/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/loops/invert_string-3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 22:57:51,252 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 22:57:51,253 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 22:57:51,283 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 22:57:51,283 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 22:57:51,285 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 22:57:51,288 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 22:57:51,290 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 22:57:51,291 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 22:57:51,294 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 22:57:51,296 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 22:57:51,297 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 22:57:51,297 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 22:57:51,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 22:57:51,300 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 22:57:51,300 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 22:57:51,301 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 22:57:51,301 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 22:57:51,303 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 22:57:51,307 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 22:57:51,308 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 22:57:51,309 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 22:57:51,310 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 22:57:51,311 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 22:57:51,316 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 22:57:51,319 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 22:57:51,319 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 22:57:51,320 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 22:57:51,320 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 22:57:51,321 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 22:57:51,321 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 22:57:51,321 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 22:57:51,321 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 22:57:51,322 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 22:57:51,322 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 22:57:51,322 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 22:57:51,324 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 22:57:51,347 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 22:57:51,347 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 22:57:51,348 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 22:57:51,348 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 22:57:51,348 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 22:57:51,349 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 22:57:51,349 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 22:57:51,349 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 22:57:51,349 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 22:57:51,349 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 22:57:51,350 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 22:57:51,350 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 22:57:51,350 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 22:57:51,350 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 22:57:51,350 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 22:57:51,350 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 22:57:51,350 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 22:57:51,350 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 22:57:51,351 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 22:57:51,351 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 22:57:51,351 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 22:57:51,351 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 22:57:51,351 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 22:57:51,351 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 22:57:51,351 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 22:57:51,351 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 22:57:51,352 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 22:57:51,352 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 22:57:51,352 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 22:57:51,352 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 22:57:51,352 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 22:57:51,352 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 22:57:51,352 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:57:51,352 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 22:57:51,352 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 22:57:51,353 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 22:57:51,353 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 22:57:51,353 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 22:57:51,353 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 22:57:51,353 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 22:57:51,353 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 22:57:51,353 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 22:57:51,549 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 22:57:51,583 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 22:57:51,585 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 22:57:51,586 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 22:57:51,586 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 22:57:51,587 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/invert_string-3.c [2023-03-31 22:57:52,653 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 22:57:52,796 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 22:57:52,796 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/invert_string-3.c [2023-03-31 22:57:52,801 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37add494c/143f23de317e46ad8f4fc28a3900bec6/FLAG1e5b30988 [2023-03-31 22:57:52,810 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37add494c/143f23de317e46ad8f4fc28a3900bec6 [2023-03-31 22:57:52,812 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 22:57:52,813 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 22:57:52,814 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 22:57:52,814 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 22:57:52,816 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 22:57:52,817 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,817 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e7cd60c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52, skipping insertion in model container [2023-03-31 22:57:52,817 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,822 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 22:57:52,831 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 22:57:52,914 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/loops/invert_string-3.c[327,340] [2023-03-31 22:57:52,932 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:57:52,940 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 22:57:52,948 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/loops/invert_string-3.c[327,340] [2023-03-31 22:57:52,953 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:57:52,964 INFO L208 MainTranslator]: Completed translation [2023-03-31 22:57:52,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52 WrapperNode [2023-03-31 22:57:52,964 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 22:57:52,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 22:57:52,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 22:57:52,966 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 22:57:52,974 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,974 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,979 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,979 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,983 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,985 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,986 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,986 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,988 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 22:57:52,988 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 22:57:52,988 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 22:57:52,988 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 22:57:52,989 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (1/1) ... [2023-03-31 22:57:52,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:57:53,000 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:57:53,010 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 22:57:53,039 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 22:57:53,053 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 22:57:53,053 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 22:57:53,053 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 22:57:53,054 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 22:57:53,054 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-03-31 22:57:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 22:57:53,055 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 22:57:53,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 22:57:53,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 22:57:53,055 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 22:57:53,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 22:57:53,108 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 22:57:53,109 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 22:57:53,220 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 22:57:53,246 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 22:57:53,246 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-03-31 22:57:53,248 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:57:53 BoogieIcfgContainer [2023-03-31 22:57:53,248 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 22:57:53,250 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 22:57:53,250 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 22:57:53,252 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 22:57:53,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 10:57:52" (1/3) ... [2023-03-31 22:57:53,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61c04b8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:57:53, skipping insertion in model container [2023-03-31 22:57:53,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:57:52" (2/3) ... [2023-03-31 22:57:53,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61c04b8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:57:53, skipping insertion in model container [2023-03-31 22:57:53,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:57:53" (3/3) ... [2023-03-31 22:57:53,253 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string-3.c [2023-03-31 22:57:53,265 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 22:57:53,266 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 22:57:53,297 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 22:57:53,301 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;@26c7465f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 22:57:53,301 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 22:57:53,304 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 22:57:53,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-03-31 22:57:53,310 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:57:53,310 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:57:53,310 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:57:53,314 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:57:53,314 INFO L85 PathProgramCache]: Analyzing trace with hash -262835160, now seen corresponding path program 1 times [2023-03-31 22:57:53,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:57:53,321 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501632215] [2023-03-31 22:57:53,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:57:53,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:57:53,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:57:53,814 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 22:57:53,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:57:53,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501632215] [2023-03-31 22:57:53,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501632215] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:57:53,816 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:57:53,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-03-31 22:57:53,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517268109] [2023-03-31 22:57:53,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:57:53,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-03-31 22:57:53,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:57:53,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-03-31 22:57:53,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-03-31 22:57:53,876 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:57:53,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:57:53,975 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2023-03-31 22:57:53,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 22:57:53,977 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-03-31 22:57:53,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:57:53,981 INFO L225 Difference]: With dead ends: 32 [2023-03-31 22:57:53,981 INFO L226 Difference]: Without dead ends: 17 [2023-03-31 22:57:53,983 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-03-31 22:57:53,985 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 8 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 22:57:53,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 35 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 22:57:53,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-03-31 22:57:54,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-03-31 22:57:54,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 22:57:54,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2023-03-31 22:57:54,016 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2023-03-31 22:57:54,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:57:54,016 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2023-03-31 22:57:54,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:57:54,017 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2023-03-31 22:57:54,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-03-31 22:57:54,018 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:57:54,018 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:57:54,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 22:57:54,019 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:57:54,019 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:57:54,019 INFO L85 PathProgramCache]: Analyzing trace with hash -325405380, now seen corresponding path program 1 times [2023-03-31 22:57:54,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:57:54,020 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366190311] [2023-03-31 22:57:54,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:57:54,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:57:54,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:57:54,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:57:54,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:57:54,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366190311] [2023-03-31 22:57:54,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366190311] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:57:54,250 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:57:54,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 22:57:54,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705739481] [2023-03-31 22:57:54,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:57:54,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 22:57:54,251 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:57:54,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 22:57:54,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:57:54,252 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:57:54,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:57:54,279 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2023-03-31 22:57:54,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 22:57:54,280 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-03-31 22:57:54,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:57:54,281 INFO L225 Difference]: With dead ends: 29 [2023-03-31 22:57:54,281 INFO L226 Difference]: Without dead ends: 18 [2023-03-31 22:57:54,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:57:54,288 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 22:57:54,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 22:57:54,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-03-31 22:57:54,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-03-31 22:57:54,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 22:57:54,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-03-31 22:57:54,300 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2023-03-31 22:57:54,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:57:54,300 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-03-31 22:57:54,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:57:54,300 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-03-31 22:57:54,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-03-31 22:57:54,301 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:57:54,301 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:57:54,301 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 22:57:54,301 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:57:54,301 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:57:54,302 INFO L85 PathProgramCache]: Analyzing trace with hash -1057528460, now seen corresponding path program 1 times [2023-03-31 22:57:54,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:57:54,302 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77468038] [2023-03-31 22:57:54,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:57:54,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:57:54,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:57:54,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:57:54,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:57:54,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77468038] [2023-03-31 22:57:54,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77468038] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:57:54,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720566583] [2023-03-31 22:57:54,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:57:54,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:57:54,469 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:57:54,471 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 22:57:54,472 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 22:57:54,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:57:54,531 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 35 conjunts are in the unsatisfiable core [2023-03-31 22:57:54,539 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:57:54,586 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 10 treesize of output 8 [2023-03-31 22:57:54,675 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 50 treesize of output 45 [2023-03-31 22:57:54,683 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 12 treesize of output 11 [2023-03-31 22:57:54,689 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 14 treesize of output 13 [2023-03-31 22:57:54,744 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 15 treesize of output 15 [2023-03-31 22:57:54,853 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:57:54,855 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2023-03-31 22:57:54,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:57:54,888 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:57:55,075 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-03-31 22:57:55,075 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 328 treesize of output 1 [2023-03-31 22:57:55,082 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 22:57:55,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720566583] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:57:55,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561003731] [2023-03-31 22:57:55,104 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-03-31 22:57:55,104 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:57:55,109 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:57:55,113 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:57:55,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:57:55,167 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:57:55,259 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-03-31 22:57:55,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:57:55,276 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:57:55,598 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '274#(and (exists ((|v_main_~#str2~0.base_BEFORE_CALL_1| Int) (|v_main_~#str1~0.base_BEFORE_CALL_1| Int)) (and (not (= (select (select |#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_1|) 4))) (<= 0 |v_main_~#str2~0.base_BEFORE_CALL_1|) (<= 0 |v_main_~#str1~0.base_BEFORE_CALL_1|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:57:55,598 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:57:55,598 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:57:55,598 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 9, 8] total 16 [2023-03-31 22:57:55,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181830127] [2023-03-31 22:57:55,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:57:55,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-03-31 22:57:55,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:57:55,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-03-31 22:57:55,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2023-03-31 22:57:55,601 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 16 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:57:56,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:57:56,199 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2023-03-31 22:57:56,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-03-31 22:57:56,199 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-03-31 22:57:56,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:57:56,201 INFO L225 Difference]: With dead ends: 45 [2023-03-31 22:57:56,201 INFO L226 Difference]: Without dead ends: 34 [2023-03-31 22:57:56,202 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=176, Invalid=1156, Unknown=0, NotChecked=0, Total=1332 [2023-03-31 22:57:56,202 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 28 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 22:57:56,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 69 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 22:57:56,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-03-31 22:57:56,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2023-03-31 22:57:56,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 22:57:56,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2023-03-31 22:57:56,212 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 14 [2023-03-31 22:57:56,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:57:56,212 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2023-03-31 22:57:56,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:57:56,213 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2023-03-31 22:57:56,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-03-31 22:57:56,213 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:57:56,213 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:57:56,223 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 22:57:56,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:57:56,418 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:57:56,418 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:57:56,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1999055292, now seen corresponding path program 2 times [2023-03-31 22:57:56,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:57:56,419 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390912037] [2023-03-31 22:57:56,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:57:56,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:57:56,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:57:56,530 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 22:57:56,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:57:56,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390912037] [2023-03-31 22:57:56,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390912037] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:57:56,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307013192] [2023-03-31 22:57:56,531 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 22:57:56,531 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:57:56,531 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:57:56,545 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 22:57:56,596 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 22:57:56,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-03-31 22:57:56,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:57:56,639 INFO L262 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 9 conjunts are in the unsatisfiable core [2023-03-31 22:57:56,640 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:57:56,670 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 22:57:56,670 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:57:56,701 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 22:57:56,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307013192] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:57:56,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [773582173] [2023-03-31 22:57:56,703 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-03-31 22:57:56,703 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:57:56,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:57:56,704 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:57:56,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:57:56,724 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:57:56,792 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-03-31 22:57:56,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:57:56,806 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:57:57,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '530#(and (exists ((|v_main_~#str2~0.base_BEFORE_CALL_2| Int) (|v_main_~#str1~0.base_BEFORE_CALL_2| Int)) (and (<= 0 |v_main_~#str2~0.base_BEFORE_CALL_2|) (<= 0 |v_main_~#str1~0.base_BEFORE_CALL_2|) (not (= (select (select |#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_2|) 4) (select (select |#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_2|) 0))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:57:57,032 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:57:57,032 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:57:57,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2023-03-31 22:57:57,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908851749] [2023-03-31 22:57:57,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:57:57,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-03-31 22:57:57,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:57:57,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-03-31 22:57:57,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2023-03-31 22:57:57,034 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:57:57,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:57:57,089 INFO L93 Difference]: Finished difference Result 49 states and 59 transitions. [2023-03-31 22:57:57,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 22:57:57,090 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2023-03-31 22:57:57,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:57:57,091 INFO L225 Difference]: With dead ends: 49 [2023-03-31 22:57:57,091 INFO L226 Difference]: Without dead ends: 30 [2023-03-31 22:57:57,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2023-03-31 22:57:57,092 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 22:57:57,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 48 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 22:57:57,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-03-31 22:57:57,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-03-31 22:57:57,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 23 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 22:57:57,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2023-03-31 22:57:57,101 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 17 [2023-03-31 22:57:57,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:57:57,101 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2023-03-31 22:57:57,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:57:57,101 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2023-03-31 22:57:57,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-03-31 22:57:57,102 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:57:57,102 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:57:57,109 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-03-31 22:57:57,307 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,SelfDestructingSolverStorable3 [2023-03-31 22:57:57,307 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:57:57,307 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:57:57,307 INFO L85 PathProgramCache]: Analyzing trace with hash -1529391372, now seen corresponding path program 3 times [2023-03-31 22:57:57,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:57:57,307 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879809160] [2023-03-31 22:57:57,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:57:57,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:57:57,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:57:57,463 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 22:57:57,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:57:57,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879809160] [2023-03-31 22:57:57,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879809160] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:57:57,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277954247] [2023-03-31 22:57:57,464 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 22:57:57,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:57:57,464 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:57:57,465 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 22:57:57,493 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 22:57:57,544 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 22:57:57,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:57:57,546 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 42 conjunts are in the unsatisfiable core [2023-03-31 22:57:57,548 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:57:57,553 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 10 treesize of output 8 [2023-03-31 22:57:57,746 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 17 treesize of output 17 [2023-03-31 22:57:57,828 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:57:57,829 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:57:57,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 10 [2023-03-31 22:57:57,868 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 22:57:57,868 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:57:57,999 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:57:57,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2023-03-31 22:57:58,016 INFO L321 Elim1Store]: treesize reduction 26, result has 38.1 percent of original size [2023-03-31 22:57:58,016 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 104 treesize of output 89 [2023-03-31 22:57:58,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:57:58,039 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2023-03-31 22:57:58,043 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 33 treesize of output 24 [2023-03-31 22:57:58,058 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:57:58,059 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2023-03-31 22:57:58,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:57:58,074 INFO L321 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2023-03-31 22:57:58,075 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 94 treesize of output 73 [2023-03-31 22:57:58,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:57:58,096 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2023-03-31 22:57:58,100 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 28 treesize of output 20 [2023-03-31 22:57:58,400 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 22:57:58,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277954247] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:57:58,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1087433467] [2023-03-31 22:57:58,401 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-03-31 22:57:58,401 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:57:58,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:57:58,402 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:57:58,402 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:57:58,414 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:57:58,458 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-03-31 22:57:58,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:57:58,467 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:57:58,810 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '812#(and (exists ((|v_main_~#str2~0.base_BEFORE_CALL_3| Int) (|v_main_~#str1~0.base_BEFORE_CALL_3| Int)) (and (<= 0 |v_main_~#str1~0.base_BEFORE_CALL_3|) (not (= (select (select |#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_3|) 4) (select (select |#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_3|) 0))) (<= 0 |v_main_~#str2~0.base_BEFORE_CALL_3|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:57:58,810 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:57:58,810 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:57:58,810 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 10] total 23 [2023-03-31 22:57:58,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376419246] [2023-03-31 22:57:58,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:57:58,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-03-31 22:57:58,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:57:58,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-03-31 22:57:58,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=996, Unknown=0, NotChecked=0, Total=1122 [2023-03-31 22:57:58,812 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 23 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 21 states have internal predecessors, (32), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:58:00,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:00,249 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2023-03-31 22:58:00,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-03-31 22:58:00,250 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 21 states have internal predecessors, (32), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2023-03-31 22:58:00,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:00,263 INFO L225 Difference]: With dead ends: 59 [2023-03-31 22:58:00,263 INFO L226 Difference]: Without dead ends: 44 [2023-03-31 22:58:00,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=290, Invalid=1966, Unknown=0, NotChecked=0, Total=2256 [2023-03-31 22:58:00,270 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 63 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:00,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 97 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 22:58:00,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-03-31 22:58:00,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2023-03-31 22:58:00,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 22:58:00,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2023-03-31 22:58:00,290 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 20 [2023-03-31 22:58:00,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:00,290 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2023-03-31 22:58:00,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 21 states have internal predecessors, (32), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:58:00,290 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2023-03-31 22:58:00,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-03-31 22:58:00,290 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:00,291 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:00,303 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 22:58:00,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:00,496 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:00,496 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:00,496 INFO L85 PathProgramCache]: Analyzing trace with hash -2145208844, now seen corresponding path program 4 times [2023-03-31 22:58:00,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:00,496 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971870899] [2023-03-31 22:58:00,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:00,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:00,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:00,693 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 22:58:00,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:00,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971870899] [2023-03-31 22:58:00,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971870899] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:00,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550323895] [2023-03-31 22:58:00,693 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 22:58:00,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:00,694 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:00,709 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 22:58:00,712 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 22:58:00,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:00,777 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 57 conjunts are in the unsatisfiable core [2023-03-31 22:58:00,779 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:00,783 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 10 treesize of output 8 [2023-03-31 22:58:01,130 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 17 treesize of output 17 [2023-03-31 22:58:01,217 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:58:01,221 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-03-31 22:58:01,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 13 [2023-03-31 22:58:01,267 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 22:58:01,268 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:01,380 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:58:01,380 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2023-03-31 22:58:01,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:01,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2023-03-31 22:58:01,418 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 28 treesize of output 20 [2023-03-31 22:58:01,423 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 24 treesize of output 16 [2023-03-31 22:58:01,428 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 28 treesize of output 20 [2023-03-31 22:58:01,432 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-03-31 22:58:01,433 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 22 treesize of output 1 [2023-03-31 22:58:01,442 INFO L321 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2023-03-31 22:58:01,443 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 35 treesize of output 20 [2023-03-31 22:58:01,449 INFO L321 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2023-03-31 22:58:01,449 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 32 treesize of output 1 [2023-03-31 22:58:01,455 INFO L321 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2023-03-31 22:58:01,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 40 treesize of output 1 [2023-03-31 22:58:01,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:01,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:01,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 1 [2023-03-31 22:58:01,472 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:58:01,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2023-03-31 22:58:01,512 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-03-31 22:58:01,512 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 22 [2023-03-31 22:58:01,516 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 33 treesize of output 24 [2023-03-31 22:58:01,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:01,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2023-03-31 22:58:01,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:01,532 INFO L321 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2023-03-31 22:58:01,533 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 40 treesize of output 24 [2023-03-31 22:58:01,541 INFO L321 Elim1Store]: treesize reduction 41, result has 2.4 percent of original size [2023-03-31 22:58:01,541 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 45 treesize of output 1 [2023-03-31 22:58:01,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:01,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:01,552 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 1 [2023-03-31 22:58:01,895 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 22:58:01,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550323895] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:01,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [566818856] [2023-03-31 22:58:01,896 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-03-31 22:58:01,896 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:01,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:01,897 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:01,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:01,908 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:01,941 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-03-31 22:58:01,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:01,986 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:58:02,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1181#(and (exists ((|v_main_~#str2~0.base_BEFORE_CALL_4| Int) (|v_main_~#str1~0.base_BEFORE_CALL_4| Int)) (and (not (= (select (select |#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_4|) 4))) (<= 0 |v_main_~#str1~0.base_BEFORE_CALL_4|) (<= 0 |v_main_~#str2~0.base_BEFORE_CALL_4|))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:58:02,504 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:58:02,504 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:58:02,504 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 14] total 34 [2023-03-31 22:58:02,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750435620] [2023-03-31 22:58:02,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:58:02,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-03-31 22:58:02,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:02,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-03-31 22:58:02,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1727, Unknown=0, NotChecked=0, Total=1980 [2023-03-31 22:58:02,506 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 34 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 32 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:58:04,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:58:04,025 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2023-03-31 22:58:04,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-03-31 22:58:04,026 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 32 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-03-31 22:58:04,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:58:04,026 INFO L225 Difference]: With dead ends: 63 [2023-03-31 22:58:04,027 INFO L226 Difference]: Without dead ends: 46 [2023-03-31 22:58:04,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1050 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=638, Invalid=3652, Unknown=0, NotChecked=0, Total=4290 [2023-03-31 22:58:04,028 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 85 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 22:58:04,029 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 108 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 22:58:04,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-03-31 22:58:04,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 32. [2023-03-31 22:58:04,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 22:58:04,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2023-03-31 22:58:04,045 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 24 [2023-03-31 22:58:04,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:58:04,046 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2023-03-31 22:58:04,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 32 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 22:58:04,046 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2023-03-31 22:58:04,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-03-31 22:58:04,046 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:58:04,046 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:58:04,058 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-03-31 22:58:04,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:04,251 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:58:04,251 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:58:04,251 INFO L85 PathProgramCache]: Analyzing trace with hash 708645863, now seen corresponding path program 1 times [2023-03-31 22:58:04,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:58:04,252 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526973704] [2023-03-31 22:58:04,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:04,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:58:04,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:04,539 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-03-31 22:58:04,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:58:04,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526973704] [2023-03-31 22:58:04,539 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526973704] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:58:04,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638758895] [2023-03-31 22:58:04,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:58:04,539 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:58:04,539 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:58:04,544 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 22:58:04,576 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 22:58:04,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:58:04,614 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 56 conjunts are in the unsatisfiable core [2023-03-31 22:58:04,616 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:58:04,620 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 10 treesize of output 8 [2023-03-31 22:58:04,789 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 17 treesize of output 17 [2023-03-31 22:58:04,840 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 25 treesize of output 27 [2023-03-31 22:58:15,216 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:58:15,217 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:58:15,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 10 [2023-03-31 22:58:15,278 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 22:58:15,278 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:58:16,869 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:58:16,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 206 treesize of output 194 [2023-03-31 22:58:16,954 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-03-31 22:58:16,954 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 212 treesize of output 170 [2023-03-31 22:58:16,974 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-03-31 22:58:16,974 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 167 treesize of output 141 [2023-03-31 22:58:16,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:16,998 INFO L321 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2023-03-31 22:58:16,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 236 treesize of output 182 [2023-03-31 22:58:17,013 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:58:17,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,027 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:58:17,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 236 treesize of output 187 [2023-03-31 22:58:17,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,054 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-03-31 22:58:17,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 402 treesize of output 1 [2023-03-31 22:58:17,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,061 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 47 [2023-03-31 22:58:17,064 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:58:17,066 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 69 treesize of output 51 [2023-03-31 22:58:17,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,074 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2023-03-31 22:58:17,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,091 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:58:17,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 206 treesize of output 194 [2023-03-31 22:58:17,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,175 INFO L321 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2023-03-31 22:58:17,175 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 402 treesize of output 322 [2023-03-31 22:58:17,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,197 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-03-31 22:58:17,197 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 236 treesize of output 187 [2023-03-31 22:58:17,221 INFO L321 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2023-03-31 22:58:17,221 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 378 treesize of output 322 [2023-03-31 22:58:17,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,240 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-03-31 22:58:17,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 402 treesize of output 1 [2023-03-31 22:58:17,253 INFO L321 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-03-31 22:58:17,253 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 167 treesize of output 141 [2023-03-31 22:58:17,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,278 INFO L321 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2023-03-31 22:58:17,278 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 236 treesize of output 182 [2023-03-31 22:58:17,298 INFO L321 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2023-03-31 22:58:17,299 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 212 treesize of output 182 [2023-03-31 22:58:17,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,323 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2023-03-31 22:58:17,326 INFO L173 IndexEqualityManager]: detected equality via solver [2023-03-31 22:58:17,327 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 33 treesize of output 24 [2023-03-31 22:58:17,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,334 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 47 [2023-03-31 22:58:17,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,343 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 59 treesize of output 47 [2023-03-31 22:58:17,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:17,351 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 31 treesize of output 23 [2023-03-31 22:58:17,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:58:19,883 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 22:58:19,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638758895] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:58:19,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1814305942] [2023-03-31 22:58:19,885 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-03-31 22:58:19,885 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:58:19,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:58:19,885 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:58:19,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:58:19,897 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 17 for LOIs [2023-03-31 22:58:20,023 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 22:58:20,028 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-03-31 22:58:20,031 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 22:58:20,779 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1587#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 22:58:20,779 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 22:58:20,779 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-03-31 22:58:20,779 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 16, 13] total 32 [2023-03-31 22:58:20,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289516419] [2023-03-31 22:58:20,780 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-03-31 22:58:20,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-03-31 22:58:20,780 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:58:20,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-03-31 22:58:20,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1706, Unknown=7, NotChecked=0, Total=1892 [2023-03-31 22:58:20,781 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 32 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:58:24,972 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:29,030 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:33,089 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:37,140 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:39,252 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:41,261 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:43,352 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:45,441 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:47,508 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:49,600 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:58:51,957 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2023-03-31 22:58:56,547 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2023-03-31 22:58:58,600 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2023-03-31 22:59:02,334 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-03-31 22:59:02,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:59:02,445 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2023-03-31 22:59:02,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-03-31 22:59:02,446 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 28 [2023-03-31 22:59:02,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:59:02,446 INFO L225 Difference]: With dead ends: 61 [2023-03-31 22:59:02,446 INFO L226 Difference]: Without dead ends: 46 [2023-03-31 22:59:02,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 716 ImplicationChecksByTransitivity, 29.0s TimeCoverageRelationStatistics Valid=409, Invalid=3118, Unknown=13, NotChecked=0, Total=3540 [2023-03-31 22:59:02,448 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 69 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 395 mSolverCounterSat, 96 mSolverCounterUnsat, 14 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 395 IncrementalHoareTripleChecker+Invalid, 14 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.6s IncrementalHoareTripleChecker+Time [2023-03-31 22:59:02,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 211 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 395 Invalid, 14 Unknown, 0 Unchecked, 27.6s Time] [2023-03-31 22:59:02,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-03-31 22:59:02,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 39. [2023-03-31 22:59:02,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 30 states have internal predecessors, (31), 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 22:59:02,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2023-03-31 22:59:02,463 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 28 [2023-03-31 22:59:02,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:59:02,463 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2023-03-31 22:59:02,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 29 states have internal predecessors, (46), 5 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-03-31 22:59:02,463 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2023-03-31 22:59:02,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-03-31 22:59:02,464 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:59:02,464 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:59:02,484 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 22:59:02,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:59:02,669 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:59:02,669 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:59:02,669 INFO L85 PathProgramCache]: Analyzing trace with hash 980134804, now seen corresponding path program 2 times [2023-03-31 22:59:02,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:59:02,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330136982] [2023-03-31 22:59:02,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:59:02,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:59:02,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:59:03,723 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 27 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-03-31 22:59:03,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:59:03,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330136982] [2023-03-31 22:59:03,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330136982] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:59:03,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244994637] [2023-03-31 22:59:03,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 22:59:03,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:59:03,724 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:59:03,725 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 22:59:03,727 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 22:59:03,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-03-31 22:59:03,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 22:59:03,929 INFO L262 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 81 conjunts are in the unsatisfiable core [2023-03-31 22:59:03,932 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:59:03,942 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 10 treesize of output 8 [2023-03-31 22:59:04,155 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 15 treesize of output 15 [2023-03-31 22:59:04,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:59:04,198 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 23 treesize of output 25 [2023-03-31 22:59:04,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-03-31 22:59:04,240 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 23 treesize of output 25