45,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:45,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368851977] [2023-04-01 02:48:45,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:45,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:45,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:45,485 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:45,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:45,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368851977] [2023-04-01 02:48:45,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368851977] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:45,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135132786] [2023-04-01 02:48:45,486 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 02:48:45,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:45,486 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:45,487 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:45,498 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-01 02:48:45,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:45,558 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 28 conjunts are in the unsatisfiable core [2023-04-01 02:48:45,559 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:45,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 02:48:45,744 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 02:48:45,746 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 02:48:45,746 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 10 [2023-04-01 02:48:45,798 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:45,798 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:45,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2023-04-01 02:48:45,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-04-01 02:48:45,977 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:45,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135132786] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:45,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606973416] [2023-04-01 02:48:45,980 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:48:45,980 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:45,980 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:45,981 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:45,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:46,000 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:46,163 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:48:46,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:46,208 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:46,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2837#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:46,907 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:46,907 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:46,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 14] total 27 [2023-04-01 02:48:46,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893859159] [2023-04-01 02:48:46,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:46,907 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-04-01 02:48:46,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:46,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-04-01 02:48:46,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1358, Unknown=0, NotChecked=0, Total=1482 [2023-04-01 02:48:46,909 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 27 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 9 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-01 02:48:51,119 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 02:48:51,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:48:51,986 INFO L93 Difference]: Finished difference Result 84 states and 87 transitions. [2023-04-01 02:48:51,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-04-01 02:48:51,986 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 9 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) Word has length 37 [2023-04-01 02:48:51,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:48:51,987 INFO L225 Difference]: With dead ends: 84 [2023-04-01 02:48:51,987 INFO L226 Difference]: Without dead ends: 82 [2023-04-01 02:48:51,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 74 SyntacticMatches, 13 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=153, Invalid=1653, Unknown=0, NotChecked=0, Total=1806 [2023-04-01 02:48:51,988 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 13 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2023-04-01 02:48:51,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 233 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 458 Invalid, 5 Unknown, 0 Unchecked, 5.0s Time] [2023-04-01 02:48:51,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-04-01 02:48:51,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 48. [2023-04-01 02:48:51,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.088235294117647) internal successors, (37), 35 states have internal predecessors, (37), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-01 02:48:51,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2023-04-01 02:48:51,998 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 37 [2023-04-01 02:48:51,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:48:51,998 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2023-04-01 02:48:51,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 9 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-01 02:48:51,998 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2023-04-01 02:48:51,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-04-01 02:48:51,999 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:48:51,999 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:48:52,010 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-01 02:48:52,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-01 02:48:52,205 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:48:52,205 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:48:52,205 INFO L85 PathProgramCache]: Analyzing trace with hash -120034360, now seen corresponding path program 8 times [2023-04-01 02:48:52,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:48:52,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207540753] [2023-04-01 02:48:52,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:48:52,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:48:52,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:48:52,702 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:52,702 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:48:52,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207540753] [2023-04-01 02:48:52,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207540753] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:48:52,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422696530] [2023-04-01 02:48:52,703 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:48:52,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:48:52,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:48:52,704 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:48:52,707 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-01 02:48:52,791 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-01 02:48:52,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:48:52,792 INFO L262 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 35 conjunts are in the unsatisfiable core [2023-04-01 02:48:52,794 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:48:52,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-01 02:48:52,876 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 12 [2023-04-01 02:48:52,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 42 [2023-04-01 02:48:52,890 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 18 [2023-04-01 02:48:52,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-04-01 02:48:53,089 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 02:48:53,091 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 02:48:53,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 10 [2023-04-01 02:48:53,138 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:53,138 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:48:55,278 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 22 [2023-04-01 02:48:55,280 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 42 [2023-04-01 02:48:55,344 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:48:55,344 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422696530] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:48:55,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [338896934] [2023-04-01 02:48:55,346 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:48:55,346 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:48:55,346 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:48:55,346 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:48:55,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:48:55,366 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:48:55,516 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:48:55,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:48:55,573 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:48:56,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3309#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:48:56,308 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:48:56,308 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:48:56,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 15] total 31 [2023-04-01 02:48:56,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713598993] [2023-04-01 02:48:56,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:48:56,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-04-01 02:48:56,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:48:56,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-04-01 02:48:56,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1649, Unknown=1, NotChecked=0, Total=1806 [2023-04-01 02:48:56,310 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 31 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 29 states have internal predecessors, (45), 9 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-01 02:49:01,103 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-04-01 02:49:04,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:49:04,046 INFO L93 Difference]: Finished difference Result 114 states and 124 transitions. [2023-04-01 02:49:04,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-04-01 02:49:04,047 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 29 states have internal predecessors, (45), 9 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) Word has length 38 [2023-04-01 02:49:04,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:49:04,048 INFO L225 Difference]: With dead ends: 114 [2023-04-01 02:49:04,048 INFO L226 Difference]: Without dead ends: 112 [2023-04-01 02:49:04,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 73 SyntacticMatches, 14 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 986 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=253, Invalid=2715, Unknown=2, NotChecked=0, Total=2970 [2023-04-01 02:49:04,050 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 31 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 50 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2023-04-01 02:49:04,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 196 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 507 Invalid, 6 Unknown, 0 Unchecked, 5.5s Time] [2023-04-01 02:49:04,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-04-01 02:49:04,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 68. [2023-04-01 02:49:04,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 51 states have internal predecessors, (53), 11 states have call successors, (11), 9 states have call predecessors, (11), 8 states have return successors, (10), 7 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 02:49:04,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2023-04-01 02:49:04,067 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 38 [2023-04-01 02:49:04,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:49:04,067 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2023-04-01 02:49:04,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 29 states have internal predecessors, (45), 9 states have call successors, (13), 4 states have call predecessors, (13), 2 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-01 02:49:04,067 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2023-04-01 02:49:04,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-01 02:49:04,068 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:49:04,068 INFO L195 NwaCegarLoop]: trace histogram [7, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:49:04,073 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-01 02:49:04,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-01 02:49:04,273 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:49:04,273 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:49:04,273 INFO L85 PathProgramCache]: Analyzing trace with hash -1639415928, now seen corresponding path program 9 times [2023-04-01 02:49:04,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:49:04,274 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534415546] [2023-04-01 02:49:04,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:49:04,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:49:04,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:49:04,940 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 43 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:49:04,940 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:49:04,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534415546] [2023-04-01 02:49:04,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534415546] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:49:04,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131682688] [2023-04-01 02:49:04,941 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-01 02:49:04,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:49:04,941 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:49:04,942 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:49:04,945 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-01 02:49:05,128 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-01 02:49:05,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:49:05,130 INFO L262 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 52 conjunts are in the unsatisfiable core [2023-04-01 02:49:05,134 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:49:05,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-01 02:49:05,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:49:05,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:49:05,215 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 72 [2023-04-01 02:49:05,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 9 [2023-04-01 02:49:05,235 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-04-01 02:49:05,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-01 02:49:05,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:49:05,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:49:05,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 72 [2023-04-01 02:49:05,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 9 [2023-04-01 02:49:05,306 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-04-01 02:49:05,320 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-01 02:49:05,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2023-04-01 02:49:05,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 48 [2023-04-01 02:49:05,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-01 02:49:05,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2023-04-01 02:49:05,410 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 5 [2023-04-01 02:49:05,699 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-01 02:49:05,701 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-01 02:49:05,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 10 [2023-04-01 02:49:05,760 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 49 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 02:49:05,761 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:49:08,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 53 [2023-04-01 02:49:08,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53494 treesize of output 53238 [2023-04-01 02:49:08,220 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 43 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 02:49:08,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131682688] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:49:08,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [617447221] [2023-04-01 02:49:08,222 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:49:08,222 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:49:08,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:49:08,222 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:49:08,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:49:08,247 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:49:08,405 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:49:08,452 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:49:08,456 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:49:09,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3897#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:49:09,346 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:49:09,346 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:49:09,346 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 20, 17] total 39 [2023-04-01 02:49:09,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798853109] [2023-04-01 02:49:09,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:49:09,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-04-01 02:49:09,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:49:09,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-04-01 02:49:09,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=2351, Unknown=1, NotChecked=0, Total=2550 [2023-04-01 02:49:09,348 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 39 states, 37 states have (on average 1.4594594594594594) internal successors, (54), 37 states have internal predecessors, (54), 9 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-01 02:49:12,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:49:12,715 INFO L93 Difference]: Finished difference Result 98 states and 108 transitions. [2023-04-01 02:49:12,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-04-01 02:49:12,716 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 1.4594594594594594) internal successors, (54), 37 states have internal predecessors, (54), 9 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) Word has length 40 [2023-04-01 02:49:12,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:49:12,717 INFO L225 Difference]: With dead ends: 98 [2023-04-01 02:49:12,717 INFO L226 Difference]: Without dead ends: 96 [2023-04-01 02:49:12,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 75 SyntacticMatches, 12 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1499 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=498, Invalid=4903, Unknown=1, NotChecked=0, Total=5402 [2023-04-01 02:49:12,718 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 39 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 1299 mSolverCounterSat, 68 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 1370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 1299 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-04-01 02:49:12,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 225 Invalid, 1370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 1299 Invalid, 3 Unknown, 0 Unchecked, 2.7s Time] [2023-04-01 02:49:12,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-04-01 02:49:12,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 78. [2023-04-01 02:49:12,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 58 states have internal predecessors, (60), 13 states have call successors, (13), 10 states have call predecessors, (13), 9 states have return successors, (12), 9 states have call predecessors, (12), 12 states have call successors, (12) [2023-04-01 02:49:12,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2023-04-01 02:49:12,735 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 40 [2023-04-01 02:49:12,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:49:12,735 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2023-04-01 02:49:12,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 1.4594594594594594) internal successors, (54), 37 states have internal predecessors, (54), 9 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-04-01 02:49:12,736 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2023-04-01 02:49:12,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-01 02:49:12,736 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:49:12,736 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:49:12,742 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-01 02:49:12,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-01 02:49:12,940 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:49:12,940 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:49:12,941 INFO L85 PathProgramCache]: Analyzing trace with hash 1005374068, now seen corresponding path program 10 times [2023-04-01 02:49:12,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:49:12,941 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311450774] [2023-04-01 02:49:12,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:49:12,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:49:12,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:49:13,076 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 24 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 02:49:13,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:49:13,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311450774] [2023-04-01 02:49:13,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311450774] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:49:13,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092123649] [2023-04-01 02:49:13,077 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-01 02:49:13,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:49:13,077 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:49:13,078 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:49:13,081 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-01 02:49:13,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:49:13,160 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-01 02:49:13,162 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:49:13,296 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 34 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 02:49:13,297 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:49:13,379 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 34 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 02:49:13,379 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092123649] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 02:49:13,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [413590999] [2023-04-01 02:49:13,381 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:49:13,381 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:49:13,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:49:13,382 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:49:13,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:49:13,402 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:49:13,573 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:49:13,620 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:49:13,624 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:49:14,299 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4505#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:49:14,299 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:49:14,299 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 02:49:14,299 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12] total 20 [2023-04-01 02:49:14,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684614343] [2023-04-01 02:49:14,299 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 02:49:14,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-01 02:49:14,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:49:14,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-01 02:49:14,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=854, Unknown=0, NotChecked=0, Total=992 [2023-04-01 02:49:14,302 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 02:49:14,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:49:14,455 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2023-04-01 02:49:14,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-01 02:49:14,455 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 44 [2023-04-01 02:49:14,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:49:14,458 INFO L225 Difference]: With dead ends: 108 [2023-04-01 02:49:14,458 INFO L226 Difference]: Without dead ends: 70 [2023-04-01 02:49:14,459 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 100 SyntacticMatches, 13 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 618 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=188, Invalid=1072, Unknown=0, NotChecked=0, Total=1260 [2023-04-01 02:49:14,459 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 11 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-01 02:49:14,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 82 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-01 02:49:14,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-04-01 02:49:14,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2023-04-01 02:49:14,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 49 states have internal predecessors, (51), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 02:49:14,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2023-04-01 02:49:14,474 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 44 [2023-04-01 02:49:14,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:49:14,474 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2023-04-01 02:49:14,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 20 states have internal predecessors, (41), 11 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-01 02:49:14,475 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2023-04-01 02:49:14,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-01 02:49:14,475 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:49:14,475 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:49:14,483 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-01 02:49:14,681 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-01 02:49:14,681 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:49:14,682 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:49:14,682 INFO L85 PathProgramCache]: Analyzing trace with hash -2137989998, now seen corresponding path program 11 times [2023-04-01 02:49:14,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:49:14,682 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18334711] [2023-04-01 02:49:14,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:49:14,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:49:14,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 02:49:15,164 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 02:49:15,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 02:49:15,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18334711] [2023-04-01 02:49:15,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18334711] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:49:15,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534292953] [2023-04-01 02:49:15,165 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-01 02:49:15,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 02:49:15,165 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 02:49:15,169 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 02:49:15,171 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-01 02:49:15,326 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-01 02:49:15,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-01 02:49:15,328 INFO L262 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 23 conjunts are in the unsatisfiable core [2023-04-01 02:49:15,329 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 02:49:15,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-04-01 02:49:16,114 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-04-01 02:49:16,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 10 [2023-04-01 02:49:16,187 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-01 02:49:16,187 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 02:49:16,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534292953] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 02:49:16,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [730464251] [2023-04-01 02:49:16,287 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 02:49:16,288 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 02:49:16,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 02:49:16,288 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 02:49:16,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 02:49:16,316 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2023-04-01 02:49:16,465 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 54 for LOIs [2023-04-01 02:49:16,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2023-04-01 02:49:16,503 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 02:49:17,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4973#(and (<= 1 |#StackHeapBarrier|) (= ~MAX~0 100000) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~SIZE~0 99999) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-01 02:49:17,443 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-01 02:49:17,443 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-01 02:49:17,443 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 31 [2023-04-01 02:49:17,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028386099] [2023-04-01 02:49:17,444 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-01 02:49:17,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-04-01 02:49:17,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 02:49:17,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-04-01 02:49:17,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1821, Unknown=0, NotChecked=0, Total=1980 [2023-04-01 02:49:17,445 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 31 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 29 states have internal predecessors, (45), 11 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 02:49:18,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 02:49:18,313 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2023-04-01 02:49:18,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-04-01 02:49:18,313 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 29 states have internal predecessors, (45), 11 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 45 [2023-04-01 02:49:18,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 02:49:18,314 INFO L225 Difference]: With dead ends: 108 [2023-04-01 02:49:18,314 INFO L226 Difference]: Without dead ends: 70 [2023-04-01 02:49:18,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 57 SyntacticMatches, 12 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 845 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=320, Invalid=3220, Unknown=0, NotChecked=0, Total=3540 [2023-04-01 02:49:18,316 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 47 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 483 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-01 02:49:18,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 153 Invalid, 533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 483 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-01 02:49:18,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-04-01 02:49:18,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2023-04-01 02:49:18,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 49 states have internal predecessors, (50), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 02:49:18,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 69 transitions. [2023-04-01 02:49:18,336 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 69 transitions. Word has length 45 [2023-04-01 02:49:18,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 02:49:18,336 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 69 transitions. [2023-04-01 02:49:18,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 1.5517241379310345) internal successors, (45), 29 states have internal predecessors, (45), 11 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-04-01 02:49:18,336 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 69 transitions. [2023-04-01 02:49:18,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-01 02:49:18,337 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 02:49:18,337 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 02:49:18,343 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-01 02:49:18,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-01 02:49:18,543 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 02:49:18,543 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 02:49:18,543 INFO L85 PathProgramCache]: Analyzing trace with hash -798028236, now seen corresponding path program 12 times [2023-04-01 02:49:18,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 02:49:18,543 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140002833] [2023-04-01 02:49:18,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 02:49:18,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 02:49:18,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat