/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain IntervalDomain -i ../sv-benchmarks/c/array-fpi/ncomp.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 21:01:42,380 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 21:01:42,382 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 21:01:42,412 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 21:01:42,412 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 21:01:42,413 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 21:01:42,414 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 21:01:42,415 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 21:01:42,416 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 21:01:42,417 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 21:01:42,418 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 21:01:42,418 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 21:01:42,419 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 21:01:42,419 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 21:01:42,420 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 21:01:42,421 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 21:01:42,421 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 21:01:42,422 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 21:01:42,423 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 21:01:42,424 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 21:01:42,425 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 21:01:42,429 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 21:01:42,433 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 21:01:42,434 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 21:01:42,436 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 21:01:42,438 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 21:01:42,438 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 21:01:42,439 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 21:01:42,439 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 21:01:42,440 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 21:01:42,440 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 21:01:42,440 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 21:01:42,440 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 21:01:42,441 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 21:01:42,441 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 21:01:42,441 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 21:01:42,446 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-03-31 21:01:42,473 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 21:01:42,473 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 21:01:42,473 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 21:01:42,473 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 21:01:42,474 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 21:01:42,474 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 21:01:42,474 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 21:01:42,474 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 21:01:42,474 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 21:01:42,475 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 21:01:42,475 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 21:01:42,475 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 21:01:42,475 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 21:01:42,475 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 21:01:42,475 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 21:01:42,476 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 21:01:42,476 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 21:01:42,476 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 21:01:42,476 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 21:01:42,476 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 21:01:42,476 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 21:01:42,476 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 21:01:42,476 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 21:01:42,476 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 21:01:42,477 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 21:01:42,477 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 21:01:42,477 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 21:01:42,477 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 21:01:42,477 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 21:01:42,477 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 21:01:42,477 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 21:01:42,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 21:01:42,478 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 21:01:42,682 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 21:01:42,697 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 21:01:42,699 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 21:01:42,700 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 21:01:42,701 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 21:01:42,702 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/ncomp.c [2023-03-31 21:01:43,738 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 21:01:43,894 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 21:01:43,894 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ncomp.c [2023-03-31 21:01:43,899 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/599a6f769/07a8039a7b1346dc81e7c2c19424ddf3/FLAG637d0ffcb [2023-03-31 21:01:43,914 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/599a6f769/07a8039a7b1346dc81e7c2c19424ddf3 [2023-03-31 21:01:43,917 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 21:01:43,918 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 21:01:43,921 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 21:01:43,921 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 21:01:43,923 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 21:01:43,924 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 09:01:43" (1/1) ... [2023-03-31 21:01:43,925 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d2d58a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:43, skipping insertion in model container [2023-03-31 21:01:43,925 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 09:01:43" (1/1) ... [2023-03-31 21:01:43,930 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 21:01:43,943 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 21:01:44,060 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-fpi/ncomp.c[588,601] [2023-03-31 21:01:44,079 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 21:01:44,086 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 21:01:44,094 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-fpi/ncomp.c[588,601] [2023-03-31 21:01:44,099 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 21:01:44,108 INFO L208 MainTranslator]: Completed translation [2023-03-31 21:01:44,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44 WrapperNode [2023-03-31 21:01:44,109 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 21:01:44,110 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 21:01:44,110 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 21:01:44,110 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 21:01:44,117 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,117 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,122 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,122 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,127 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,130 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,131 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,133 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 21:01:44,134 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 21:01:44,134 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 21:01:44,134 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 21:01:44,135 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (1/1) ... [2023-03-31 21:01:44,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 21:01:44,150 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:01:44,159 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-03-31 21:01:44,161 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-03-31 21:01:44,191 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 21:01:44,192 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 21:01:44,192 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 21:01:44,193 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-03-31 21:01:44,193 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 21:01:44,193 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 21:01:44,193 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 21:01:44,193 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 21:01:44,193 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 21:01:44,194 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 21:01:44,194 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-03-31 21:01:44,194 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 21:01:44,194 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 21:01:44,194 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-03-31 21:01:44,194 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 21:01:44,194 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-03-31 21:01:44,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 21:01:44,195 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 21:01:44,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 21:01:44,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 21:01:44,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 21:01:44,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 21:01:44,245 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 21:01:44,247 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 21:01:44,466 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 21:01:44,510 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 21:01:44,510 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-03-31 21:01:44,513 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 09:01:44 BoogieIcfgContainer [2023-03-31 21:01:44,513 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 21:01:44,521 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 21:01:44,521 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 21:01:44,524 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 21:01:44,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 09:01:43" (1/3) ... [2023-03-31 21:01:44,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57faab24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 09:01:44, skipping insertion in model container [2023-03-31 21:01:44,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:01:44" (2/3) ... [2023-03-31 21:01:44,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57faab24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 09:01:44, skipping insertion in model container [2023-03-31 21:01:44,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 09:01:44" (3/3) ... [2023-03-31 21:01:44,526 INFO L112 eAbstractionObserver]: Analyzing ICFG ncomp.c [2023-03-31 21:01:44,538 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 21:01:44,538 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 21:01:44,583 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 21:01:44,589 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;@191ae2ab, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 21:01:44,589 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 21:01:44,593 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 21:01:44,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-03-31 21:01:44,600 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:01:44,601 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:01:44,601 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:01:44,607 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:01:44,607 INFO L85 PathProgramCache]: Analyzing trace with hash 481871357, now seen corresponding path program 1 times [2023-03-31 21:01:44,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:01:44,614 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587187806] [2023-03-31 21:01:44,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:44,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:01:44,749 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:01:44,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1617831098] [2023-03-31 21:01:44,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:44,750 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:44,750 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:01:44,759 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:01:44,762 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 21:01:44,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:01:44,903 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 19 conjunts are in the unsatisfiable core [2023-03-31 21:01:44,908 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:01:45,107 INFO L321 Elim1Store]: treesize reduction 117, result has 35.4 percent of original size [2023-03-31 21:01:45,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 194 treesize of output 281 [2023-03-31 21:01:45,172 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:45,197 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:45,214 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:45,546 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 5 treesize of output 3 [2023-03-31 21:01:45,765 INFO L321 Elim1Store]: treesize reduction 82, result has 37.4 percent of original size [2023-03-31 21:01:45,765 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 248 treesize of output 297 [2023-03-31 21:01:45,933 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 5 treesize of output 3 [2023-03-31 21:01:46,081 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2023-03-31 21:01:46,081 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 147 treesize of output 119 [2023-03-31 21:01:46,113 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 11 treesize of output 7 [2023-03-31 21:01:46,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:01:46,148 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 21:01:46,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:01:46,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587187806] [2023-03-31 21:01:46,149 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:01:46,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617831098] [2023-03-31 21:01:46,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1617831098] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:01:46,150 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:01:46,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-03-31 21:01:46,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398942157] [2023-03-31 21:01:46,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:01:46,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-03-31 21:01:46,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:01:46,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-03-31 21:01:46,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2023-03-31 21:01:46,182 INFO L87 Difference]: Start difference. First operand has 26 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:46,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:01:46,390 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2023-03-31 21:01:46,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-03-31 21:01:46,391 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2023-03-31 21:01:46,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:01:46,396 INFO L225 Difference]: With dead ends: 55 [2023-03-31 21:01:46,396 INFO L226 Difference]: Without dead ends: 32 [2023-03-31 21:01:46,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-03-31 21:01:46,400 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 38 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 5 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 21:01:46,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 84 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 127 Invalid, 2 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 21:01:46,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-03-31 21:01:46,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2023-03-31 21:01:46,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 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) [2023-03-31 21:01:46,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2023-03-31 21:01:46,428 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 18 [2023-03-31 21:01:46,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:01:46,428 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2023-03-31 21:01:46,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:46,429 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2023-03-31 21:01:46,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-03-31 21:01:46,429 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:01:46,430 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:01:46,438 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 21:01:46,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-03-31 21:01:46,636 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:01:46,636 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:01:46,636 INFO L85 PathProgramCache]: Analyzing trace with hash -537464292, now seen corresponding path program 1 times [2023-03-31 21:01:46,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:01:46,637 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288872002] [2023-03-31 21:01:46,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:46,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:01:46,672 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:01:46,673 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1784931673] [2023-03-31 21:01:46,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:46,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:46,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:01:46,674 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:01:46,676 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 21:01:46,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:01:46,728 INFO L262 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 21:01:46,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:01:46,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:01:46,748 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:01:46,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:01:46,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:01:46,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288872002] [2023-03-31 21:01:46,776 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:01:46,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784931673] [2023-03-31 21:01:46,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784931673] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:01:46,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [452559935] [2023-03-31 21:01:46,793 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-03-31 21:01:46,793 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:01:46,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:01:46,802 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:01:46,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:01:46,882 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:01:47,015 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2023-03-31 21:01:47,024 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:01:47,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:01:47,035 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:01:47,462 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '337#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~N~0 1) (= |#NULL.offset| 0) (< 0 ~N~0) (exists ((v_main_~c~0.base_BEFORE_CALL_1 Int)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_1) 0) ~N~0))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:01:47,463 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:01:47,463 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:01:47,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2023-03-31 21:01:47,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235173161] [2023-03-31 21:01:47,463 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:01:47,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-03-31 21:01:47,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:01:47,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-03-31 21:01:47,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2023-03-31 21:01:47,465 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:47,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:01:47,582 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2023-03-31 21:01:47,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-03-31 21:01:47,582 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-03-31 21:01:47,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:01:47,585 INFO L225 Difference]: With dead ends: 55 [2023-03-31 21:01:47,585 INFO L226 Difference]: Without dead ends: 45 [2023-03-31 21:01:47,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=565, Unknown=0, NotChecked=0, Total=650 [2023-03-31 21:01:47,586 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 10 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 21:01:47,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 71 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 21:01:47,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-03-31 21:01:47,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2023-03-31 21:01:47,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 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) [2023-03-31 21:01:47,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2023-03-31 21:01:47,598 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 19 [2023-03-31 21:01:47,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:01:47,598 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2023-03-31 21:01:47,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:47,598 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2023-03-31 21:01:47,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-03-31 21:01:47,600 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:01:47,600 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:01:47,607 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-03-31 21:01:47,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-03-31 21:01:47,801 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:01:47,801 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:01:47,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1341725683, now seen corresponding path program 1 times [2023-03-31 21:01:47,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:01:47,802 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508095556] [2023-03-31 21:01:47,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:47,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:01:47,831 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:01:47,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1422180789] [2023-03-31 21:01:47,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:47,838 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:47,838 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:01:47,839 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:01:47,842 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-03-31 21:01:47,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:01:47,900 INFO L262 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 21:01:47,901 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:01:47,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:01:47,915 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 21:01:47,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:01:47,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508095556] [2023-03-31 21:01:47,915 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:01:47,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422180789] [2023-03-31 21:01:47,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422180789] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:01:47,916 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:01:47,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:01:47,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850251045] [2023-03-31 21:01:47,916 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:01:47,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:01:47,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:01:47,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:01:47,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:01:47,917 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:47,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:01:47,980 INFO L93 Difference]: Finished difference Result 57 states and 66 transitions. [2023-03-31 21:01:47,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 21:01:47,981 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-03-31 21:01:47,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:01:47,981 INFO L225 Difference]: With dead ends: 57 [2023-03-31 21:01:47,981 INFO L226 Difference]: Without dead ends: 45 [2023-03-31 21:01:47,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-03-31 21:01:47,982 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 14 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 21:01:47,983 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 50 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 21:01:47,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-03-31 21:01:47,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2023-03-31 21:01:47,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 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) [2023-03-31 21:01:47,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2023-03-31 21:01:47,989 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 19 [2023-03-31 21:01:47,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:01:47,990 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2023-03-31 21:01:47,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:47,990 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2023-03-31 21:01:47,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-03-31 21:01:47,990 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:01:47,990 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:01:48,005 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-03-31 21:01:48,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:48,196 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:01:48,197 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:01:48,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1933725242, now seen corresponding path program 1 times [2023-03-31 21:01:48,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:01:48,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770266350] [2023-03-31 21:01:48,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:48,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:01:48,235 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:01:48,236 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [905649402] [2023-03-31 21:01:48,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:48,236 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:48,236 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:01:48,237 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:01:48,239 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-03-31 21:01:48,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:01:48,338 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 34 conjunts are in the unsatisfiable core [2023-03-31 21:01:48,341 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:01:48,434 INFO L321 Elim1Store]: treesize reduction 117, result has 35.4 percent of original size [2023-03-31 21:01:48,434 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 92 treesize of output 229 [2023-03-31 21:01:48,444 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:48,456 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:48,468 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:48,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:01:48,811 INFO L321 Elim1Store]: treesize reduction 79, result has 27.5 percent of original size [2023-03-31 21:01:48,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 260 treesize of output 304 [2023-03-31 21:01:48,823 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 145 treesize of output 143 [2023-03-31 21:01:48,915 INFO L321 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2023-03-31 21:01:48,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 115 treesize of output 16 [2023-03-31 21:01:48,954 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 5 treesize of output 3 [2023-03-31 21:01:48,988 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:48,988 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:48,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 134 [2023-03-31 21:01:49,011 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 5 treesize of output 3 [2023-03-31 21:01:49,035 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 14 treesize of output 12 [2023-03-31 21:01:49,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-03-31 21:01:49,072 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 [2023-03-31 21:01:49,098 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 21 treesize of output 20 [2023-03-31 21:01:49,119 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 [2023-03-31 21:01:49,147 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:01:49,147 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:01:51,280 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_220 (Array Int Int))) (= c_~N~0 (select (select (store |c_#memory_int| c_main_~b~0.base v_ArrVal_220) c_main_~c~0.base) c_main_~c~0.offset))) is different from false [2023-03-31 21:01:51,324 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:51,325 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:51,354 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-03-31 21:01:51,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:01:51,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770266350] [2023-03-31 21:01:51,355 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:01:51,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905649402] [2023-03-31 21:01:51,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [905649402] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:01:51,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1067442897] [2023-03-31 21:01:51,357 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-03-31 21:01:51,357 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:01:51,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:01:51,357 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:01:51,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:01:51,402 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:01:51,578 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 21:01:51,586 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:01:51,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:01:51,599 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:01:52,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '844#(and (<= ~N~0 2147483647) (exists ((v_main_~c~0.base_BEFORE_CALL_2 Int)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_2) 0) ~N~0))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (< 0 ~N~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:01:52,097 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:01:52,097 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:01:52,097 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2023-03-31 21:01:52,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368033322] [2023-03-31 21:01:52,098 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:01:52,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-03-31 21:01:52,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:01:52,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-03-31 21:01:52,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1011, Unknown=6, NotChecked=64, Total=1190 [2023-03-31 21:01:52,099 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 20 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 21:01:52,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:01:52,469 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2023-03-31 21:01:52,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 21:01:52,469 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 21 [2023-03-31 21:01:52,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:01:52,470 INFO L225 Difference]: With dead ends: 55 [2023-03-31 21:01:52,470 INFO L226 Difference]: Without dead ends: 53 [2023-03-31 21:01:52,470 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=170, Invalid=1468, Unknown=6, NotChecked=78, Total=1722 [2023-03-31 21:01:52,471 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 70 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 21:01:52,471 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 76 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 217 Invalid, 0 Unknown, 51 Unchecked, 0.2s Time] [2023-03-31 21:01:52,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-03-31 21:01:52,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 35. [2023-03-31 21:01:52,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 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) [2023-03-31 21:01:52,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2023-03-31 21:01:52,478 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 21 [2023-03-31 21:01:52,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:01:52,478 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2023-03-31 21:01:52,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 21:01:52,479 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2023-03-31 21:01:52,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-03-31 21:01:52,479 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:01:52,479 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:01:52,487 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 21:01:52,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:52,685 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:01:52,685 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:01:52,686 INFO L85 PathProgramCache]: Analyzing trace with hash 121414214, now seen corresponding path program 2 times [2023-03-31 21:01:52,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:01:52,686 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345098229] [2023-03-31 21:01:52,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:52,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:01:52,707 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:01:52,707 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1230728327] [2023-03-31 21:01:52,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 21:01:52,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:52,708 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:01:52,709 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:01:52,711 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-03-31 21:01:52,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 21:01:52,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 21:01:52,890 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 21:01:52,891 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:01:52,922 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 21:01:52,922 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:01:52,951 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 21:01:52,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:01:52,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345098229] [2023-03-31 21:01:52,951 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:01:52,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230728327] [2023-03-31 21:01:52,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230728327] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:01:52,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [514850219] [2023-03-31 21:01:52,956 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-03-31 21:01:52,956 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:01:52,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:01:52,956 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:01:52,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:01:52,984 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:01:53,126 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 21:01:53,131 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:01:53,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:01:53,139 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:01:53,501 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1165#(and (<= ~N~0 2147483647) (exists ((v_main_~c~0.base_BEFORE_CALL_3 Int)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_3) 0) ~N~0))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (< 0 ~N~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:01:53,501 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:01:53,501 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:01:53,501 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-03-31 21:01:53,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031052049] [2023-03-31 21:01:53,502 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:01:53,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-03-31 21:01:53,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:01:53,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-03-31 21:01:53,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2023-03-31 21:01:53,503 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:53,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:01:53,676 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2023-03-31 21:01:53,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-03-31 21:01:53,676 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 23 [2023-03-31 21:01:53,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:01:53,677 INFO L225 Difference]: With dead ends: 86 [2023-03-31 21:01:53,677 INFO L226 Difference]: Without dead ends: 60 [2023-03-31 21:01:53,678 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2023-03-31 21:01:53,678 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 21 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 21:01:53,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 64 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 21:01:53,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-03-31 21:01:53,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 39. [2023-03-31 21:01:53,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 30 states have internal predecessors, (37), 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) [2023-03-31 21:01:53,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2023-03-31 21:01:53,686 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 23 [2023-03-31 21:01:53,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:01:53,686 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2023-03-31 21:01:53,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:53,686 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2023-03-31 21:01:53,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-03-31 21:01:53,686 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:01:53,686 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:01:53,703 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-03-31 21:01:53,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:53,893 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:01:53,893 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:01:53,893 INFO L85 PathProgramCache]: Analyzing trace with hash 484781011, now seen corresponding path program 3 times [2023-03-31 21:01:53,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:01:53,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697078010] [2023-03-31 21:01:53,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:53,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:01:53,924 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:01:53,924 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [293940304] [2023-03-31 21:01:53,924 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 21:01:53,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:53,924 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:01:53,930 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:01:53,930 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-03-31 21:01:53,995 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 21:01:53,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 21:01:53,997 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 21:01:53,999 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:01:54,035 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 21:01:54,036 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:01:54,070 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 21:01:54,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:01:54,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697078010] [2023-03-31 21:01:54,070 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:01:54,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293940304] [2023-03-31 21:01:54,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293940304] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:01:54,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1726385795] [2023-03-31 21:01:54,073 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-03-31 21:01:54,073 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:01:54,073 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:01:54,073 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:01:54,073 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:01:54,113 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:01:54,207 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 21:01:54,212 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:01:54,214 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:01:54,218 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:01:54,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1556#(and (<= ~N~0 2147483647) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((v_main_~c~0.base_BEFORE_CALL_4 Int)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_4) 0) ~N~0))) (= |#NULL.offset| 0) (< 0 ~N~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:01:54,616 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:01:54,616 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:01:54,616 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-03-31 21:01:54,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057171579] [2023-03-31 21:01:54,616 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:01:54,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-03-31 21:01:54,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:01:54,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-03-31 21:01:54,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2023-03-31 21:01:54,617 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:54,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:01:54,878 INFO L93 Difference]: Finished difference Result 94 states and 116 transitions. [2023-03-31 21:01:54,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-03-31 21:01:54,879 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2023-03-31 21:01:54,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:01:54,879 INFO L225 Difference]: With dead ends: 94 [2023-03-31 21:01:54,879 INFO L226 Difference]: Without dead ends: 72 [2023-03-31 21:01:54,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=203, Invalid=1203, Unknown=0, NotChecked=0, Total=1406 [2023-03-31 21:01:54,882 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 35 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 21:01:54,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 65 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 21:01:54,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-03-31 21:01:54,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 52. [2023-03-31 21:01:54,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 40 states have (on average 1.3) internal successors, (52), 42 states have internal predecessors, (52), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 21:01:54,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 64 transitions. [2023-03-31 21:01:54,899 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 64 transitions. Word has length 25 [2023-03-31 21:01:54,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:01:54,899 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 64 transitions. [2023-03-31 21:01:54,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:01:54,899 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 64 transitions. [2023-03-31 21:01:54,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-03-31 21:01:54,901 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:01:54,902 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:01:54,909 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-03-31 21:01:55,107 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:55,107 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:01:55,108 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:01:55,108 INFO L85 PathProgramCache]: Analyzing trace with hash 1109071910, now seen corresponding path program 4 times [2023-03-31 21:01:55,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:01:55,108 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311395419] [2023-03-31 21:01:55,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:01:55,108 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:01:55,136 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:01:55,136 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1903402739] [2023-03-31 21:01:55,136 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 21:01:55,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:01:55,136 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:01:55,142 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:01:55,145 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-03-31 21:01:55,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:01:55,765 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 62 conjunts are in the unsatisfiable core [2023-03-31 21:01:55,768 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:01:55,871 INFO L321 Elim1Store]: treesize reduction 117, result has 35.4 percent of original size [2023-03-31 21:01:55,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 92 treesize of output 229 [2023-03-31 21:01:55,890 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:55,901 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:55,910 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:01:55,963 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:55,964 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:55,966 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:55,970 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:55,971 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 69 [2023-03-31 21:01:55,976 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 5 treesize of output 3 [2023-03-31 21:01:56,019 INFO L321 Elim1Store]: treesize reduction 48, result has 26.2 percent of original size [2023-03-31 21:01:56,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 10 case distinctions, treesize of input 112 treesize of output 117 [2023-03-31 21:01:56,051 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 5 treesize of output 3 [2023-03-31 21:01:56,131 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:56,132 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 11 [2023-03-31 21:01:56,135 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 5 treesize of output 3 [2023-03-31 21:01:56,198 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:56,198 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:56,199 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 41 treesize of output 5 [2023-03-31 21:01:56,205 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 5 treesize of output 3 [2023-03-31 21:01:56,216 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 14 treesize of output 12 [2023-03-31 21:01:56,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:01:56,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:01:56,252 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2023-03-31 21:01:56,252 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 51 treesize of output 56 [2023-03-31 21:01:56,265 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 5 treesize of output 3 [2023-03-31 21:01:56,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-03-31 21:01:56,319 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-03-31 21:01:56,361 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 [2023-03-31 21:01:56,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 [2023-03-31 21:01:56,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 [2023-03-31 21:01:56,444 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 18 [2023-03-31 21:01:56,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 18 [2023-03-31 21:01:56,493 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 18 [2023-03-31 21:01:56,521 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 [2023-03-31 21:01:56,552 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:01:56,552 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:01:56,875 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_459 (Array Int Int))) (= c_~N~0 (select (select (store |c_#memory_int| c_main_~b~0.base v_ArrVal_459) c_main_~c~0.base) c_main_~c~0.offset))) is different from false [2023-03-31 21:01:56,886 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_459 (Array Int Int)) (v_ArrVal_456 (Array Int Int))) (= c_~N~0 (select (select (store (store |c_#memory_int| c_main_~a~0.base v_ArrVal_456) c_main_~b~0.base v_ArrVal_459) c_main_~c~0.base) c_main_~c~0.offset))) is different from false [2023-03-31 21:01:56,897 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:56,898 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:01:56,913 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 6 not checked. [2023-03-31 21:01:56,913 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:01:56,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311395419] [2023-03-31 21:01:56,914 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:01:56,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903402739] [2023-03-31 21:01:56,914 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903402739] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:01:56,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1218532200] [2023-03-31 21:01:56,915 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-03-31 21:01:56,916 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:01:56,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:01:56,916 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:01:56,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:01:56,936 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:01:57,075 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 21:01:57,080 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:01:57,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:01:57,087 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:01:57,537 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2024#(and (<= ~N~0 2147483647) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((v_main_~c~0.base_BEFORE_CALL_5 Int)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_5) 0) ~N~0))) (= |#NULL.offset| 0) (< 0 ~N~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:01:57,537 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:01:57,537 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:01:57,537 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12] total 28 [2023-03-31 21:01:57,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754410323] [2023-03-31 21:01:57,538 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:01:57,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-03-31 21:01:57,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:01:57,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-03-31 21:01:57,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1467, Unknown=2, NotChecked=158, Total=1806 [2023-03-31 21:01:57,544 INFO L87 Difference]: Start difference. First operand 52 states and 64 transitions. Second operand has 28 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 21:02:09,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:02:09,431 INFO L93 Difference]: Finished difference Result 92 states and 121 transitions. [2023-03-31 21:02:09,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-03-31 21:02:09,431 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 27 [2023-03-31 21:02:09,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:02:09,433 INFO L225 Difference]: With dead ends: 92 [2023-03-31 21:02:09,433 INFO L226 Difference]: Without dead ends: 90 [2023-03-31 21:02:09,434 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 40 SyntacticMatches, 10 SemanticMatches, 55 ConstructedPredicates, 2 IntricatePredicates, 1 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=349, Invalid=2617, Unknown=12, NotChecked=214, Total=3192 [2023-03-31 21:02:09,434 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 88 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 90 mSolverCounterUnsat, 24 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 736 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 24 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-03-31 21:02:09,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 80 Invalid, 736 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 464 Invalid, 24 Unknown, 158 Unchecked, 0.8s Time] [2023-03-31 21:02:09,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-03-31 21:02:09,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 62. [2023-03-31 21:02:09,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 48 states have (on average 1.3333333333333333) internal successors, (64), 51 states have internal predecessors, (64), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-03-31 21:02:09,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 78 transitions. [2023-03-31 21:02:09,448 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 78 transitions. Word has length 27 [2023-03-31 21:02:09,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:02:09,448 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 78 transitions. [2023-03-31 21:02:09,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 21:02:09,449 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 78 transitions. [2023-03-31 21:02:09,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-03-31 21:02:09,449 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:02:09,449 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:02:09,465 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-03-31 21:02:09,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:09,662 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:02:09,662 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:02:09,662 INFO L85 PathProgramCache]: Analyzing trace with hash 1643694567, now seen corresponding path program 1 times [2023-03-31 21:02:09,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:02:09,662 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014639756] [2023-03-31 21:02:09,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:02:09,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:02:09,682 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:02:09,682 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1768593256] [2023-03-31 21:02:09,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:02:09,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:09,682 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:02:09,686 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:02:09,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-03-31 21:02:09,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:02:09,828 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 52 conjunts are in the unsatisfiable core [2023-03-31 21:02:09,831 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:02:09,846 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-03-31 21:02:09,846 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 19 [2023-03-31 21:02:09,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:02:09,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:02:09,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:02:09,860 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2023-03-31 21:02:09,863 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:02:09,868 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:02:09,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2023-03-31 21:02:09,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-03-31 21:02:09,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 30 [2023-03-31 21:02:10,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 15 [2023-03-31 21:02:10,239 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:02:10,239 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:02:10,878 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:10,878 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:10,879 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:10,895 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:02:10,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:02:10,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014639756] [2023-03-31 21:02:10,895 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:02:10,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768593256] [2023-03-31 21:02:10,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768593256] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:02:10,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [870262784] [2023-03-31 21:02:10,896 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 21:02:10,896 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:02:10,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:02:10,897 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:02:10,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:02:10,916 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:02:11,048 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:11,049 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:11,069 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:11,070 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:11,080 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 21:02:11,093 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:02:11,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:02:11,099 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:02:11,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2532#(and (<= 0 ~N~0) (<= ~N~0 2147483647) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:02:11,737 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:02:11,737 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:02:11,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2023-03-31 21:02:11,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069264752] [2023-03-31 21:02:11,738 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:02:11,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-03-31 21:02:11,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:02:11,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-03-31 21:02:11,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1564, Unknown=12, NotChecked=0, Total=1722 [2023-03-31 21:02:11,739 INFO L87 Difference]: Start difference. First operand 62 states and 78 transitions. Second operand has 25 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 21:02:13,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:02:13,138 INFO L93 Difference]: Finished difference Result 95 states and 113 transitions. [2023-03-31 21:02:13,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-03-31 21:02:13,139 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 28 [2023-03-31 21:02:13,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:02:13,140 INFO L225 Difference]: With dead ends: 95 [2023-03-31 21:02:13,140 INFO L226 Difference]: Without dead ends: 84 [2023-03-31 21:02:13,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 861 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=298, Invalid=2552, Unknown=12, NotChecked=0, Total=2862 [2023-03-31 21:02:13,141 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 78 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-03-31 21:02:13,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 137 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 352 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-03-31 21:02:13,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-03-31 21:02:13,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 65. [2023-03-31 21:02:13,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 52 states have internal predecessors, (61), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2023-03-31 21:02:13,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 77 transitions. [2023-03-31 21:02:13,156 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 77 transitions. Word has length 28 [2023-03-31 21:02:13,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:02:13,156 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 77 transitions. [2023-03-31 21:02:13,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 1.6363636363636365) internal successors, (36), 22 states have internal predecessors, (36), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 21:02:13,156 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 77 transitions. [2023-03-31 21:02:13,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-03-31 21:02:13,157 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:02:13,157 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:02:13,165 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-03-31 21:02:13,362 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,SelfDestructingSolverStorable7 [2023-03-31 21:02:13,362 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:02:13,362 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:02:13,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1729691655, now seen corresponding path program 2 times [2023-03-31 21:02:13,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:02:13,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719081995] [2023-03-31 21:02:13,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:02:13,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:02:13,387 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:02:13,387 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1918632195] [2023-03-31 21:02:13,387 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 21:02:13,387 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:13,388 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:02:13,391 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:02:13,392 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-03-31 21:02:13,625 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-03-31 21:02:13,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 21:02:13,627 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 7 conjunts are in the unsatisfiable core [2023-03-31 21:02:13,628 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:02:13,676 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-03-31 21:02:13,676 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:02:13,717 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 21:02:13,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:02:13,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719081995] [2023-03-31 21:02:13,717 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:02:13,718 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918632195] [2023-03-31 21:02:13,718 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918632195] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:02:13,718 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1372566776] [2023-03-31 21:02:13,719 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 21:02:13,719 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:02:13,719 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:02:13,719 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:02:13,719 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:02:13,744 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:02:13,865 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:13,865 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:13,883 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:13,883 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:13,891 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 21:02:13,904 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:02:13,906 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:02:13,910 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:02:14,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3039#(and (<= 0 ~N~0) (<= ~N~0 2147483647) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:02:14,349 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:02:14,349 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:02:14,349 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2023-03-31 21:02:14,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684713727] [2023-03-31 21:02:14,349 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:02:14,349 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-03-31 21:02:14,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:02:14,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-03-31 21:02:14,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2023-03-31 21:02:14,350 INFO L87 Difference]: Start difference. First operand 65 states and 77 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-03-31 21:02:14,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:02:14,710 INFO L93 Difference]: Finished difference Result 116 states and 131 transitions. [2023-03-31 21:02:14,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-03-31 21:02:14,711 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2023-03-31 21:02:14,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:02:14,711 INFO L225 Difference]: With dead ends: 116 [2023-03-31 21:02:14,711 INFO L226 Difference]: Without dead ends: 80 [2023-03-31 21:02:14,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=233, Invalid=1489, Unknown=0, NotChecked=0, Total=1722 [2023-03-31 21:02:14,712 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 43 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 21:02:14,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 98 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 21:02:14,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-03-31 21:02:14,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 54. [2023-03-31 21:02:14,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.2142857142857142) internal successors, (51), 43 states have internal predecessors, (51), 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) [2023-03-31 21:02:14,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 62 transitions. [2023-03-31 21:02:14,725 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 62 transitions. Word has length 32 [2023-03-31 21:02:14,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:02:14,725 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 62 transitions. [2023-03-31 21:02:14,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-03-31 21:02:14,725 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 62 transitions. [2023-03-31 21:02:14,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-03-31 21:02:14,726 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:02:14,726 INFO L195 NwaCegarLoop]: trace histogram [7, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:02:14,734 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-03-31 21:02:14,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:14,932 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:02:14,932 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:02:14,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1061464358, now seen corresponding path program 5 times [2023-03-31 21:02:14,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:02:14,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585495350] [2023-03-31 21:02:14,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:02:14,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:02:14,964 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:02:14,964 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1044829331] [2023-03-31 21:02:14,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 21:02:14,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:14,965 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:02:14,980 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:02:14,982 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-03-31 21:02:16,715 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-03-31 21:02:16,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 21:02:16,722 INFO L262 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 10 conjunts are in the unsatisfiable core [2023-03-31 21:02:16,724 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:02:16,789 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-03-31 21:02:16,789 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:02:16,842 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-03-31 21:02:16,842 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:02:16,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585495350] [2023-03-31 21:02:16,842 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:02:16,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044829331] [2023-03-31 21:02:16,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044829331] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:02:16,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1497345695] [2023-03-31 21:02:16,843 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-03-31 21:02:16,843 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:02:16,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:02:16,843 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:02:16,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:02:16,863 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:02:16,955 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 21:02:16,960 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:02:16,962 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:02:16,966 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:02:17,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3556#(and (<= ~N~0 2147483647) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (< 0 ~N~0) (exists ((v_main_~c~0.base_BEFORE_CALL_12 Int)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_12) 0) ~N~0))) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:02:17,391 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:02:17,391 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:02:17,391 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2023-03-31 21:02:17,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609615929] [2023-03-31 21:02:17,391 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:02:17,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-03-31 21:02:17,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:02:17,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-03-31 21:02:17,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=756, Unknown=0, NotChecked=0, Total=870 [2023-03-31 21:02:17,393 INFO L87 Difference]: Start difference. First operand 54 states and 62 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:02:17,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:02:17,813 INFO L93 Difference]: Finished difference Result 127 states and 152 transitions. [2023-03-31 21:02:17,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-03-31 21:02:17,813 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2023-03-31 21:02:17,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:02:17,814 INFO L225 Difference]: With dead ends: 127 [2023-03-31 21:02:17,814 INFO L226 Difference]: Without dead ends: 101 [2023-03-31 21:02:17,815 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 543 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=291, Invalid=1689, Unknown=0, NotChecked=0, Total=1980 [2023-03-31 21:02:17,815 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 41 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 21:02:17,815 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 106 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 21:02:17,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-03-31 21:02:17,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 75. [2023-03-31 21:02:17,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 62 states have internal predecessors, (70), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2023-03-31 21:02:17,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 86 transitions. [2023-03-31 21:02:17,835 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 86 transitions. Word has length 31 [2023-03-31 21:02:17,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:02:17,835 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 86 transitions. [2023-03-31 21:02:17,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:02:17,835 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 86 transitions. [2023-03-31 21:02:17,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-03-31 21:02:17,836 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:02:17,836 INFO L195 NwaCegarLoop]: trace histogram [7, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:02:17,844 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-03-31 21:02:18,038 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,SelfDestructingSolverStorable9 [2023-03-31 21:02:18,038 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:02:18,039 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:02:18,039 INFO L85 PathProgramCache]: Analyzing trace with hash -237138701, now seen corresponding path program 6 times [2023-03-31 21:02:18,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:02:18,039 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61129455] [2023-03-31 21:02:18,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:02:18,039 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:02:18,074 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:02:18,074 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1687852903] [2023-03-31 21:02:18,074 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 21:02:18,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:18,074 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:02:18,082 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:02:18,084 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-03-31 21:02:18,171 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 21:02:18,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 21:02:18,173 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 12 conjunts are in the unsatisfiable core [2023-03-31 21:02:18,174 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:02:18,269 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-03-31 21:02:18,269 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:02:18,342 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-03-31 21:02:18,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:02:18,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61129455] [2023-03-31 21:02:18,342 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:02:18,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687852903] [2023-03-31 21:02:18,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687852903] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:02:18,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2143794109] [2023-03-31 21:02:18,344 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-03-31 21:02:18,344 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:02:18,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:02:18,344 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:02:18,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:02:18,371 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:02:18,473 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 21:02:18,478 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:02:18,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:02:18,486 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:02:18,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4154#(and (exists ((v_main_~c~0.base_BEFORE_CALL_13 Int)) (not (= (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_13) 0) ~N~0))) (<= ~N~0 2147483647) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (< 0 ~N~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:02:18,956 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:02:18,956 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:02:18,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2023-03-31 21:02:18,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139107907] [2023-03-31 21:02:18,956 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:02:18,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-03-31 21:02:18,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:02:18,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-03-31 21:02:18,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=916, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 21:02:18,957 INFO L87 Difference]: Start difference. First operand 75 states and 86 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:02:19,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:02:19,707 INFO L93 Difference]: Finished difference Result 166 states and 199 transitions. [2023-03-31 21:02:19,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-03-31 21:02:19,707 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2023-03-31 21:02:19,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:02:19,708 INFO L225 Difference]: With dead ends: 166 [2023-03-31 21:02:19,708 INFO L226 Difference]: Without dead ends: 134 [2023-03-31 21:02:19,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 61 SyntacticMatches, 6 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 934 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=518, Invalid=2788, Unknown=0, NotChecked=0, Total=3306 [2023-03-31 21:02:19,709 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 68 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 21:02:19,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 114 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 21:02:19,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2023-03-31 21:02:19,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 106. [2023-03-31 21:02:19,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 88 states have internal predecessors, (100), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 8 states have call predecessors, (11), 11 states have call successors, (11) [2023-03-31 21:02:19,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 124 transitions. [2023-03-31 21:02:19,745 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 124 transitions. Word has length 33 [2023-03-31 21:02:19,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:02:19,745 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 124 transitions. [2023-03-31 21:02:19,745 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:02:19,745 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 124 transitions. [2023-03-31 21:02:19,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-03-31 21:02:19,746 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:02:19,746 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:02:19,757 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-03-31 21:02:19,951 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,SelfDestructingSolverStorable10 [2023-03-31 21:02:19,951 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:02:19,951 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:02:19,951 INFO L85 PathProgramCache]: Analyzing trace with hash 105740167, now seen corresponding path program 3 times [2023-03-31 21:02:19,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:02:19,951 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239452431] [2023-03-31 21:02:19,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:02:19,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:02:19,975 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:02:19,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1981534431] [2023-03-31 21:02:19,975 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 21:02:19,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:19,975 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:02:19,976 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:02:19,978 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-03-31 21:02:20,769 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 21:02:20,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 21:02:20,772 INFO L262 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 70 conjunts are in the unsatisfiable core [2023-03-31 21:02:20,776 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:02:20,792 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-03-31 21:02:20,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 19 [2023-03-31 21:02:20,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:02:20,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:02:20,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:02:20,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2023-03-31 21:02:20,803 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:02:20,806 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-03-31 21:02:20,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2023-03-31 21:02:20,854 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2023-03-31 21:02:20,882 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 26 [2023-03-31 21:02:20,932 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-03-31 21:02:20,954 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-03-31 21:02:20,978 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-03-31 21:02:20,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 30 [2023-03-31 21:02:21,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 40 [2023-03-31 21:02:21,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 40 [2023-03-31 21:02:21,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 15 [2023-03-31 21:02:21,274 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:02:21,275 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:02:28,148 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-03-31 21:02:28,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:02:28,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239452431] [2023-03-31 21:02:28,148 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:02:28,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981534431] [2023-03-31 21:02:28,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981534431] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:02:28,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1522534632] [2023-03-31 21:02:28,150 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 21:02:28,150 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:02:28,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:02:28,150 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:02:28,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:02:28,169 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:02:28,282 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:28,282 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:28,300 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:28,301 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 11 iterations. Over-approximation may be very coarse. [2023-03-31 21:02:28,308 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2023-03-31 21:02:28,326 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:02:28,328 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:02:28,333 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:02:29,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4911#(and (<= 0 ~N~0) (<= ~N~0 2147483647) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:02:29,110 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:02:29,110 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:02:29,110 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 31 [2023-03-31 21:02:29,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142102644] [2023-03-31 21:02:29,110 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:02:29,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-03-31 21:02:29,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:02:29,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-03-31 21:02:29,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=2056, Unknown=6, NotChecked=0, Total=2256 [2023-03-31 21:02:29,112 INFO L87 Difference]: Start difference. First operand 106 states and 124 transitions. Second operand has 31 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 30 states have internal predecessors, (44), 5 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-03-31 21:02:37,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:02:37,787 INFO L93 Difference]: Finished difference Result 230 states and 275 transitions. [2023-03-31 21:02:37,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-03-31 21:02:37,787 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 30 states have internal predecessors, (44), 5 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 34 [2023-03-31 21:02:37,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:02:37,788 INFO L225 Difference]: With dead ends: 230 [2023-03-31 21:02:37,789 INFO L226 Difference]: Without dead ends: 228 [2023-03-31 21:02:37,790 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=502, Invalid=4183, Unknown=7, NotChecked=0, Total=4692 [2023-03-31 21:02:37,790 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 145 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 580 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 746 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2023-03-31 21:02:37,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 189 Invalid, 746 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 580 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2023-03-31 21:02:37,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2023-03-31 21:02:37,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 174. [2023-03-31 21:02:37,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 134 states have (on average 1.1865671641791045) internal successors, (159), 141 states have internal predecessors, (159), 24 states have call successors, (24), 16 states have call predecessors, (24), 15 states have return successors, (21), 16 states have call predecessors, (21), 21 states have call successors, (21) [2023-03-31 21:02:37,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 204 transitions. [2023-03-31 21:02:37,856 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 204 transitions. Word has length 34 [2023-03-31 21:02:37,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:02:37,857 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 204 transitions. [2023-03-31 21:02:37,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 30 states have internal predecessors, (44), 5 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-03-31 21:02:37,857 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 204 transitions. [2023-03-31 21:02:37,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-03-31 21:02:37,857 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:02:37,857 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:02:37,873 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-03-31 21:02:38,073 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,SelfDestructingSolverStorable11 [2023-03-31 21:02:38,073 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:02:38,074 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:02:38,074 INFO L85 PathProgramCache]: Analyzing trace with hash 969287430, now seen corresponding path program 7 times [2023-03-31 21:02:38,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:02:38,074 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912819586] [2023-03-31 21:02:38,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:02:38,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:02:38,113 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:02:38,114 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [168790769] [2023-03-31 21:02:38,114 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 21:02:38,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:38,114 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:02:38,115 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:02:38,118 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-03-31 21:02:38,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:02:38,220 INFO L262 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 14 conjunts are in the unsatisfiable core [2023-03-31 21:02:38,221 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:02:38,321 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 27 proven. 15 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-03-31 21:02:38,321 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:02:38,425 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 27 proven. 15 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-03-31 21:02:38,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:02:38,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912819586] [2023-03-31 21:02:38,426 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 21:02:38,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168790769] [2023-03-31 21:02:38,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168790769] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:02:38,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026722326] [2023-03-31 21:02:38,427 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-03-31 21:02:38,427 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:02:38,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:02:38,427 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:02:38,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:02:38,454 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2023-03-31 21:02:38,551 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-03-31 21:02:38,556 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 24 for LOIs [2023-03-31 21:02:38,558 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 21:02:38,562 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 21:02:38,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5865#(and (<= ~N~0 2147483647) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (exists ((v_main_~c~0.base_BEFORE_CALL_18 Int)) (not (= ~N~0 (select (select |#memory_int| v_main_~c~0.base_BEFORE_CALL_18) 0)))) (< 0 ~N~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 21:02:38,991 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 21:02:38,991 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 21:02:38,991 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2023-03-31 21:02:38,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550023847] [2023-03-31 21:02:38,991 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 21:02:38,992 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-03-31 21:02:38,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:02:38,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-03-31 21:02:38,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1090, Unknown=0, NotChecked=0, Total=1260 [2023-03-31 21:02:38,993 INFO L87 Difference]: Start difference. First operand 174 states and 204 transitions. Second operand has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:02:40,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:02:40,062 INFO L93 Difference]: Finished difference Result 415 states and 494 transitions. [2023-03-31 21:02:40,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-03-31 21:02:40,062 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2023-03-31 21:02:40,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:02:40,064 INFO L225 Difference]: With dead ends: 415 [2023-03-31 21:02:40,064 INFO L226 Difference]: Without dead ends: 292 [2023-03-31 21:02:40,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 63 SyntacticMatches, 7 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=858, Invalid=4398, Unknown=0, NotChecked=0, Total=5256 [2023-03-31 21:02:40,066 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 102 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 587 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 289 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 21:02:40,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 115 Invalid, 587 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [289 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 21:02:40,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2023-03-31 21:02:40,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 187. [2023-03-31 21:02:40,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 147 states have (on average 1.2040816326530612) internal successors, (177), 154 states have internal predecessors, (177), 24 states have call successors, (24), 16 states have call predecessors, (24), 15 states have return successors, (21), 16 states have call predecessors, (21), 21 states have call successors, (21) [2023-03-31 21:02:40,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 222 transitions. [2023-03-31 21:02:40,138 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 222 transitions. Word has length 35 [2023-03-31 21:02:40,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:02:40,138 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 222 transitions. [2023-03-31 21:02:40,138 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-03-31 21:02:40,138 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 222 transitions. [2023-03-31 21:02:40,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-03-31 21:02:40,139 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:02:40,139 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:02:40,145 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-03-31 21:02:40,339 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,SelfDestructingSolverStorable12 [2023-03-31 21:02:40,339 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:02:40,340 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:02:40,340 INFO L85 PathProgramCache]: Analyzing trace with hash -415621443, now seen corresponding path program 4 times [2023-03-31 21:02:40,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:02:40,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670686411] [2023-03-31 21:02:40,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:02:40,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:02:40,364 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 21:02:40,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [430570512] [2023-03-31 21:02:40,365 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 21:02:40,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:02:40,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:02:40,371 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 21:02:40,371 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-03-31 21:02:40,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:02:40,732 INFO L262 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 81 conjunts are in the unsatisfiable core [2023-03-31 21:02:40,735 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:02:40,805 INFO L321 Elim1Store]: treesize reduction 34, result has 50.7 percent of original size [2023-03-31 21:02:40,805 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 266 treesize of output 233 [2023-03-31 21:02:41,025 INFO L321 Elim1Store]: treesize reduction 312, result has 25.9 percent of original size [2023-03-31 21:02:41,025 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 6 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 217 treesize of output 616 [2023-03-31 21:02:41,053 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 37 treesize of output 33 [2023-03-31 21:02:41,072 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2023-03-31 21:02:41,092 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2023-03-31 21:02:41,232 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2023-03-31 21:02:41,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 78 treesize of output 87 [2023-03-31 21:02:41,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 51 [2023-03-31 21:02:41,914 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-03-31 21:02:41,966 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:41,988 INFO L321 Elim1Store]: treesize reduction 37, result has 17.8 percent of original size [2023-03-31 21:02:41,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 7 case distinctions, treesize of input 245 treesize of output 301 [2023-03-31 21:02:42,031 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 5 treesize of output 3 [2023-03-31 21:02:42,089 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:42,092 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:42,093 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:42,093 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:42,095 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:42,095 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 3 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 82 treesize of output 138 [2023-03-31 21:02:42,110 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 5 treesize of output 3 [2023-03-31 21:02:42,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 3 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 1117 treesize of output 1042 [2023-03-31 21:02:43,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 22 treesize of output 18 [2023-03-31 21:02:43,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 38 treesize of output 34 [2023-03-31 21:02:43,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 42 treesize of output 37 [2023-03-31 21:02:43,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 42 treesize of output 37 [2023-03-31 21:02:43,363 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:43,365 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 68 treesize of output 41 [2023-03-31 21:02:43,372 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 5 treesize of output 3 [2023-03-31 21:02:43,519 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:43,521 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 21:02:43,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 48 [2023-03-31 21:02:43,526 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-03-31 21:02:43,528 WARN L207 Elim1Store]: Array PQE input equivalent to false [2023-03-31 21:02:43,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 21:02:43,586 INFO L321 Elim1Store]: treesize reduction 12, result has 60.0 percent of original size [2023-03-31 21:02:43,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 147 treesize of output 124 [2023-03-31 21:02:43,592 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 87 treesize of output 85 [2023-03-31 21:02:43,649 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 5 treesize of output 3 [2023-03-31 21:02:43,683 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-03-31 21:02:43,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 19 [2023-03-31 21:02:43,726 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-03-31 21:02:43,726 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 38 [2023-03-31 21:02:43,773 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-03-31 21:02:43,773 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 49 treesize of output 53 [2023-03-31 21:02:43,879 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2023-03-31 21:02:43,879 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 53 treesize of output 60 [2023-03-31 21:02:43,951 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2023-03-31 21:02:43,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 69 treesize of output 75 [2023-03-31 21:02:44,068 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2023-03-31 21:02:44,068 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 5 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 9 case distinctions, treesize of input 79 treesize of output 84 [2023-03-31 21:02:44,157 INFO L321 Elim1Store]: treesize reduction 92, result has 14.0 percent of original size [2023-03-31 21:02:44,157 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 3 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 30 case distinctions, treesize of input 88 treesize of output 96 [2023-03-31 21:02:44,847 INFO L321 Elim1Store]: treesize reduction 60, result has 17.8 percent of original size [2023-03-31 21:02:44,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 3 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 91 treesize of output 51 [2023-03-31 21:02:44,907 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 21:02:44,907 INFO L327 TraceCheckSpWp]: Computing backward predicates...